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2014/10/15 ¤U¤È 10:12:22
iphone Programming Glossary: orHow to check for an active Internet Connection on iPhone SDK? http://stackoverflow.com/questions/1083701/how-to-check-for-an-active-internet-connection-on-iphone-sdk to check for an active Internet Connection on iPhone SDK I would like to check to see if I have an Internet connection.. Google could one day be down and relying on a 3rd party seems bad and while I could check to see for a response from some other websites if Google didn't respond it does seem wasteful and an unnecessary.. METHOD 1 Use a simple ARC and GCD compatible class to do it 1 Add SystemConfiguration framework to the project but don't worry about including it anywhere 2 Add Tony Million's version of Reachability.h..
How to make a UITextField move up when keyboard is present http://stackoverflow.com/questions/1126726/how-to-make-a-uitextfield-move-up-when-keyboard-is-present to see the other text fields once the keyboard is brought up Automatically jump by scrolling up or shortening I know that I need a UIScrollView . I've tried changing the class of my UIView to a UIScrollView.. see the other text fields once the keyboard is brought up Automatically jump by scrolling up or shortening I know that I need a UIScrollView . I've tried changing the class of my UIView to a UIScrollView.. changing the class of my UIView to a UIScrollView but I'm still unable to scroll the textboxes up or down. Do I need both a UIView and a UIScrollView Does one go inside the other EDIT I now know that you..
How to develop or migrate apps for iPhone 5 screen resolution? http://stackoverflow.com/questions/12395200/how-to-develop-or-migrate-apps-for-iphone-5-screen-resolution to develop or migrate apps for iPhone 5 screen resolution The new iPhone 5 display has a new aspect ratio and a new.. to develop or migrate apps for iPhone 5 screen resolution The new iPhone 5 display has a new aspect ratio and a new resolution 640.. has a new aspect ratio and a new resolution 640 x 1136 pixels . What is required to develop new or transition already existing applications to the new screen size What should we keep in mind to make..
Can I embed a custom font in an iPhone application? http://stackoverflow.com/questions/360751/can-i-embed-a-custom-font-in-an-iphone-application I embed a custom font in an iPhone application I would like to have an app include a custom font for rendering text load it and then use it with standard UIKit elements like UILabel. Is this possible I.. this possible I found these links http discussions.apple.com thread.jspa messageID 8304744 http forums.macrumors.com showthread.php t 569311 but these would require me to render each glyph myself which.. I found these links http discussions.apple.com thread.jspa messageID 8304744 http forums.macrumors.com showthread.php t 569311 but these would require me to render each glyph myself which is a bit too..
How do I do base64 encoding on iphone-sdk? http://stackoverflow.com/questions/392464/how-do-i-do-base64-encoding-on-iphone-sdk encoding on iphone sdk I'd like to do base64 encoding and decoding but I could not find any support from the iPhone SDK. How can I do base64 encoding and decoding with or without a library iphone objective.. I could not find any support from the iPhone SDK. How can I do base64 encoding and decoding with or without a library iphone objective c ios ipad base64 share improve this question There's a nice..
How do I create delegates in Objective-C? http://stackoverflow.com/questions/626898/how-do-i-create-delegates-in-objective-c do I create delegates in Objective C I know how delegates work and I know how I can use them. But how do I create them iphone ios objective c cocoa delegates share.. is just an object that has been assigned as a delegate of another. There's no special process for creating them you simply define a class that implements the delegate methods you're interested in. Though.. class that implements the delegate methods you're interested in. Though with delegates that use a formal protocol you must declare your delegate to implement that protocol see below. For example suppose..
UIDevice uniqueIdentifier Deprecated - What To Do Now? http://stackoverflow.com/questions/6993325/uidevice-uniqueidentifier-deprecated-what-to-do-now the UIDevice uniqueIdentifier property is deprecated in iOS 5 and above. No alternative method or property appears to be available or forthcoming. Many of our existing apps are tightly dependent on.. is deprecated in iOS 5 and above. No alternative method or property appears to be available or forthcoming. Many of our existing apps are tightly dependent on this property for uniquely identifying.. is deprecated in iOS 5 and above. No alternative method or property appears to be available or forthcoming. Many of our existing apps are tightly dependent on this property for uniquely identifying a..
Retrieving a pixel alpha value for a UIImage http://stackoverflow.com/questions/1042830/retrieving-a-pixel-alpha-value-for-a-uiimage width height bitsPerComponent bytesPerRow colorSpace kCGImageAlphaPremultipliedLast kCGBitmapByteOrder32Big CGColorSpaceRelease colorSpace CGContextDrawImage context CGRectMake 0 0 width height image.. Do I need to translate the co ordinates between UIKit and Core Graphics i.e is the y axis inverted Or have I misunderstood premultiplied alpha values Update @Nikolai Ruhe's suggestion was key to this. I..
Programmatically turn on bluetooth in the iphone sdk? http://stackoverflow.com/questions/1743610/programmatically-turn-on-bluetooth-in-the-iphone-sdk this if the header file was already in the framework #import BluetoothManager BluetoothManager.h Or this if you added your own BluetoothManager.h file to your project #import BluetoothManager.h To toggle..
The simplest way to resize an UIImage? http://stackoverflow.com/questions/2658738/the-simplest-way-to-resize-an-uiimage is to set the frame of your UIImageView and set the contentMode to one of the resizing options. Or you can use this utility method if you actually need to resize an image UIImage imageWithImage UIImage..
How to tell if UIViewController's view is visible http://stackoverflow.com/questions/2777438/how-to-tell-if-uiviewcontrollers-view-is-visible this problem. if viewController.isViewLoaded viewController.view.window viewController is visible Or if you have a UINavigationController managing the view controllers you could check its visibleViewController..
How to do a natural sort on an NSArray? http://stackoverflow.com/questions/2846301/how-to-do-a-natural-sort-on-an-nsarray compare b title options NSNumericSearch result array sortedArrayUsingFunction sort context nil Or a bit more generic NSInteger sort id a id b void p return a valueForKey NSString p compare b valueForKey.. NSString p options NSNumericSearch result array sortedArrayUsingFunction sort context @ title Or using blocks result array sortedArrayUsingComparator ^ Obj a Obj b return a title compare b title options..
How do I export UIImage array as a movie? http://stackoverflow.com/questions/3741323/how-do-i-export-uiimage-array-as-a-movie a session videoWriter startWriting videoWriter startSessionAtSourceTime ¦] 3 Write some samples Or you can use AVAssetWriterInputPixelBufferAdaptor. That lets you feed the writer input data from a CVPixelBuffer..
How to build a framework or library for other developers, the secure way? http://stackoverflow.com/questions/4065052/how-to-build-a-framework-or-library-for-other-developers-the-secure-way They only ship the header files and some weird Unix exe file with the compiled framework I guess. Or if it is not possible to make an compiled framework library that other iOS developers can use without..
Want to display a 3D model on the iPhone: how to get started? http://stackoverflow.com/questions/413919/want-to-display-a-3d-model-on-the-iphone-how-to-get-started to start I couldn't find any tutorials for this sort of thing but maybe my Google Fu is weak. Or maybe I should start with learning Objective C I know of books like Aaron Hillgrass' but I've also read..
How to send json data in the Http request using NSURLRequest http://stackoverflow.com/questions/4456966/how-to-send-json-data-in-the-http-request-using-nsurlrequest alloc initWithRequest request delegate self My first question is will this approach scale up Or is this not async meaning I block the UI thread while the app is waiting for the response My second..
UIImagePickerController camera preview is portrait in landscape app http://stackoverflow.com/questions/538041/uiimagepickercontroller-camera-preview-is-portrait-in-landscape-app thread.jspa messageID 7949889 UIImage scaleAndRotateImage UIImage image int kMaxResolution 640 Or whatever CGImageRef imgRef image.CGImage CGFloat width CGImageGetWidth imgRef CGFloat height CGImageGetHeight.. imageSize CGSizeMake CGImageGetWidth imgRef CGImageGetHeight imgRef CGFloat boundHeight UIImageOrientation orient image.imageOrientation switch orient case UIImageOrientationUp EXIF 1 transform CGAffineTransformIdentity.. imgRef CGImageGetHeight imgRef CGFloat boundHeight UIImageOrientation orient image.imageOrientation switch orient case UIImageOrientationUp EXIF 1 transform CGAffineTransformIdentity break case..
http://stackoverflow.com/questions/554997/cancel-a-uiview-animation a UIView animation Is it possible to cancel a UIView animation while it is in progress Or would I have to drop to the CA level i.e. I've done something like this maybe setting an end animation..
OpenGL Texture Coordinates in Pixel Space http://stackoverflow.com/questions/5879403/opengl-texture-coordinates-in-pixel-space you're interested in the texture coordinates 0 8 1 8 2 1 2 8 1 8 2 8 2 3 2 8 ... 7 8 8 8 2 15 2 8 Or more generally for pixel i in a N wide texture the proper texture coordinate is 2i 1 2N However if you..
Understanding reference counting with Cocoa and Objective-C http://stackoverflow.com/questions/6578/understanding-reference-counting-with-cocoa-and-objective-c hump yet. How do release retain and autorelease work and what are the conventions about their use Or failing that what did you read which helped you get it iphone objective c cocoa memory share improve..
iOS: How to store username/password within an app? http://stackoverflow.com/questions/6972092/ios-how-to-store-username-password-within-an-app
performSelector may cause a leak because its selector is unknown http://stackoverflow.com/questions/7017281/performselector-may-cause-a-leak-because-its-selector-is-unknown IMP imp _controller methodForSelector selector void func id SEL void imp func _controller selector Or more tersely though hard to read SEL selector NSSelectorFromString @ someMethod void id SEL _controller..
iCloud basics and code sample [closed] http://stackoverflow.com/questions/7795629/icloud-basics-and-code-sample will happen. How will I make it possible that non iCloud users can still work with my text app Or do I simply ignore them Would I need to write separate functions for non iCloud users I.e. functions.. your app sandbox. However in my case there is no 'normal' app sandbox anymore. It's in the cloud. Or do I always load my text.txt from disk first and then check with iCloud if there is something more up..
http://stackoverflow.com/questions/8088473/url-encode-an-nsstring thisChar return output Used like this NSString urlEncodedString @ SOME_URL_GOES_HERE urlencode Or with an already existing string NSString someUrlString @ someURL NSString encodedUrlStr someUrlString..
View Controllers: How to switch between views programmatically? http://stackoverflow.com/questions/910994/view-controllers-how-to-switch-between-views-programmatically or viewDidLoad I believe that the Tab Bar Controller has all this cleverness under the hood. Or am I wrong UPDATE I've tested it. If I release the view controller for example ViewControllerA I will..
how to create iphone's wobbling icon effect? http://stackoverflow.com/questions/929364/how-to-create-iphones-wobbling-icon-effect arrayWithObjects initial middle final nil imageView.layer addAnimation animation forKey keypath Or there could be a totally simpler solution that I'm just missing. Appreciate any pointers. Thanks iphone..
How to check for an active Internet Connection on iPhone SDK? http://stackoverflow.com/questions/1083701/how-to-check-for-an-active-internet-connection-on-iphone-sdk to check for an active Internet Connection on iPhone SDK I would like to check to see if I have an Internet connection on the iPhone using the Cocoa Touch libraries. I came.. NSURL . The way I did it seems a bit unreliable because even Google could one day be down and relying on a 3rd party seems bad and while I could check to see for a response from some other websites if Google didn't respond it does seem wasteful and an unnecessary overhead on my application. BOOL connectedToInternet NSString.. c ios cocoa touch reachability share improve this question METHOD 1 Use a simple ARC and GCD compatible class to do it 1 Add SystemConfiguration framework to the project but don't worry about including it anywhere 2 Add Tony Million's version of Reachability.h and Reachability.m to the project found here https github.com..
How to make a UITextField move up when keyboard is present http://stackoverflow.com/questions/1126726/how-to-make-a-uitextfield-move-up-when-keyboard-is-present be able to Allow scrolling of the contents of the UIScrollView to see the other text fields once the keyboard is brought up Automatically jump by scrolling up or shortening I know that I need a UIScrollView . I've tried changing the class of my UIView to a UIScrollView but I'm still unable to scroll the textboxes up or down... to Allow scrolling of the contents of the UIScrollView to see the other text fields once the keyboard is brought up Automatically jump by scrolling up or shortening I know that I need a UIScrollView . I've tried changing the class of my UIView to a UIScrollView but I'm still unable to scroll the textboxes up or down... or shortening I know that I need a UIScrollView . I've tried changing the class of my UIView to a UIScrollView but I'm still unable to scroll the textboxes up or down. Do I need both a UIView and a UIScrollView Does one go inside the other EDIT I now know that you want a UIView inside of a UIScrollView and the trick is to..
How to develop or migrate apps for iPhone 5 screen resolution? http://stackoverflow.com/questions/12395200/how-to-develop-or-migrate-apps-for-iphone-5-screen-resolution to develop or migrate apps for iPhone 5 screen resolution The new iPhone 5 display has a new aspect ratio and a new resolution 640 x 1136 pixels . What is required to develop.. to develop or migrate apps for iPhone 5 screen resolution The new iPhone 5 display has a new aspect ratio and a new resolution 640 x 1136 pixels . What is required to develop new or transition.. apps for iPhone 5 screen resolution The new iPhone 5 display has a new aspect ratio and a new resolution 640 x 1136 pixels . What is required to develop new or transition already existing applications to the new screen size What should we keep in mind to make applications universal for both the older displays and the new..
Can I embed a custom font in an iPhone application? http://stackoverflow.com/questions/360751/can-i-embed-a-custom-font-in-an-iphone-application I embed a custom font in an iPhone application I would like to have an app include a custom font for rendering text load it and then use it with standard UIKit elements like UILabel. Is this possible I found these links http discussions.apple.com thread.jspa messageID.. and then use it with standard UIKit elements like UILabel. Is this possible I found these links http discussions.apple.com thread.jspa messageID 8304744 http forums.macrumors.com showthread.php t 569311 but these would require me to render each glyph myself which is a bit too much like hard work especially for multi line.. it with standard UIKit elements like UILabel. Is this possible I found these links http discussions.apple.com thread.jspa messageID 8304744 http forums.macrumors.com showthread.php t 569311 but these would require me to render each glyph myself which is a bit too much like hard work especially for multi line text. I've..
How do I do base64 encoding on iphone-sdk? http://stackoverflow.com/questions/392464/how-do-i-do-base64-encoding-on-iphone-sdk do I do base64 encoding on iphone sdk I'd like to do base64 encoding and decoding but I could not find any support from the iPhone SDK. How can I do base64 encoding and decoding with or without a library iphone objective c ios ipad base64 share improve this question There's.. iphone sdk I'd like to do base64 encoding and decoding but I could not find any support from the iPhone SDK. How can I do base64 encoding and decoding with or without a library iphone objective c ios ipad base64 share improve this question There's a nice code sample at the bottom of this post. Very self contained.....
How do I create delegates in Objective-C? http://stackoverflow.com/questions/626898/how-do-i-create-delegates-in-objective-c do I create delegates in Objective C I know how delegates work and I know how I can use them. But how do I create them iphone ios objective c cocoa delegates share improve this question An Objective C delegate is just.. share improve this question An Objective C delegate is just an object that has been assigned as a delegate of another. There's no special process for creating them you simply define a class that implements the delegate methods you're interested in. Though with delegates that use a formal protocol you must declare.. no special process for creating them you simply define a class that implements the delegate methods you're interested in. Though with delegates that use a formal protocol you must declare your delegate to implement that protocol see below. For example suppose you have an NSWindow. If you'd like to implement its delegate's..
UIDevice uniqueIdentifier Deprecated - What To Do Now? http://stackoverflow.com/questions/6993325/uidevice-uniqueidentifier-deprecated-what-to-do-now Deprecated What To Do Now It has just come to light that the UIDevice uniqueIdentifier property is deprecated in iOS 5 and above. No alternative method or property appears to be available or forthcoming. Many of our existing apps are tightly dependent on this property for uniquely identifying a particular device... has just come to light that the UIDevice uniqueIdentifier property is deprecated in iOS 5 and above. No alternative method or property appears to be available or forthcoming. Many of our existing apps are tightly dependent on this property for uniquely identifying a particular device. Can anyone suggest any ideas how we.. just come to light that the UIDevice uniqueIdentifier property is deprecated in iOS 5 and above. No alternative method or property appears to be available or forthcoming. Many of our existing apps are tightly dependent on this property for uniquely identifying a particular device. Can anyone suggest any ideas how we might..
Retrieving a pixel alpha value for a UIImage http://stackoverflow.com/questions/1042830/retrieving-a-pixel-alpha-value-for-a-uiimage 8 CGContextRef context CGBitmapContextCreate rawData width height bitsPerComponent bytesPerRow colorSpace kCGImageAlphaPremultipliedLast kCGBitmapByteOrder32Big CGColorSpaceRelease colorSpace CGContextDrawImage context CGRectMake 0 0 width height image CGContextRelease context I then calculate the array index for.. of the image I get non zero values for the alpha channel. Do I need to translate the co ordinates between UIKit and Core Graphics i.e is the y axis inverted Or have I misunderstood premultiplied alpha values Update @Nikolai Ruhe's suggestion was key to this. I did not in fact need to translate between UIKit coordinates..
Programmatically turn on bluetooth in the iphone sdk? http://stackoverflow.com/questions/1743610/programmatically-turn-on-bluetooth-in-the-iphone-sdk that is added to your project your import should look like this if the header file was already in the framework #import BluetoothManager BluetoothManager.h Or this if you added your own BluetoothManager.h file to your project #import BluetoothManager.h To toggle the bluetooth here is the code BluetoothManager manager..
The simplest way to resize an UIImage? http://stackoverflow.com/questions/2658738/the-simplest-way-to-resize-an-uiimage uiimage share improve this question The simplest way is to set the frame of your UIImageView and set the contentMode to one of the resizing options. Or you can use this utility method if you actually need to resize an image UIImage imageWithImage UIImage image scaledToSize CGSize newSize UIGraphicsBeginImageContext..
How to tell if UIViewController's view is visible http://stackoverflow.com/questions/2777438/how-to-tell-if-uiviewcontrollers-view-is-visible
How to do a natural sort on an NSArray? http://stackoverflow.com/questions/2846301/how-to-do-a-natural-sort-on-an-nsarray One version NSInteger sort Obj a Obj b void return a title compare b title options NSNumericSearch result array sortedArrayUsingFunction sort context nil Or a bit more generic NSInteger sort id a id b void p return a valueForKey NSString p compare b valueForKey NSString p options NSNumericSearch result array sortedArrayUsingFunction..
How do I export UIImage array as a movie? http://stackoverflow.com/questions/3741323/how-do-i-export-uiimage-array-as-a-movie writerInput videoWriter addInput writerInput 2 Start a session videoWriter startWriting videoWriter startSessionAtSourceTime ¦] 3 Write some samples Or you can use AVAssetWriterInputPixelBufferAdaptor. That lets you feed the writer input data from a CVPixelBuffer that ™s quite easy to create from a CGImage. writerInput..
How to build a framework or library for other developers, the secure way? http://stackoverflow.com/questions/4065052/how-to-build-a-framework-or-library-for-other-developers-the-secure-way to how we can't see the source code of Apples frameworks They only ship the header files and some weird Unix exe file with the compiled framework I guess. Or if it is not possible to make an compiled framework library that other iOS developers can use without beeing able to copy paste our source codes then is there a..
Want to display a 3D model on the iPhone: how to get started? http://stackoverflow.com/questions/413919/want-to-display-a-3d-model-on-the-iphone-how-to-get-started I have to do manual memory management. Where is the best place to start I couldn't find any tutorials for this sort of thing but maybe my Google Fu is weak. Or maybe I should start with learning Objective C I know of books like Aaron Hillgrass' but I've also read that they are outdated and much of the sample code doesn't..
How to send json data in the Http request using NSURLRequest http://stackoverflow.com/questions/4456966/how-to-send-json-data-in-the-http-request-using-nsurlrequest NSURL URLWithString @ http www.whatever.com json NSURLConnection alloc initWithRequest request delegate self My first question is will this approach scale up Or is this not async meaning I block the UI thread while the app is waiting for the response My second question is how might I modify the request part of this to do..
UIImagePickerController camera preview is portrait in landscape app http://stackoverflow.com/questions/538041/uiimagepickercontroller-camera-preview-is-portrait-in-landscape-app into a method like this Code from http discussions.apple.com thread.jspa messageID 7949889 UIImage scaleAndRotateImage UIImage image int kMaxResolution 640 Or whatever CGImageRef imgRef image.CGImage CGFloat width CGImageGetWidth imgRef CGFloat height CGImageGetHeight imgRef CGAffineTransform transform CGAffineTransformIdentity.. ratio CGFloat scaleRatio bounds.size.width width CGSize imageSize CGSizeMake CGImageGetWidth imgRef CGImageGetHeight imgRef CGFloat boundHeight UIImageOrientation orient image.imageOrientation switch orient case UIImageOrientationUp EXIF 1 transform CGAffineTransformIdentity break case UIImageOrientationUpMirrored.. bounds.size.width width CGSize imageSize CGSizeMake CGImageGetWidth imgRef CGImageGetHeight imgRef CGFloat boundHeight UIImageOrientation orient image.imageOrientation switch orient case UIImageOrientationUp EXIF 1 transform CGAffineTransformIdentity break case UIImageOrientationUpMirrored EXIF 2 transform CGAffineTransformMakeTranslation..
http://stackoverflow.com/questions/554997/cancel-a-uiview-animation a UIView animation Is it possible to cancel a UIView animation while it is in progress Or would I have to drop to the CA level i.e. I've done something like this maybe setting an end animation action too UIView beginAnimations nil context NULL UIView..
OpenGL Texture Coordinates in Pixel Space http://stackoverflow.com/questions/5879403/opengl-texture-coordinates-in-pixel-space pixels. You however want to hit the pixels' centers. So you're interested in the texture coordinates 0 8 1 8 2 1 2 8 1 8 2 8 2 3 2 8 ... 7 8 8 8 2 15 2 8 Or more generally for pixel i in a N wide texture the proper texture coordinate is 2i 1 2N However if you want to perfectly align your texture with the screen pixels..
Understanding reference counting with Cocoa and Objective-C http://stackoverflow.com/questions/6578/understanding-reference-counting-with-cocoa-and-objective-c elegant once you understand it but I'm just not over the hump yet. How do release retain and autorelease work and what are the conventions about their use Or failing that what did you read which helped you get it iphone objective c cocoa memory share improve this question Let's start with retain and release autorelease..
iOS: How to store username/password within an app? http://stackoverflow.com/questions/6972092/ios-how-to-store-username-password-within-an-app
performSelector may cause a leak because its selector is unknown http://stackoverflow.com/questions/7017281/performselector-may-cause-a-leak-because-its-selector-is-unknown Here's how SEL selector NSSelectorFromString @ someMethod IMP imp _controller methodForSelector selector void func id SEL void imp func _controller selector Or more tersely though hard to read SEL selector NSSelectorFromString @ someMethod void id SEL _controller methodForSelector selector _controller selector Explanation..
iCloud basics and code sample [closed] http://stackoverflow.com/questions/7795629/icloud-basics-and-code-sample to the user. If the user does not have iCloud enabled nothing will happen. How will I make it possible that non iCloud users can still work with my text app Or do I simply ignore them Would I need to write separate functions for non iCloud users I.e. functions in which I simply load a text.txt from the documents folder.. files in iCloud the same way you treat all other files in your app sandbox. However in my case there is no 'normal' app sandbox anymore. It's in the cloud. Or do I always load my text.txt from disk first and then check with iCloud if there is something more up to date Related problem File structure Sandbox vs. Cloud Perhaps..
http://stackoverflow.com/questions/8088473/url-encode-an-nsstring appendFormat @ c thisChar else output appendFormat @ 02X thisChar return output Used like this NSString urlEncodedString @ SOME_URL_GOES_HERE urlencode Or with an already existing string NSString someUrlString @ someURL NSString encodedUrlStr someUrlString urlencode This also works NSString encodedString NSString..
View Controllers: How to switch between views programmatically? http://stackoverflow.com/questions/910994/view-controllers-how-to-switch-between-views-programmatically methods How does it know that viewWillAppear viewDidDisappear or viewDidLoad I believe that the Tab Bar Controller has all this cleverness under the hood. Or am I wrong UPDATE I've tested it. If I release the view controller for example ViewControllerA I will get no log message on viewDidDisappear. Only when allocating..
how to create iphone's wobbling icon effect? http://stackoverflow.com/questions/929364/how-to-create-iphones-wobbling-icon-effect wobbleAngle 0.0f 0.0f 1.0f animation.values NSArray arrayWithObjects initial middle final nil imageView.layer addAnimation animation forKey keypath Or there could be a totally simpler solution that I'm just missing. Appreciate any pointers. Thanks iphone ios animation rotation share improve this question ..
How to check for an active Internet Connection on iPhone SDK? http://stackoverflow.com/questions/1083701/how-to-check-for-an-active-internet-connection-on-iphone-sdk to check for an active Internet Connection on iPhone SDK I would like to check to see if I have an Internet connection on the iPhone.. because even Google could one day be down and relying on a 3rd party seems bad and while I could check to see for a response from some other websites if Google didn't respond it does seem wasteful and an unnecessary overhead on my application... improve this question METHOD 1 Use a simple ARC and GCD compatible class to do it 1 Add SystemConfiguration framework to the project but don't worry about including it anywhere 2 Add Tony Million's version of Reachability.h and Reachability.m..
How to make a UITextField move up when keyboard is present http://stackoverflow.com/questions/1126726/how-to-make-a-uitextfield-move-up-when-keyboard-is-present of the UIScrollView to see the other text fields once the keyboard is brought up Automatically jump by scrolling up or shortening I know that I need a UIScrollView . I've tried changing the class of my UIView to a UIScrollView but I'm still.. the UIScrollView to see the other text fields once the keyboard is brought up Automatically jump by scrolling up or shortening I know that I need a UIScrollView . I've tried changing the class of my UIView to a UIScrollView but I'm still unable.. . I've tried changing the class of my UIView to a UIScrollView but I'm still unable to scroll the textboxes up or down. Do I need both a UIView and a UIScrollView Does one go inside the other EDIT I now know that you want a UIView inside..
How to develop or migrate apps for iPhone 5 screen resolution? http://stackoverflow.com/questions/12395200/how-to-develop-or-migrate-apps-for-iphone-5-screen-resolution to develop or migrate apps for iPhone 5 screen resolution The new iPhone 5 display has a new aspect ratio and a new resolution 640 x.. to develop or migrate apps for iPhone 5 screen resolution The new iPhone 5 display has a new aspect ratio and a new resolution 640 x 1136 pixels . What.. new iPhone 5 display has a new aspect ratio and a new resolution 640 x 1136 pixels . What is required to develop new or transition already existing applications to the new screen size What should we keep in mind to make applications universal..
Can I embed a custom font in an iPhone application? http://stackoverflow.com/questions/360751/can-i-embed-a-custom-font-in-an-iphone-application I embed a custom font in an iPhone application I would like to have an app include a custom font for rendering text load it and then use it with standard UIKit elements like UILabel. Is this possible I found these links http.. like UILabel. Is this possible I found these links http discussions.apple.com thread.jspa messageID 8304744 http forums.macrumors.com showthread.php t 569311 but these would require me to render each glyph myself which is a bit too much.. Is this possible I found these links http discussions.apple.com thread.jspa messageID 8304744 http forums.macrumors.com showthread.php t 569311 but these would require me to render each glyph myself which is a bit too much like hard work..
How do I do base64 encoding on iphone-sdk? http://stackoverflow.com/questions/392464/how-do-i-do-base64-encoding-on-iphone-sdk do I do base64 encoding on iphone sdk I'd like to do base64 encoding and decoding but I could not find any support from the iPhone SDK. How can I do base64 encoding and decoding with or without a library iphone objective c ios ipad base64.. and decoding but I could not find any support from the iPhone SDK. How can I do base64 encoding and decoding with or without a library iphone objective c ios ipad base64 share improve this question There's a nice code sample at the..
How do I create delegates in Objective-C? http://stackoverflow.com/questions/626898/how-do-i-create-delegates-in-objective-c do I create delegates in Objective C I know how delegates work and I know how I can use them. But how do I create them iphone ios objective c cocoa delegates share improve this question.. An Objective C delegate is just an object that has been assigned as a delegate of another. There's no special process for creating them you simply define a class that implements the delegate methods you're interested in. Though with delegates.. you simply define a class that implements the delegate methods you're interested in. Though with delegates that use a formal protocol you must declare your delegate to implement that protocol see below. For example suppose you have an NSWindow...
UIDevice uniqueIdentifier Deprecated - What To Do Now? http://stackoverflow.com/questions/6993325/uidevice-uniqueidentifier-deprecated-what-to-do-now just come to light that the UIDevice uniqueIdentifier property is deprecated in iOS 5 and above. No alternative method or property appears to be available or forthcoming. Many of our existing apps are tightly dependent on this property for uniquely.. uniqueIdentifier property is deprecated in iOS 5 and above. No alternative method or property appears to be available or forthcoming. Many of our existing apps are tightly dependent on this property for uniquely identifying a particular device... property is deprecated in iOS 5 and above. No alternative method or property appears to be available or forthcoming. Many of our existing apps are tightly dependent on this property for uniquely identifying a particular device...
Retrieving a pixel alpha value for a UIImage http://stackoverflow.com/questions/1042830/retrieving-a-pixel-alpha-value-for-a-uiimage rawData width height bitsPerComponent bytesPerRow colorSpace kCGImageAlphaPremultipliedLast kCGBitmapByteOrder32Big CGColorSpaceRelease colorSpace CGContextDrawImage context CGRectMake 0 0 width height image CGContextRelease context.. the alpha channel. Do I need to translate the co ordinates between UIKit and Core Graphics i.e is the y axis inverted Or have I misunderstood premultiplied alpha values Update @Nikolai Ruhe's suggestion was key to this. I did not in fact need..
Programmatically turn on bluetooth in the iphone sdk? http://stackoverflow.com/questions/1743610/programmatically-turn-on-bluetooth-in-the-iphone-sdk should look like this if the header file was already in the framework #import BluetoothManager BluetoothManager.h Or this if you added your own BluetoothManager.h file to your project #import BluetoothManager.h To toggle the bluetooth here..
The simplest way to resize an UIImage? http://stackoverflow.com/questions/2658738/the-simplest-way-to-resize-an-uiimage The simplest way is to set the frame of your UIImageView and set the contentMode to one of the resizing options. Or you can use this utility method if you actually need to resize an image UIImage imageWithImage UIImage image scaledToSize..
How to tell if UIViewController's view is visible http://stackoverflow.com/questions/2777438/how-to-tell-if-uiviewcontrollers-view-is-visible to avoid this problem. if viewController.isViewLoaded viewController.view.window viewController is visible Or if you have a UINavigationController managing the view controllers you could check its visibleViewController property instead...
How do I export UIImage array as a movie? http://stackoverflow.com/questions/3741323/how-do-i-export-uiimage-array-as-a-movie writerInput 2 Start a session videoWriter startWriting videoWriter startSessionAtSourceTime ¦] 3 Write some samples Or you can use AVAssetWriterInputPixelBufferAdaptor. That lets you feed the writer input data from a CVPixelBuffer that ™s quite..
How to build a framework or library for other developers, the secure way? http://stackoverflow.com/questions/4065052/how-to-build-a-framework-or-library-for-other-developers-the-secure-way of Apples frameworks They only ship the header files and some weird Unix exe file with the compiled framework I guess. Or if it is not possible to make an compiled framework library that other iOS developers can use without beeing able to copy..
Want to display a 3D model on the iPhone: how to get started? http://stackoverflow.com/questions/413919/want-to-display-a-3d-model-on-the-iphone-how-to-get-started Where is the best place to start I couldn't find any tutorials for this sort of thing but maybe my Google Fu is weak. Or maybe I should start with learning Objective C I know of books like Aaron Hillgrass' but I've also read that they are outdated..
How to send json data in the Http request using NSURLRequest http://stackoverflow.com/questions/4456966/how-to-send-json-data-in-the-http-request-using-nsurlrequest json NSURLConnection alloc initWithRequest request delegate self My first question is will this approach scale up Or is this not async meaning I block the UI thread while the app is waiting for the response My second question is how might..
UIImagePickerController camera preview is portrait in landscape app http://stackoverflow.com/questions/538041/uiimagepickercontroller-camera-preview-is-portrait-in-landscape-app discussions.apple.com thread.jspa messageID 7949889 UIImage scaleAndRotateImage UIImage image int kMaxResolution 640 Or whatever CGImageRef imgRef image.CGImage CGFloat width CGImageGetWidth imgRef CGFloat height CGImageGetHeight imgRef CGAffineTransform.. width CGSize imageSize CGSizeMake CGImageGetWidth imgRef CGImageGetHeight imgRef CGFloat boundHeight UIImageOrientation orient image.imageOrientation switch orient case UIImageOrientationUp EXIF 1 transform CGAffineTransformIdentity.. CGSizeMake CGImageGetWidth imgRef CGImageGetHeight imgRef CGFloat boundHeight UIImageOrientation orient image.imageOrientation switch orient case UIImageOrientationUp EXIF 1 transform CGAffineTransformIdentity break case UIImageOrientationUpMirrored..
http://stackoverflow.com/questions/554997/cancel-a-uiview-animation a UIView animation Is it possible to cancel a UIView animation while it is in progress Or would I have to drop to the CA level i.e. I've done something like this maybe setting an end animation action too UIView..
OpenGL Texture Coordinates in Pixel Space http://stackoverflow.com/questions/5879403/opengl-texture-coordinates-in-pixel-space pixels' centers. So you're interested in the texture coordinates 0 8 1 8 2 1 2 8 1 8 2 8 2 3 2 8 ... 7 8 8 8 2 15 2 8 Or more generally for pixel i in a N wide texture the proper texture coordinate is 2i 1 2N However if you want to perfectly..
Understanding reference counting with Cocoa and Objective-C http://stackoverflow.com/questions/6578/understanding-reference-counting-with-cocoa-and-objective-c just not over the hump yet. How do release retain and autorelease work and what are the conventions about their use Or failing that what did you read which helped you get it iphone objective c cocoa memory share improve this question ..
iOS: How to store username/password within an app? http://stackoverflow.com/questions/6972092/ios-how-to-store-username-password-within-an-app
performSelector may cause a leak because its selector is unknown http://stackoverflow.com/questions/7017281/performselector-may-cause-a-leak-because-its-selector-is-unknown @ someMethod IMP imp _controller methodForSelector selector void func id SEL void imp func _controller selector Or more tersely though hard to read SEL selector NSSelectorFromString @ someMethod void id SEL _controller methodForSelector..
iCloud basics and code sample [closed] http://stackoverflow.com/questions/7795629/icloud-basics-and-code-sample iCloud enabled nothing will happen. How will I make it possible that non iCloud users can still work with my text app Or do I simply ignore them Would I need to write separate functions for non iCloud users I.e. functions in which I simply load.. all other files in your app sandbox. However in my case there is no 'normal' app sandbox anymore. It's in the cloud. Or do I always load my text.txt from disk first and then check with iCloud if there is something more up to date Related problem..
http://stackoverflow.com/questions/8088473/url-encode-an-nsstring appendFormat @ 02X thisChar return output Used like this NSString urlEncodedString @ SOME_URL_GOES_HERE urlencode Or with an already existing string NSString someUrlString @ someURL NSString encodedUrlStr someUrlString urlencode This also..
View Controllers: How to switch between views programmatically? http://stackoverflow.com/questions/910994/view-controllers-how-to-switch-between-views-programmatically viewDidDisappear or viewDidLoad I believe that the Tab Bar Controller has all this cleverness under the hood. Or am I wrong UPDATE I've tested it. If I release the view controller for example ViewControllerA I will get no log message..
how to create iphone's wobbling icon effect? http://stackoverflow.com/questions/929364/how-to-create-iphones-wobbling-icon-effect NSArray arrayWithObjects initial middle final nil imageView.layer addAnimation animation forKey keypath Or there could be a totally simpler solution that I'm just missing. Appreciate any pointers. Thanks iphone ios animation rotation..
How to post more parameters with image upload code in iOS? http://stackoverflow.com/questions/10618056/how-to-post-more-parameters-with-image-upload-code-in-ios copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED AS IS WITHOUT WARRANTY OF ANY KIND EXPRESS OR IMPLIED INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT... WARRANTY OF ANY KIND EXPRESS OR IMPLIED INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM DAMAGES.. TO THE WARRANTIES OF MERCHANTABILITY FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM DAMAGES OR OTHER LIABILITY WHETHER IN AN ACTION OF CONTRACT TORT OR OTHERWISE..
Optimizing CLLocationManager/CoreLocation to retrieve data points faster on the iPhone http://stackoverflow.com/questions/1081219/optimizing-cllocationmanager-corelocation-to-retrieve-data-points-faster-on-the to do Take a new value only if it is recent AND If the new location has slightly better accuracy take the new location OR If the new location has an accuracy 50 meters take the new location OR If the number of attempts has exceeded 3 or 5 AND.. slightly better accuracy take the new location OR If the new location has an accuracy 50 meters take the new location OR If the number of attempts has exceeded 3 or 5 AND the accuracy 150 meters AND the location has CHANGED then this is a new.. of operation If the value is recent AND If the new location has slightly better accuracy take the new location OR If the new location has an accuracy 50 meters take the new location OR If the attempts is maxed 3 5 AND the accuracy 150..
NSFetchedResultsController with sections created by first letter of a string http://stackoverflow.com/questions/1112521/nsfetchedresultscontroller-with-sections-created-by-first-letter-of-a-string
How to use the first character as a section name http://stackoverflow.com/questions/1741093/how-to-use-the-first-character-as-a-section-name support UTF 16 NSString stringToReturn aString substringWithRange aString rangeOfComposedCharacterSequenceAtIndex 0 OR no UTF 16 support NSString stringToReturn aString substringToIndex 1 self didAccessValueForKey @ uppercaseFirstLetterOfName..
http://stackoverflow.com/questions/18736954/missing-recommended-icon-file-the-bundle-does-not-contain-an-app-icon-for-iph OS to interpolate them As per the blog post New Metrics for iOS 7 App Icons . UPDATE As per Apple Guideline App icon OR Icon and Image Sizes Icon dimensions iOS 7 and later Icon dimensions iOS 6.1 and earlier Create different sizes of the app..
Setting direction for UISwipeGestureRecognizer http://stackoverflow.com/questions/3319209/setting-direction-for-uiswipegesturerecognizer You may specify multiple directions by specifying multiple UISwipeGestureRecognizerDirection constants using bitwise OR operands. The default direction is UISwipeGestureRecognizerDirectionRight. However for me it doesn't work. When all four.. direction is UISwipeGestureRecognizerDirectionRight. However for me it doesn't work. When all four directions are OR'ed only left and right swipes are recognized. void viewDidLoad UISwipeGestureRecognizer recognizer recognizer UISwipeGestureRecognizer..
iVar property, access via self? http://stackoverflow.com/questions/4088801/ivar-property-access-via-self nonatomic retain NSMutableArray foundList @end . self foundList addObject eachObject I usually write this ... OR foundList addObject eachObject gary. iphone objective c cocoa touch share improve this question If you have a defined..
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