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2014/10/15 ¤U¤È 10:12:20
iphone Programming Glossary: onceHow 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 it to 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..
http://stackoverflow.com/questions/1388467/reading-epub-format of everything in the manifest plus a few extra files The specs look a bit daunting but actually once you've got the basics unzipping parsing XML down it's not particularly difficult or complex. You'll..
This class is not key value coding-compliant for the key http://stackoverflow.com/questions/3088059/this-class-is-not-key-value-coding-compliant-for-the-key have names like string in Objective C. It invites a runtime naming collision. Avoid them even in once off practice apps. Naming collisions can be very hard to track down and you don't want to waste the..
EXC_BAD_ACCESS signal received http://stackoverflow.com/questions/327082/exc-bad-access-signal-received execute within the simulator which is why it did not throw any errors. However it would execute once deployed to the device. Most of the answers to this question deal with the general EXC_BAD_ACCESS error..
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework can be precalculated. note that if you are doing this in real code you probably want to do this once when the app loads and call the complimentary release function once when it quits. DON'T do it lots.. you probably want to do this once when the app loads and call the complimentary release function once when it quits. DON'T do it lots of times it is expensive. let's say log2n 8 so n 2^8 256 samples or..
Fast and Lean PDF Viewer for iPhone / iPad / iOs - tips and hints? http://stackoverflow.com/questions/3889634/fast-and-lean-pdf-viewer-for-iphone-ipad-ios-tips-and-hints thread issues here too and presenting it while the scale is x1. CATiledLayer rendering kicks in once the scale is 1. iBooks takes a similar double take approach as if you scroll the pages you can see a..
http://stackoverflow.com/questions/402/iphone-app-in-landscape-mode a major know bug window addSubview happyThing.view window makeKeyAndVisible You can do that only once . Later if you try to remove happyThing.view and instead put in there newThing.view IT DOES NOT WORK..
iOS SDK - Programmatically generate a PDF file http://stackoverflow.com/questions/4362734/ios-sdk-programmatically-generate-a-pdf-file PDF generation. It was a little tricky getting libHaru to build with my project initially but once I got my project setup properly it worked fine for my needs. Second depending on the format layout of..
iPhone - Backgrounding to poll for events http://stackoverflow.com/questions/4656214/iphone-backgrounding-to-poll-for-events If you use one of the backgrounding features the app will be launched by iOS in background again once it was quit by the system . This we will abuse later. In my case I used VoIP backgrounding enabled in..
Change User Agent in UIWebView (iPhone SDK) http://stackoverflow.com/questions/478387/change-user-agent-in-uiwebview-iphone-sdk appears to work in 4.3 and earlier also. Change the UserAgent default value by running this code once when your app starts NSDictionary dictionary NSDictionary dictionaryWithObjectsAndKeys @ Your user agent..
Xcode 4: create IPA file instead of .xcarchive http://stackoverflow.com/questions/5265292/xcode-4-create-ipa-file-instead-of-xcarchive except the application target and set Skip Install flag to YES. Then do the Product Archive tango once again and go to the Organizer to select your new archive. Now when clicking on the Share button the..
What's the best way to communicate between view controllers? http://stackoverflow.com/questions/569940/whats-the-best-way-to-communicate-between-view-controllers question These are good questions and its great to see that you're doing this research and seem concerned with learning how to do it right instead of just hacking it together. First I agree with the previous.. talking about dependency injection. In this example what should the BookPickerViewController do once the user has picked his her books and is ready to check out Well that's not really its job. It should..
Create singleton using GCD's dispatch_once in Objective C http://stackoverflow.com/questions/5720029/create-singleton-using-gcds-dispatch-once-in-objective-c singleton using GCD's dispatch_once in Objective C If you can target iOS 4.0 or above Using GCD is it the best way to create singleton.. it the best way to create singleton in Objective C thread safe id sharedInstance static dispatch_once_t once static id sharedInstance dispatch_once once ^ sharedInstance self alloc init return sharedInstance.. best way to create singleton in Objective C thread safe id sharedInstance static dispatch_once_t once static id sharedInstance dispatch_once once ^ sharedInstance self alloc init return sharedInstance..
http://stackoverflow.com/questions/603907/uiimage-resize-then-crop right on the edge of revelation I simply cannot achieve my goal. I thought ahead of time in the conceptual phases of my design that it would be a trivial matter to grab a image from the iPhone's camera.. share improve this question I needed the same thing in my case to pick the dimension that fits once scaled and then crop each end to fit the rest to the width. I'm working in landscape so might not have..
Understanding reference counting with Cocoa and Objective-C http://stackoverflow.com/questions/6578/understanding-reference-counting-with-cocoa-and-objective-c with a view to playing with the iPhone SDK. I'm reasonably comfortable with C's malloc and free concept but Cocoa's references counting scheme has me rather confused. I'm told it's very elegant once you.. concept but Cocoa's references counting scheme has me rather confused. I'm told it's very elegant once you understand it but I'm just not over the hump yet. How do release retain and autorelease work and.. this question Let's start with retain and release autorelease is really just a special case once you understand the basic concepts. In Cocoa each object keeps track of how many times it is being referenced..
Dispelling the UIImage imageNamed: FUD http://stackoverflow.com/questions/924740/dispelling-the-uiimage-imagenamed-fud that image everytime the image data is needed. As you can imagine if you only need the image data once you've won nothing here except to have a cached version of the image hanging around and likely for longer..
UIImagePickerController and extracting EXIF data from existing photos http://stackoverflow.com/questions/1238838/uiimagepickercontroller-and-extracting-exif-data-from-existing-photos it's up to you to use the CLLocationManager to retrieve the current CLocation Once you have it you can use this method that uses exif iPhone library to geotag the UIImage from the CLLocation..
Programmatically turn on bluetooth in the iphone sdk? http://stackoverflow.com/questions/1743610/programmatically-turn-on-bluetooth-in-the-iphone-sdk is one here http iphone dev.googlecode.com svn branches include 1.2 sdk include BluetoothManager Once that is added to your project your import should look like this if the header file was already in the..
Install xCode 3.2.3 w/ iPhone SDK 4, get “Base SDK missing”, can't see other SDKs http://stackoverflow.com/questions/3161385/install-xcode-3-2-3-w-iphone-sdk-4-get-base-sdk-missing-cant-see-other-sdk The SDK you use to compile does not limit downward what iOS version you can program to or support. Once you've patched things up in your project etc. cf. next section you can set iPhone OS Deployment Target..
Can I make POST or GET requests from an iphone application? http://stackoverflow.com/questions/319463/can-i-make-post-or-get-requests-from-an-iphone-application NSError error Show error void connectionDidFinishLoading NSURLConnection connection Once this method is invoked responseData contains the complete result This will send a GET. By the time the..
Managing multiple asynchronous NSURLConnection connections http://stackoverflow.com/questions/332276/managing-multiple-asynchronous-nsurlconnection-connections NSURLConnection whereas NSDictionary copies its keys and NSURLConnection doesn't support copying . Once that's done CFDictionaryAddValue connectionToInfoMapping connection NSMutableDictionary dictionaryWithObject..
Play sound on iPhone even in silent mode http://stackoverflow.com/questions/3740528/play-sound-on-iphone-even-in-silent-mode error nil should do the trick. Note if you play music or sounds then iPod playback will be paused. Once this has been done probably somewhere in the initialisation of one of your classes that plays the sounds..
Lock-down iPhone/iPod/iPad so it can only run one app http://stackoverflow.com/questions/5011774/lock-down-iphone-ipod-ipad-so-it-can-only-run-one-app an example plist that will disable the home button and lock your device into the app. BEWARE Once this profile is installed the first app that is launched when the device is rebooted will be the only..
UIImagePickerController camera preview is portrait in landscape app http://stackoverflow.com/questions/538041/uiimagepickercontroller-camera-preview-is-portrait-in-landscape-app from the camera is in portrait orientation with blank space around it. The image is rotated. Once the camera button is pressed the preview is very messy with most of the preview off screen and views..
How to distribute ios application wirelessly without managing UDIDs and recompilation http://stackoverflow.com/questions/5546581/how-to-distribute-ios-application-wirelessly-without-managing-udids-and-recompil device ID's built into it if you're not part of the enterprise program but you can try and see. Once your files are all on the ftp server you'll need to create an email that has links to the two files..
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 This may be close to the actual method signature of the method but will not always match exactly. Once you have the IMP you need to cast it to a function pointer that includes all of the details that ARC..
Faster alternative to glReadPixels in iPhone OpenGL ES 2.0 http://stackoverflow.com/questions/9550297/faster-alternative-to-glreadpixels-in-iphone-opengl-es-2-0 object FBO with an attached texture with that texture having been supplied from the texture cache. Once you render your scene into that FBO the BGRA pixels for that scene will be contained within your CVPixelBufferRef.. assetWriterVideoInput sourcePixelBufferAttributes sourcePixelBufferAttributesDictionary Once I have that I configure the FBO that I'll be rendering my video frames to using the following code if.. input creates and associates a texture with it and uses that texture as a target for my FBO. Once I've rendered a frame I lock the base address of the pixel buffer CVPixelBufferLockBaseAddress pixel_buffer..
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 a UIView with UITextFields that brings up a keyboard. I need it to 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..
http://stackoverflow.com/questions/1388467/reading-epub-format one to define how everything is packaged up OEBPS a zip file of everything in the manifest plus a few extra files The specs look a bit daunting but actually once you've got the basics unzipping parsing XML down it's not particularly difficult or complex. You'll need to work out how to download the EPUB to unzip it somewhere..
This class is not key value coding-compliant for the key http://stackoverflow.com/questions/3088059/this-class-is-not-key-value-coding-compliant-for-the-key
EXC_BAD_ACCESS signal received http://stackoverflow.com/questions/327082/exc-bad-access-signal-received to be an error in the accelerometer code. It would not execute within the simulator which is why it did not throw any errors. However it would execute once deployed to the device. Most of the answers to this question deal with the general EXC_BAD_ACCESS error so I will leave this open as a catch all for the dreaded..
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework nOver2 sizeof float Next it pre calculates everything that can be precalculated. note that if you are doing this in real code you probably want to do this once when the app loads and call the complimentary release function once when it quits. DON'T do it lots of times it is expensive. let's say log2n 8 so n 2^8 256 samples.. precalculated. note that if you are doing this in real code you probably want to do this once when the app loads and call the complimentary release function once when it quits. DON'T do it lots of times it is expensive. let's say log2n 8 so n 2^8 256 samples or 'harmonics' or 'terms' if we pre calculate the 256th roots of..
Fast and Lean PDF Viewer for iPhone / iPad / iOs - tips and hints? http://stackoverflow.com/questions/3889634/fast-and-lean-pdf-viewer-for-iphone-ipad-ios-tips-and-hints PDF viewer and am rendering a UIImage of a page in a separate thread issues here too and presenting it while the scale is x1. CATiledLayer rendering kicks in once the scale is 1. iBooks takes a similar double take approach as if you scroll the pages you can see a lower res version of the page for just less than a second before..
http://stackoverflow.com/questions/402/iphone-app-in-landscape-mode you swap between your views. In other words in iOS because of a major know bug window addSubview happyThing.view window makeKeyAndVisible You can do that only once . Later if you try to remove happyThing.view and instead put in there newThing.view IT DOES NOT WORK AND THAT'S THAT. The machine will never rotate the view to..
iOS SDK - Programmatically generate a PDF file http://stackoverflow.com/questions/4362734/ios-sdk-programmatically-generate-a-pdf-file libHaru successfully on iPhone as a replacement for CoreGraphics PDF generation. It was a little tricky getting libHaru to build with my project initially but once I got my project setup properly it worked fine for my needs. Second depending on the format layout of your PDF you might consider using Interface Builder to create..
iPhone - Backgrounding to poll for events http://stackoverflow.com/questions/4656214/iphone-backgrounding-to-poll-for-events still uncertain how this may influence the reviewing process. If you use one of the backgrounding features the app will be launched by iOS in background again once it was quit by the system . This we will abuse later. In my case I used VoIP backgrounding enabled in my plist. All the code here is done in your AppDelegate if..
Change User Agent in UIWebView (iPhone SDK) http://stackoverflow.com/questions/478387/change-user-agent-in-uiwebview-iphone-sdk pointed out in an answer below. In comments on that page it appears to work in 4.3 and earlier also. Change the UserAgent default value by running this code once when your app starts NSDictionary dictionary NSDictionary dictionaryWithObjectsAndKeys @ Your user agent @ UserAgent nil NSUserDefaults standardUserDefaults registerDefaults..
Xcode 4: create IPA file instead of .xcarchive http://stackoverflow.com/questions/5265292/xcode-4-create-ipa-file-instead-of-xcarchive as follows go through build settings for each of the targets except the application target and set Skip Install flag to YES. Then do the Product Archive tango once again and go to the Organizer to select your new archive. Now when clicking on the Share button the .ipa option should be enabled. I hope this helps. share improve..
What's the best way to communicate between view controllers? http://stackoverflow.com/questions/569940/whats-the-best-way-to-communicate-between-view-controllers touch delegates key value observing share improve this question These are good questions and its great to see that you're doing this research and seem concerned with learning how to do it right instead of just hacking it together. First I agree with the previous answers which focus on the importance of putting data.. pattern to communicate back up the hierarchy they're still talking about dependency injection. In this example what should the BookPickerViewController do once the user has picked his her books and is ready to check out Well that's not really its job. It should DELEGATE that work to some other object which means that it..
Create singleton using GCD's dispatch_once in Objective C http://stackoverflow.com/questions/5720029/create-singleton-using-gcds-dispatch-once-in-objective-c singleton using GCD's dispatch_once in Objective C If you can target iOS 4.0 or above Using GCD is it the best way to create singleton in Objective C thread safe id sharedInstance static dispatch_once_t.. Objective C If you can target iOS 4.0 or above Using GCD is it the best way to create singleton in Objective C thread safe id sharedInstance static dispatch_once_t once static id sharedInstance dispatch_once once ^ sharedInstance self alloc init return sharedInstance iphone ios objective c xcode singleton share improve.. C If you can target iOS 4.0 or above Using GCD is it the best way to create singleton in Objective C thread safe id sharedInstance static dispatch_once_t once static id sharedInstance dispatch_once once ^ sharedInstance self alloc init return sharedInstance iphone ios objective c xcode singleton share improve this..
http://stackoverflow.com/questions/603907/uiimage-resize-then-crop days now and even though I feel constantly that I am right on the edge of revelation I simply cannot achieve my goal. I thought ahead of time in the conceptual phases of my design that it would be a trivial matter to grab a image from the iPhone's camera or library scale it down to a specified height using a function.. for your help. iphone ios image processing core graphics share improve this question I needed the same thing in my case to pick the dimension that fits once scaled and then crop each end to fit the rest to the width. I'm working in landscape so might not have noticed any deficiencies in portrait mode. Here's my code..
Understanding reference counting with Cocoa and Objective-C http://stackoverflow.com/questions/6578/understanding-reference-counting-with-cocoa-and-objective-c C I'm just beginning to have a look at Objective C and Cocoa with a view to playing with the iPhone SDK. I'm reasonably comfortable with C's malloc and free concept but Cocoa's references counting scheme has me rather confused. I'm told it's very elegant once you understand it but I'm just not over the hump yet. How do release.. SDK. I'm reasonably comfortable with C's malloc and free concept but Cocoa's references counting scheme has me rather confused. I'm told it's very 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.. you get it iphone objective c cocoa memory share improve this question Let's start with retain and release autorelease is really just a special case once you understand the basic concepts. In Cocoa each object keeps track of how many times it is being referenced specifically the NSObject base class implements this..
Dispelling the UIImage imageNamed: FUD http://stackoverflow.com/questions/924740/dispelling-the-uiimage-imagenamed-fud 4 . By contrast imageWithContentsOfFile will decompress that image everytime the image data is needed. As you can imagine if you only need the image data once you've won nothing here except to have a cached version of the image hanging around and likely for longer than you need it. However if you do have a large image..
UIImagePickerController and extracting EXIF data from existing photos http://stackoverflow.com/questions/1238838/uiimagepickercontroller-and-extracting-exif-data-from-existing-photos pictures returned by the picker. Before triggering the UIImagePickerController it's up to you to use the CLLocationManager to retrieve the current CLocation Once you have it you can use this method that uses exif iPhone library to geotag the UIImage from the CLLocation NSData geotagImage UIImage image withLocation CLLocation..
Programmatically turn on bluetooth in the iphone sdk? http://stackoverflow.com/questions/1743610/programmatically-turn-on-bluetooth-in-the-iphone-sdk and include it in your project. I googled to find it Here is one here http iphone dev.googlecode.com svn branches include 1.2 sdk include BluetoothManager Once 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..
Install xCode 3.2.3 w/ iPhone SDK 4, get “Base SDK missing”, can't see other SDKs http://stackoverflow.com/questions/3161385/install-xcode-3-2-3-w-iphone-sdk-4-get-base-sdk-missing-cant-see-other-sdk still target devices running iPhone OS 3.0 but not lower . The SDK you use to compile does not limit downward what iOS version you can program to or support. Once you've patched things up in your project etc. cf. next section you can set iPhone OS Deployment Target to a lower iOS version. For a quick shot of how to do this..
Can I make POST or GET requests from an iphone application? http://stackoverflow.com/questions/319463/can-i-make-post-or-get-requests-from-an-iphone-application data void connection NSURLConnection connection didFailWithError NSError error Show error void connectionDidFinishLoading NSURLConnection connection Once this method is invoked responseData contains the complete result This will send a GET. By the time the final method is called responseData will contain the entire..
Managing multiple asynchronous NSURLConnection connections http://stackoverflow.com/questions/332276/managing-multiple-asynchronous-nsurlconnection-connections I do it because this CFDictionary only retains its keys the NSURLConnection whereas NSDictionary copies its keys and NSURLConnection doesn't support copying . Once that's done CFDictionaryAddValue connectionToInfoMapping connection NSMutableDictionary dictionaryWithObject NSMutableData data forKey @ receivedData and now I..
Play sound on iPhone even in silent mode http://stackoverflow.com/questions/3740528/play-sound-on-iphone-even-in-silent-mode sharedInstance setCategory AVAudioSessionCategoryPlayback error nil should do the trick. Note if you play music or sounds then iPod playback will be paused. Once this has been done probably somewhere in the initialisation of one of your classes that plays the sounds you can instanciate sounds like this probably an instance..
Lock-down iPhone/iPod/iPad so it can only run one app http://stackoverflow.com/questions/5011774/lock-down-iphone-ipod-ipad-so-it-can-only-run-one-app remove it. Reboot you should be back to normal. I have included an example plist that will disable the home button and lock your device into the app. BEWARE Once this profile is installed the first app that is launched when the device is rebooted will be the only app that will run until you reboot the device again. As @Cawas..
UIImagePickerController camera preview is portrait in landscape app http://stackoverflow.com/questions/538041/uiimagepickercontroller-camera-preview-is-portrait-in-landscape-app to take a photo but the live image displayed from the camera is in portrait orientation with blank space around it. The image is rotated. Once the camera button is pressed the preview is very messy with most of the preview off screen and views not correctly aligned. Apple has acknowledged that this is..
How to distribute ios application wirelessly without managing UDIDs and recompilation http://stackoverflow.com/questions/5546581/how-to-distribute-ios-application-wirelessly-without-managing-udids-and-recompil if you will need a .mobileprovision file that has all of the device ID's built into it if you're not part of the enterprise program but you can try and see. Once your files are all on the ftp server you'll need to create an email that has links to the two files but the link for the .ipa file has to be in a special format...
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 simple typedef ed function pointers id IMP id SEL ... 1 . This may be close to the actual method signature of the method but will not always match exactly. Once you have the IMP you need to cast it to a function pointer that includes all of the details that ARC needs including the two implicit hidden arguments self and..
Faster alternative to glReadPixels in iPhone OpenGL ES 2.0 http://stackoverflow.com/questions/9550297/faster-alternative-to-glreadpixels-in-iphone-opengl-es-2-0 pixels for an OpenGL ES rendering by using a framebuffer object FBO with an attached texture with that texture having been supplied from the texture cache. Once you render your scene into that FBO the BGRA pixels for that scene will be contained within your CVPixelBufferRef so there will be no need to pull them down using.. assetWriterInputPixelBufferAdaptorWithAssetWriterInput assetWriterVideoInput sourcePixelBufferAttributes sourcePixelBufferAttributesDictionary Once I have that I configure the FBO that I'll be rendering my video frames to using the following code if GPUImageOpenGLESContext supportsFastTextureUpload CVReturn.. a pixel buffer from the pool associated with my asset writer input creates and associates a texture with it and uses that texture as a target for my FBO. Once I've rendered a frame I lock the base address of the pixel buffer CVPixelBufferLockBaseAddress pixel_buffer 0 and then simply feed it into my asset writer to be..
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 a keyboard. I need it to 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..
http://stackoverflow.com/questions/1388467/reading-epub-format up OEBPS a zip file of everything in the manifest plus a few extra files The specs look a bit daunting but actually once you've got the basics unzipping parsing XML down it's not particularly difficult or complex. You'll need to work out how..
This class is not key value coding-compliant for the key http://stackoverflow.com/questions/3088059/this-class-is-not-key-value-coding-compliant-for-the-key it is bad practice to have names like string in Objective C. It invites a runtime naming collision. Avoid them even in once off practice apps. Naming collisions can be very hard to track down and you don't want to waste the time. share improve..
EXC_BAD_ACCESS signal received http://stackoverflow.com/questions/327082/exc-bad-access-signal-received code. It would not execute within the simulator which is why it did not throw any errors. However it would execute once deployed to the device. Most of the answers to this question deal with the general EXC_BAD_ACCESS error so I will leave..
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework everything that can be precalculated. note that if you are doing this in real code you probably want to do this once when the app loads and call the complimentary release function once when it quits. DON'T do it lots of times it is expensive... this in real code you probably want to do this once when the app loads and call the complimentary release function once when it quits. DON'T do it lots of times it is expensive. let's say log2n 8 so n 2^8 256 samples or 'harmonics' or 'terms'..
Fast and Lean PDF Viewer for iPhone / iPad / iOs - tips and hints? http://stackoverflow.com/questions/3889634/fast-and-lean-pdf-viewer-for-iphone-ipad-ios-tips-and-hints a page in a separate thread issues here too and presenting it while the scale is x1. CATiledLayer rendering kicks in once the scale is 1. iBooks takes a similar double take approach as if you scroll the pages you can see a lower res version of..
http://stackoverflow.com/questions/402/iphone-app-in-landscape-mode in iOS because of a major know bug window addSubview happyThing.view window makeKeyAndVisible You can do that only once . Later if you try to remove happyThing.view and instead put in there newThing.view IT DOES NOT WORK AND THAT'S THAT. The..
iOS SDK - Programmatically generate a PDF file http://stackoverflow.com/questions/4362734/ios-sdk-programmatically-generate-a-pdf-file for CoreGraphics PDF generation. It was a little tricky getting libHaru to build with my project initially but once I got my project setup properly it worked fine for my needs. Second depending on the format layout of your PDF you might..
iPhone - Backgrounding to poll for events http://stackoverflow.com/questions/4656214/iphone-backgrounding-to-poll-for-events reviewing process. If you use one of the backgrounding features the app will be launched by iOS in background again once it was quit by the system . This we will abuse later. In my case I used VoIP backgrounding enabled in my plist. All the..
Change User Agent in UIWebView (iPhone SDK) http://stackoverflow.com/questions/478387/change-user-agent-in-uiwebview-iphone-sdk on that page it appears to work in 4.3 and earlier also. Change the UserAgent default value by running this code once when your app starts NSDictionary dictionary NSDictionary dictionaryWithObjectsAndKeys @ Your user agent @ UserAgent nil..
Xcode 4: create IPA file instead of .xcarchive http://stackoverflow.com/questions/5265292/xcode-4-create-ipa-file-instead-of-xcarchive each of the targets except the application target and set Skip Install flag to YES. Then do the Product Archive tango once again and go to the Organizer to select your new archive. Now when clicking on the Share button the .ipa option should be..
What's the best way to communicate between view controllers? http://stackoverflow.com/questions/569940/whats-the-best-way-to-communicate-between-view-controllers share improve this question These are good questions and its great to see that you're doing this research and seem concerned with learning how to do it right instead of just hacking it together. First I agree with the previous answers which.. they're still talking about dependency injection. In this example what should the BookPickerViewController do once the user has picked his her books and is ready to check out Well that's not really its job. It should DELEGATE that work..
Create singleton using GCD's dispatch_once in Objective C http://stackoverflow.com/questions/5720029/create-singleton-using-gcds-dispatch-once-in-objective-c singleton using GCD's dispatch_once in Objective C If you can target iOS 4.0 or above Using GCD is it the best way to create singleton in Objective C thread.. or above Using GCD is it the best way to create singleton in Objective C thread safe id sharedInstance static dispatch_once_t once static id sharedInstance dispatch_once once ^ sharedInstance self alloc init return sharedInstance iphone ios objective.. Using GCD is it the best way to create singleton in Objective C thread safe id sharedInstance static dispatch_once_t once static id sharedInstance dispatch_once once ^ sharedInstance self alloc init return sharedInstance iphone ios objective..
http://stackoverflow.com/questions/603907/uiimage-resize-then-crop constantly that I am right on the edge of revelation I simply cannot achieve my goal. I thought ahead of time in the conceptual phases of my design that it would be a trivial matter to grab a image from the iPhone's camera or library scale it.. core graphics share improve this question I needed the same thing in my case to pick the dimension that fits once scaled and then crop each end to fit the rest to the width. I'm working in landscape so might not have noticed any deficiencies..
Understanding reference counting with Cocoa and Objective-C http://stackoverflow.com/questions/6578/understanding-reference-counting-with-cocoa-and-objective-c Objective C and Cocoa with a view to playing with the iPhone SDK. I'm reasonably comfortable with C's malloc and free concept but Cocoa's references counting scheme has me rather confused. I'm told it's very elegant once you understand it but I'm.. C's malloc and free concept but Cocoa's references counting scheme has me rather confused. I'm told it's very 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.. memory share improve this question Let's start with retain and release autorelease is really just a special case once you understand the basic concepts. In Cocoa each object keeps track of how many times it is being referenced specifically..
Dispelling the UIImage imageNamed: FUD http://stackoverflow.com/questions/924740/dispelling-the-uiimage-imagenamed-fud will decompress that image everytime the image data is needed. As you can imagine if you only need the image data once you've won nothing here except to have a cached version of the image hanging around and likely for longer than you need..
UIImagePickerController and extracting EXIF data from existing photos http://stackoverflow.com/questions/1238838/uiimagepickercontroller-and-extracting-exif-data-from-existing-photos triggering the UIImagePickerController it's up to you to use the CLLocationManager to retrieve the current CLocation Once you have it you can use this method that uses exif iPhone library to geotag the UIImage from the CLLocation NSData geotagImage..
Programmatically turn on bluetooth in the iphone sdk? http://stackoverflow.com/questions/1743610/programmatically-turn-on-bluetooth-in-the-iphone-sdk to find it Here is one here http iphone dev.googlecode.com svn branches include 1.2 sdk include BluetoothManager Once that is added to your project your import should look like this if the header file was already in the framework #import..
Install xCode 3.2.3 w/ iPhone SDK 4, get “Base SDK missing”, can't see other SDKs http://stackoverflow.com/questions/3161385/install-xcode-3-2-3-w-iphone-sdk-4-get-base-sdk-missing-cant-see-other-sdk 3.0 but not lower . The SDK you use to compile does not limit downward what iOS version you can program to or support. Once you've patched things up in your project etc. cf. next section you can set iPhone OS Deployment Target to a lower iOS version...
Can I make POST or GET requests from an iphone application? http://stackoverflow.com/questions/319463/can-i-make-post-or-get-requests-from-an-iphone-application connection didFailWithError NSError error Show error void connectionDidFinishLoading NSURLConnection connection Once this method is invoked responseData contains the complete result This will send a GET. By the time the final method is called..
Managing multiple asynchronous NSURLConnection connections http://stackoverflow.com/questions/332276/managing-multiple-asynchronous-nsurlconnection-connections its keys the NSURLConnection whereas NSDictionary copies its keys and NSURLConnection doesn't support copying . Once that's done CFDictionaryAddValue connectionToInfoMapping connection NSMutableDictionary dictionaryWithObject NSMutableData..
Tab Bar Application With Navigation Controller http://stackoverflow.com/questions/369128/tab-bar-application-with-navigation-controller the nibs. Any thoughts or example code would be much appreciated Thanks iphone tabbar share improve this question Once you have a tab bar in a XIB the easiest way to approach this is to drag a UINavigationController object over from the Library..
Play sound on iPhone even in silent mode http://stackoverflow.com/questions/3740528/play-sound-on-iphone-even-in-silent-mode error nil should do the trick. Note if you play music or sounds then iPod playback will be paused. Once this has been done probably somewhere in the initialisation of one of your classes that plays the sounds you can instanciate..
How can I pop a view from a UINavigationController and replace it with another in one operation? http://stackoverflow.com/questions/410471/how-can-i-pop-a-view-from-a-uinavigationcontroller-and-replace-it-with-another-i retain and properly release self or the object who owns the method you are in will be deallocated causing strangeness. Once you do that prep then just pop and push as normal. This code will instantly replace the top controller with another. locally..
http://stackoverflow.com/questions/4194394/client-server-gksessions It is very likely you will want to NOT use the P2P model so all of the above explains how to DISABLE the P2P stuff. Once again to repeat for absolute clarity GK surpriginsly contains a P2P mode. This is technologically amazing. You can of course..
Is it possible to refresh a single UITableViewCell in a UITableView? http://stackoverflow.com/questions/4448321/is-it-possible-to-refresh-a-single-uitableviewcell-in-a-uitableview is appreciated. Thanks in advance. iphone objective c uitableview uitableviewcell share improve this question Once you have the indexPath of your cell you can do something like self.tableView beginUpdates self.tableView reloadRowsAtIndexPaths..
Lock-down iPhone/iPod/iPad so it can only run one app http://stackoverflow.com/questions/5011774/lock-down-iphone-ipod-ipad-so-it-can-only-run-one-app normal. I have included an example plist that will disable the home button and lock your device into the app. BEWARE Once this profile is installed the first app that is launched when the device is rebooted will be the only app that will run..
What are the Dangers of Method Swizzling in Objective C? http://stackoverflow.com/questions/5339276/what-are-the-dangers-of-method-swizzling-in-objective-c self @selector my_setFrame frame Which will use the runtime to look up the implementation of my_setFrame . Once the implementation is found it invokes the implementation with the same arguments that were given. The implementation it..
UIImagePickerController camera preview is portrait in landscape app http://stackoverflow.com/questions/538041/uiimagepickercontroller-camera-preview-is-portrait-in-landscape-app the live image displayed from the camera is in portrait orientation with blank space around it. The image is rotated. Once the camera button is pressed the preview is very messy with most of the preview off screen and views not correctly aligned...
How to distribute ios application wirelessly without managing UDIDs and recompilation http://stackoverflow.com/questions/5546581/how-to-distribute-ios-application-wirelessly-without-managing-udids-and-recompil that has all of the device ID's built into it if you're not part of the enterprise program but you can try and see. Once your files are all on the ftp server you'll need to create an email that has links to the two files but the link for the..
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 id SEL ... 1 . This may be close to the actual method signature of the method but will not always match exactly. Once you have the IMP you need to cast it to a function pointer that includes all of the details that ARC needs including the..
learning iphone game development http://stackoverflow.com/questions/720901/learning-iphone-game-development improve this question I'd skip OpenGL until later I'd start off with a 2D game otherwise its likely overwhelming. Once you have a 2D game you'll understand the platform enough to move into a 3D game either with a custom 3D engine built on..
What does the Xcode 4.2 preference “Support Wirelessly Connected Devices” do? http://stackoverflow.com/questions/7266391/what-does-the-xcode-4-2-preference-support-wirelessly-connected-devices-do called iOS Device Discovery with the checkbox option Support Wirelessly Connected Devices. What does this option do Once checked how can we use this new capability iphone objective c ios xcode share improve this question Plug your device..
Faster alternative to glReadPixels in iPhone OpenGL ES 2.0 http://stackoverflow.com/questions/9550297/faster-alternative-to-glreadpixels-in-iphone-opengl-es-2-0 using a framebuffer object FBO with an attached texture with that texture having been supplied from the texture cache. Once you render your scene into that FBO the BGRA pixels for that scene will be contained within your CVPixelBufferRef so there.. assetWriterVideoInput sourcePixelBufferAttributes sourcePixelBufferAttributesDictionary Once I have that I configure the FBO that I'll be rendering my video frames to using the following code if GPUImageOpenGLESContext.. with my asset writer input creates and associates a texture with it and uses that texture as a target for my FBO. Once I've rendered a frame I lock the base address of the pixel buffer CVPixelBufferLockBaseAddress pixel_buffer 0 and then simply..
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