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2014/10/15 ¤U¤È 10:11:31
iphone Programming Glossary: mostHow 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 It's just testing for a gateway to any domain. Important Note The Reachability class is one of the most used classes in projects so you might run into naming conflicts with other projects like ShareKit. If..
Use CoreData or SQLite on iPhone? [closed] http://stackoverflow.com/questions/1318467/use-coredata-or-sqlite-on-iphone can greatly simplify your code particularly for complex object models. You get undo redo support almost for free with it. It also provides some very significant performance benefits particularly on the iPhone... Even though it seems counterintuitive given how much overhead you'd think the framework has in most cases you can beat the performance of hand tuned SQLite using Core Data. On the iPhone it does a great..
How to get the RGB values for a pixel on an image on the iphone http://stackoverflow.com/questions/144250/how-to-get-the-rgb-values-for-a-pixel-on-an-image-on-the-iphone in which I could extract this information for a given pixel A working code sample would be most appreciated and note that I am not concerned with the alpha value. iphone cocoa touch image bitmap..
iPhone ivar naming convention [duplicate] http://stackoverflow.com/questions/2114587/iphone-ivar-naming-convention
iPhone image stretching (skew) http://stackoverflow.com/questions/2351586/iphone-image-stretching-skew to the expected locations. 6 unique coordinates and 6 variables should have exactly 1 solution most of the cases. When you have found these 6 constants you can craft a CATransform3D . Notice the structure..
Is it true that one should not use NSLog() on production code? http://stackoverflow.com/questions/300673/is-it-true-that-one-should-not-use-nslog-on-production-code building my Release Distribution builds. Should I avoid using this If so what alternatives are most common between experienced Objective C programmers iphone objective c nslog share improve this question..
EXC_BAD_ACCESS signal received http://stackoverflow.com/questions/327082/exc-bad-access-signal-received c ios xcode cocoa touch share improve this question From your description I suspect the most likely explanation is that you have some error in your memory management. You said you've been working..
Managing multiple asynchronous NSURLConnection connections http://stackoverflow.com/questions/332276/managing-multiple-asynchronous-nsurlconnection-connections requests kind of like you're able to tag views with IDs. I was curious what strategy is most efficient for managing a class that handles multiple asynchronous requests. iphone objective c cocoa..
Build fat static library (device + simulator) using Xcode and SDK 4+ http://stackoverflow.com/questions/3520977/build-fat-static-library-device-simulator-using-xcode-and-sdk-4 on the last icon on the right in the top left area of Xcode4. Select the top item this is your most recent build . Apple should auto select it but they didn't think of that in the main window scroll to..
parsing HTML on the iPhone [closed] http://stackoverflow.com/questions/405749/parsing-html-on-the-iphone As hpple is a wrapper over XPathQuery which is another wrapper this option probably is not the most efficient. If performance is an issue in your project I recommend to code your own lightweight solution..
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 a MacBook the iPhone SDK Blender My knowledge base I can make 3D models in various 3D programs I'm most comfortable with 3D Studio Max which I once took a course on but I've used others General knowledge..
What's the best way to communicate between view controllers? http://stackoverflow.com/questions/569940/whats-the-best-way-to-communicate-between-view-controllers Being new to objective c cocoa and iPhone dev in general I have a strong desire to get the most out of the language and the frameworks. One of the resources I'm using is Stanford's CS193P class notes.. how to do this visually using Interface Builder take a look at this tutorial . Third and perhaps most importantly note that the best practices mentioned in the Stanford presentation are much easier to understand..
How do I create delegates in Objective-C? http://stackoverflow.com/questions/626898/how-do-i-create-delegates-in-objective-c then implement the methods in the protocol. For methods declared in the protocol as @optional like most delegate methods you still need to check with respondsToSelector before calling a particular method..
What is the best way to deal with the NSDateFormatter locale “feature”? http://stackoverflow.com/questions/6613110/what-is-the-best-way-to-deal-with-the-nsdateformatter-locale-feature NSString dateStr fmt stringFromDate someDate fmt release Then it works fine in the US and most locales UNTIL ... someone with their phone set to a 24 hour region sets the 12 24 hour switch in settings.. the bounty deadline for another day or two. Bounty ends in 21 hours it'll go to whoever makes the most effort to help even if the answer isn't really useful in my case. A curious observation Modified the..
UIDevice uniqueIdentifier Deprecated - What To Do Now? http://stackoverflow.com/questions/6993325/uidevice-uniqueidentifier-deprecated-what-to-do-now the same when the user uninstalls and re installs the app. This requires a bit of effort since the most reliable per device identifier seems to be the MAC address. You could query the MAC and use that as.. was pointed out by others the preferred solution since iOS 6 is UIDevice identifierForVendor . In most cases you should be able use it as a drop in replacement to the old UIDevice uniqueIdentifier but a..
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 Do nothing assume returned object value will be valid in local scope until inner most release pool is drained attributed with ns_returns_autoreleased The call to methodForSelector assumes..
How do I draw a line on the iPhone? http://stackoverflow.com/questions/856354/how-do-i-draw-a-line-on-the-iphone for functions beginning with CGContext in the Xcode documentation viewer and browse through those most of the Core Graphics functions you'll end up using will start with the term CGContext . share improve..
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 for that as well. Note The domain you use doesn't matter. It's just testing for a gateway to any domain. Important Note The Reachability class is one of the most used classes in projects so you might run into naming conflicts with other projects like ShareKit. If this happens you'll have to rename one of the pairs of Reachability.h..
Use CoreData or SQLite on iPhone? [closed] http://stackoverflow.com/questions/1318467/use-coredata-or-sqlite-on-iphone or complicated subtable views In summary Core Data can greatly simplify your code particularly for complex object models. You get undo redo support almost for free with it. It also provides some very significant performance benefits particularly on the iPhone. Even though it seems counterintuitive given how much overhead.. significant performance benefits particularly on the iPhone. Even though it seems counterintuitive given how much overhead you'd think the framework has in most cases you can beat the performance of hand tuned SQLite using Core Data. On the iPhone it does a great job of batching fetches to minimize memory usage. The one..
How to get the RGB values for a pixel on an image on the iphone http://stackoverflow.com/questions/144250/how-to-get-the-rgb-values-for-a-pixel-on-an-image-on-the-iphone a way to convert the UIImage data into a bitmap representation in which I could extract this information for a given pixel A working code sample would be most appreciated and note that I am not concerned with the alpha value. iphone cocoa touch image bitmap share improve this question A little more detail... I posted..
iPhone ivar naming convention [duplicate] http://stackoverflow.com/questions/2114587/iphone-ivar-naming-convention
iPhone image stretching (skew) http://stackoverflow.com/questions/2351586/iphone-image-stretching-skew T . U 1 w' with appropriate P Q R S T U that maps the 4 points to the expected locations. 6 unique coordinates and 6 variables should have exactly 1 solution most of the cases. When you have found these 6 constants you can craft a CATransform3D . Notice the structure definition is struct CATransform3D CGFloat m11 m12 m13..
Is it true that one should not use NSLog() on production code? http://stackoverflow.com/questions/300673/is-it-true-that-one-should-not-use-nslog-on-production-code that Xcode gcc would automatically strip those calls out when building my Release Distribution builds. Should I avoid using this If so what alternatives are most common between experienced Objective C programmers iphone objective c nslog share improve this question Preprocessor macros are indeed great for debugging...
EXC_BAD_ACCESS signal received http://stackoverflow.com/questions/327082/exc-bad-access-signal-received signal before and how did you deal with it iphone objective c ios xcode cocoa touch share improve this question From your description I suspect the most likely explanation is that you have some error in your memory management. You said you've been working on iPhone development for a few weeks but not whether you..
Managing multiple asynchronous NSURLConnection connections http://stackoverflow.com/questions/332276/managing-multiple-asynchronous-nsurlconnection-connections other. It would be useful I think to be able to tag these asynchronous requests kind of like you're able to tag views with IDs. I was curious what strategy is most efficient for managing a class that handles multiple asynchronous requests. iphone objective c cocoa cocoa touch share improve this question I track responses..
Build fat static library (device + simulator) using Xcode and SDK 4+ http://stackoverflow.com/questions/3520977/build-fat-static-library-device-simulator-using-xcode-and-sdk-4 unexpected files in the wrong place. Build the project Click on the last icon on the right in the top left area of Xcode4. Select the top item this is your most recent build . Apple should auto select it but they didn't think of that in the main window scroll to bottom. The very last line should read lipo for current configuration..
parsing HTML on the iPhone [closed] http://stackoverflow.com/questions/405749/parsing-html-on-the-iphone element content xpathParser release data release Known issues As hpple is a wrapper over XPathQuery which is another wrapper this option probably is not the most efficient. If performance is an issue in your project I recommend to code your own lightweight solution based on hpple and xpathquery library code. share improve..
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 a background or anything. I have the following an iPhone a MacBook the iPhone SDK Blender My knowledge base I can make 3D models in various 3D programs I'm most comfortable with 3D Studio Max which I once took a course on but I've used others General knowledge of procedural programming from years ago QuickBasic I'm old..
What's the best way to communicate between view controllers? http://stackoverflow.com/questions/569940/whats-the-best-way-to-communicate-between-view-controllers the best way to communicate between view controllers Being new to objective c cocoa and iPhone dev in general I have a strong desire to get the most out of the language and the frameworks. One of the resources I'm using is Stanford's CS193P class notes that they have left on the web. It includes lecture notes.. controller onto the navigation controller. For an example of how to do this visually using Interface Builder take a look at this tutorial . Third and perhaps most importantly note that the best practices mentioned in the Stanford presentation are much easier to understand if you think about them in the context of the dependency..
How do I create delegates in Objective-C? http://stackoverflow.com/questions/626898/how-do-i-create-delegates-in-objective-c @interface MyDelegate NSWindowNotifications ... @end And then implement the methods in the protocol. For methods declared in the protocol as @optional like most delegate methods you still need to check with respondsToSelector before calling a particular method on it. Apple recommends this method because it is more precise..
What is the best way to deal with the NSDateFormatter locale “feature”? http://stackoverflow.com/questions/6613110/what-is-the-best-way-to-deal-with-the-nsdateformatter-locale-feature fmt NSDateFormatter alloc init fmt setDateFormat @ yyyyMMddHHmmss NSString dateStr fmt stringFromDate someDate fmt release Then it works fine in the US and most locales UNTIL ... someone with their phone set to a 24 hour region sets the 12 24 hour switch in settings to 12. Then the above starts tacking AM or PM onto the.. I haven't gotten any applicable replies yet I'll extend the bounty deadline for another day or two. Bounty ends in 21 hours it'll go to whoever makes the most effort to help even if the answer isn't really useful in my case. A curious observation Modified the category implementation slightly #import NSDateFormatter Locale.h..
UIDevice uniqueIdentifier Deprecated - What To Do Now? http://stackoverflow.com/questions/6993325/uidevice-uniqueidentifier-deprecated-what-to-do-now But you might want it to be not unique i. e. it should stay the same when the user uninstalls and re installs the app. This requires a bit of effort since the most reliable per device identifier seems to be the MAC address. You could query the MAC and use that as UUID. Edit One needs to always query the MAC of the same interface.. present even if the interface has no IP is down. Edit 2 As was pointed out by others the preferred solution since iOS 6 is UIDevice identifierForVendor . In most cases you should be able use it as a drop in replacement to the old UIDevice uniqueIdentifier but a UUID that is created when the app starts for the first time..
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 used methods in the init copy family or attributed with ns_returns_retained Do nothing assume returned object value will be valid in local scope until inner most release pool is drained attributed with ns_returns_autoreleased The call to methodForSelector assumes that the return value of the method it's calling is an object..
How do I draw a line on the iPhone? http://stackoverflow.com/questions/856354/how-do-i-draw-a-line-on-the-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 use doesn't matter. It's just testing for a gateway to any domain. Important Note The Reachability class is one of the most used classes in projects so you might run into naming conflicts with other projects like ShareKit. If this happens you'll..
Use CoreData or SQLite on iPhone? [closed] http://stackoverflow.com/questions/1318467/use-coredata-or-sqlite-on-iphone summary Core Data can greatly simplify your code particularly for complex object models. You get undo redo support almost for free with it. It also provides some very significant performance benefits particularly on the iPhone. Even though it.. on the iPhone. Even though it seems counterintuitive given how much overhead you'd think the framework has in most cases you can beat the performance of hand tuned SQLite using Core Data. On the iPhone it does a great job of batching fetches..
How to get the RGB values for a pixel on an image on the iphone http://stackoverflow.com/questions/144250/how-to-get-the-rgb-values-for-a-pixel-on-an-image-on-the-iphone a bitmap representation in which I could extract this information for a given pixel A working code sample would be most appreciated and note that I am not concerned with the alpha value. iphone cocoa touch image bitmap share improve this..
iPhone ivar naming convention [duplicate] http://stackoverflow.com/questions/2114587/iphone-ivar-naming-convention
iPhone image stretching (skew) http://stackoverflow.com/questions/2351586/iphone-image-stretching-skew that maps the 4 points to the expected locations. 6 unique coordinates and 6 variables should have exactly 1 solution most of the cases. When you have found these 6 constants you can craft a CATransform3D . Notice the structure definition is struct..
Is it true that one should not use NSLog() on production code? http://stackoverflow.com/questions/300673/is-it-true-that-one-should-not-use-nslog-on-production-code those calls out when building my Release Distribution builds. Should I avoid using this If so what alternatives are most common between experienced Objective C programmers iphone objective c nslog share improve this question Preprocessor..
EXC_BAD_ACCESS signal received http://stackoverflow.com/questions/327082/exc-bad-access-signal-received with it iphone objective c ios xcode cocoa touch share improve this question From your description I suspect the most likely explanation is that you have some error in your memory management. You said you've been working on iPhone development..
Managing multiple asynchronous NSURLConnection connections http://stackoverflow.com/questions/332276/managing-multiple-asynchronous-nsurlconnection-connections able to tag these asynchronous requests kind of like you're able to tag views with IDs. I was curious what strategy is most efficient for managing a class that handles multiple asynchronous requests. iphone objective c cocoa cocoa touch share..
Build fat static library (device + simulator) using Xcode and SDK 4+ http://stackoverflow.com/questions/3520977/build-fat-static-library-device-simulator-using-xcode-and-sdk-4 Build the project Click on the last icon on the right in the top left area of Xcode4. Select the top item this is your most recent build . Apple should auto select it but they didn't think of that in the main window scroll to bottom. The very last..
parsing HTML on the iPhone [closed] http://stackoverflow.com/questions/405749/parsing-html-on-the-iphone release Known issues As hpple is a wrapper over XPathQuery which is another wrapper this option probably is not the most efficient. If performance is an issue in your project I recommend to code your own lightweight solution based on hpple and..
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 following an iPhone a MacBook the iPhone SDK Blender My knowledge base I can make 3D models in various 3D programs I'm most comfortable with 3D Studio Max which I once took a course on but I've used others General knowledge of procedural programming..
What's the best way to communicate between view controllers? http://stackoverflow.com/questions/569940/whats-the-best-way-to-communicate-between-view-controllers between view controllers Being new to objective c cocoa and iPhone dev in general I have a strong desire to get the most out of the language and the frameworks. One of the resources I'm using is Stanford's CS193P class notes that they have left.. For an example of how to do this visually using Interface Builder take a look at this tutorial . Third and perhaps most importantly note that the best practices mentioned in the Stanford presentation are much easier to understand if you think..
How do I create delegates in Objective-C? http://stackoverflow.com/questions/626898/how-do-i-create-delegates-in-objective-c ... @end And then implement the methods in the protocol. For methods declared in the protocol as @optional like most delegate methods you still need to check with respondsToSelector before calling a particular method on it. Apple recommends..
What is the best way to deal with the NSDateFormatter locale “feature”? http://stackoverflow.com/questions/6613110/what-is-the-best-way-to-deal-with-the-nsdateformatter-locale-feature @ yyyyMMddHHmmss NSString dateStr fmt stringFromDate someDate fmt release Then it works fine in the US and most locales UNTIL ... someone with their phone set to a 24 hour region sets the 12 24 hour switch in settings to 12. Then the.. yet I'll extend the bounty deadline for another day or two. Bounty ends in 21 hours it'll go to whoever makes the most effort to help even if the answer isn't really useful in my case. A curious observation Modified the category implementation..
UIDevice uniqueIdentifier Deprecated - What To Do Now? http://stackoverflow.com/questions/6993325/uidevice-uniqueidentifier-deprecated-what-to-do-now e. it should stay the same when the user uninstalls and re installs the app. This requires a bit of effort since the most reliable per device identifier seems to be the MAC address. You could query the MAC and use that as UUID. Edit One needs.. is down. Edit 2 As was pointed out by others the preferred solution since iOS 6 is UIDevice identifierForVendor . In most cases you should be able use it as a drop in replacement to the old UIDevice uniqueIdentifier but a UUID that is created..
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 attributed with ns_returns_retained Do nothing assume returned object value will be valid in local scope until inner most release pool is drained attributed with ns_returns_autoreleased The call to methodForSelector assumes that the return value..
How do I draw a line on the iPhone? http://stackoverflow.com/questions/856354/how-do-i-draw-a-line-on-the-iphone
iOS Image Orientation has Strange Behavior http://stackoverflow.com/questions/10600613/ios-image-orientation-has-strange-behavior property. If the metadata specifies the orientation of the image which is generally ignored by other OS but Mac. Most of images taken are having their meta data property set to right angle. So Mac shows it 90 degree rotated manner. You can..
UIView's frame, bounds, center, origin, when to use what? http://stackoverflow.com/questions/1071112/uiviews-frame-bounds-center-origin-when-to-use-what when to use what UIView has the concept of frame bounds center and origin and they all seem to be interrelated. Most of the time I deal with frame when setting the position and size of a UIView or subclass . I understand that the frame is..
Code Sign error: The identity 'iPhone Developer: x Xxxxx' doesn't match any identity in any profile http://stackoverflow.com/questions/1072311/code-sign-error-the-identity-iphone-developer-x-xxxxx-doesnt-match-any-iden
Detect the specific iPhone/iPod touch model [duplicate] http://stackoverflow.com/questions/1108859/detect-the-specific-iphone-ipod-touch-model this have been lately approved in the AppStore. iphone objective c ios p2p devices share improve this question Most complete UIDevice Hardware category probably is http github.com erica uidevice extension by Erica Sadun UIDevice currentDevice..
http://stackoverflow.com/questions/1150360/ios-private-api-documentation private APIs for the iPhone SDK iphone api ios4 documentation iphone privateapi share improve this question Most likely. Just use the command line application class dump to view the private headers. Note that your app will be rejected..
http://stackoverflow.com/questions/12768109/how-to-use-ldid Not lowercase as Lois says. 2 Usually when I get this error it's because I built my app with the wrong architectures. Most older versions of ldid that I've used cannot sign fat binaries but see Update below . Fat binaries are ones with more than..
How do I synthesize sounds with CoreAudio on iPhone/Mac http://stackoverflow.com/questions/1361148/how-do-i-synthesize-sounds-with-coreaudio-on-iphone-mac a sine wave using sin what I don't know is how to arrange those bits into a packet which CoreAudio can then play. Most of the tutorials that exist on the net are concerned with simply playing existing binaries. Can anyone help me with a simple..
insertNewObjectForEntityForName: http://stackoverflow.com/questions/1780929/insertnewobjectforentityforname core data share improve this question The fact that you didn't set up the MOC is almost certainly the problem. Most specifically it means you're probably not loading your MOM Managed Object Model that defines Person. Somewhere in your code..
How to accommodate for the iPhone 4 screen resolution? http://stackoverflow.com/questions/2992360/how-to-accommodate-for-the-iphone-4-screen-resolution Multi Touch display 960 by 640 pixel resolution at 326 ppi This little detail affects our apps in a heavy way. Most of the demo apps on the net have one thing in common They position views in the believe that the screen has a fixed size..
EXC_BAD_ACCESS signal received http://stackoverflow.com/questions/327082/exc-bad-access-signal-received 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..
iPhone SDK difference between isKindOfClass and isMemberOfClass http://stackoverflow.com/questions/3653929/iphone-sdk-difference-between-iskindofclass-and-ismemberofclass inherits from the specified class. isMemberOfClass returns YES if the receiver is an instance of the specified class. Most of the time you want to use isKindOfClass to ensure that your code also works with subclasses. The NSObject Protocol Reference..
Subclassing NSOperation to be concurrent and cancellable http://stackoverflow.com/questions/3859631/subclassing-nsoperation-to-be-concurrent-and-cancellable I'll explain what you're misunderstanding and then give a corrected example. 1. Running NSOperations concurrently Most of the time you'll use NSOperation s with an NSOperationQueue and from your code it sounds like that's what you're doing...
Most effective way to do networking on Mac/iPhone? http://stackoverflow.com/questions/4269613/most-effective-way-to-do-networking-on-mac-iphone effective way to do networking on Mac iPhone What would be the most effective way that is best ratio of effort vs readability..
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 swizzling though they don't have to be. We just need to change the way that we think about method swizzling slightly. Most swizzling is done like this @interface NSView NSObject void setFrame NSRect frame @end @implementation NSView MyViewAdditions..
http://stackoverflow.com/questions/5355846/iphone-facebook-video-upload requests but the official developers never seem to merge anything not even trivial typo fixes in the documentation. Most of the time the pull requests simply sit there until rejected. And yes did I mention that the video upload code is a messy..
Am I abusing UIViewController Subclassing? http://stackoverflow.com/questions/5691226/am-i-abusing-uiviewcontroller-subclassing 2011 03 09 abusing uiviewcontrollers UIViewController subclassing should only happen in very specific situations. Most notably when added directly to the UIWindow or other Apple created custom controllers like UINavigationControllers. I'm..
Steps to upload an iPhone application to the AppStore http://stackoverflow.com/questions/796482/steps-to-upload-an-iphone-application-to-the-appstore followed by your name or company name. You may also want to confirm your application identifier in the Properties tab. Most likely you'll have set the identifier properly when debugging with your developer certificate but it never hurts to check...
To ARC or not to ARC? What are the pros and cons? http://stackoverflow.com/questions/8760431/to-arc-or-not-to-arc-what-are-the-pros-and-cons of id can take a little more thinking about to do correctly. Fancy handling of ObjC varargs can also cause trouble. Most things involving math on an ObjC pointer is trickier. You shouldn't have much of this in any case. You cannot put an id..
How to capture current view screenshot and reuse in code? (iPhone SDK) http://stackoverflow.com/questions/879064/how-to-capture-current-view-screenshot-and-reuse-in-code-iphone-sdk iphone core animation rotation share improve this question I can guarantee you window drawRect won't work. Most views don't implement drawRect and it's certainly not recursive like on the mac. drawInContext is also pretty much hosed..
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