“ARC is available in Xcode 4.2, currently in beta, and only when compiling with Clang (a.k.a. “Apple LLVM compiler”). The setting is called, obviously enough, “Objective-C Automatic Reference Counting”. Turn it on, and off you go. If you’re working on existing code, changing this setting will produce an enormous quantity of errors. ARC not only … Read more
Calling pushViewController before viewDidAppear is unsafe.
I was able to recover from this by unplugging the iPad, powering it down and back up, clearing all XCode caches and targets, and doing a clean build. I’m running XCode 3.5.4 and iOS 4.2.1 UPDATE: Same problem running Xcode 4.3 and iOS5 – just power-cycle the device.
If you don’t need any data inbetween drag, than you should simply set: [mySlider setContinuous: NO]; This way you will receive valueChanged event only when the user stops moving the slider. Swift 5 version: mySlider.isContinuous = false
Declare your AVAudioPlayer in the header the viewController ( don’t alloc a new one each time you play a sound). That way you will have a pointer you can use in a StopAudio method. @interface myViewController : UIViewController <AVAudioPlayerDelegate> { AVAudioPlayer *theAudio; } @property (nonatomic, retain) AVAudioPlayer *theAudio; @end @implementation myViewController @synthesize theAudio; – (void)dealloc … Read more
Why don’t you use CLLocations distanceFromLocation: method? It will tell you the precise distance between the receiver and another CLLocation. CLLocation *locationA = [[CLLocation alloc] initWithLatitude:12.123456 longitude:12.123456]; CLLocation *locationB = [[CLLocation alloc] initWithLatitude:21.654321 longitude:21.654321]; CLLocationDistance distanceInMeters = [locationA distanceFromLocation:locationB]; // CLLocation is aka double [locationA release]; [locationB release]; It’s as easy as that.
For iOS 5.1, run the app in the simulator, and run the following command in the Terminal: xattr {filename} You should see the following if the item is correctly marked for exclusion: com.apple.metadata:com_apple_backup_excludeItem
From the iPhone Application Programming Guide: Even if you develop your application using iPhone SDK 4 and later, you must still be prepared for your application to be terminated. If memory becomes constrained, the system might remove applications from memory in order to make more room. If your application is currently suspended, the system removes … Read more
Here’s a simple version of what you’re describing. It is “simple” in the sense that I didn’t bother trying to add the shading and other subtleties. But it’s easy to construct and you can tweak it to draw in a more subtle way if you like. For example, you could make your own image and … Read more
Disclaimer: This answer was valid until ios 4.3.3 If data protection is turned on, a newly created file will have a nil NSFileProtectionKey by default. If data protection is turned off, a newly created file will have a NSFileProtectionNone NSFileProtectionKey by default. Thus, you could detect the presence of file protection with the following code: … Read more