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POpausing and resuming core animation when app enters and exits background
 

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    <p>I have a simple CABasicAnimation wired up as an infinite animation (I have a wheel that I keep rotating forever). Here is the method where I setup that explicit animation:</p> <pre><code>-(void)perform360rotation:(UIImageView*) imageView { CABasicAnimation* anim = [CABasicAnimation animationWithKeyPath:@"transform.rotation"]; // to rotate around a specific axis, specify it in the KeyPath parameter like below //CABasicAnimation* anim = [CABasicAnimation animationWithKeyPath:@"transform.rotation.x"]; [anim setDuration:self.speed]; // Animation duration [anim setAutoreverses:NO]; [anim setRepeatCount:HUGE_VALF]; // Perfrom animation large number of times [anim setFromValue:[NSNumber numberWithDouble:0.0f]]; [anim setToValue:[NSNumber numberWithDouble:(M_PI * 2.0f)]]; [[imageView layer] addAnimation:anim forKey:@"wheeloRotation"]; } </code></pre> <p>I call this animtion method from my viewWillAppear method. When the app enters background and then re-appears, the animation does not Work anymore. Upon googling, I came up with <a href="http://developer.apple.com/library/ios/#qa/qa1673/_index.html" rel="nofollow">this</a> from Apple. All fine, I implemented Apple's recommendations like this in the same viewcontroller.m file that has the perform360rotation method for rotating the view.</p> <pre><code>-(void)pauseLayer:(CALayer*)layer { CFTimeInterval pausedTime = [layer convertTime:CACurrentMediaTime() fromLayer:[self.wheelView layer]]; layer.speed = 0.0; layer.timeOffset = pausedTime; NSLog(@"pauseLayer:paused time = %f",pausedTime); } -(void)resumeLayer:(CALayer*)layer { CFTimeInterval pausedTime = [layer timeOffset]; NSLog(@"resumeLayer:paused time = %f",pausedTime); layer.speed = 1.0; layer.timeOffset = 0.0; layer.beginTime = 0.0; CFTimeInterval timeSincePause = [layer convertTime:CACurrentMediaTime() fromLayer:[self.wheelView layer]] - pausedTime; layer.beginTime = timeSincePause; } </code></pre> <p>Again, on googling, I saw that the general consensus was that I call the pause and resume methods from the AppDelegate. So I did them like this (lVC is the viewcontroller.m class that has I mentioned at the start of this question. The pauseLayer and resumeLayer methods are being called from inside its viewWillAppear and viewWillDisappear methods):</p> <pre><code>- (void)applicationDidEnterBackground:(UIApplication *)application { [lVC viewWillDisappear:YES]; } - (void)applicationWillEnterForeground:(UIApplication *)application { [lVC viewWillAppear:YES]; } </code></pre> <p>No dice yet. The animation still does not resume when app re-enters foreground. Is there something that I am doing wrong?</p>
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