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    <p>Hey I had stumbled upon the same thing in my game, and ended up finding a somewhat different solution than you, which you may like :) I figured I should share the workaround I found...</p> <p>My case is using UIView/UIImageView animations, but it's basically still CAAnimations at its core... The gist of my method is that I copy/store the current animation on a view, and then let Apple's pause/resume work still, but before resuming I add my animation back on. So let me present this simple example:</p> <p>Let's say I have a UIView called <em>movingView</em>. The UIView's center is animated via the standard [<em>UIView animateWithDuration...</em>] call. Using the mentioned <strong>QA1673</strong> code, it works great pausing/resuming (when not exiting the app)... but regardless, I soon realized that on exit, whether I pause or not, the animation was completely removed... and here I was in your position.</p> <p>So with this example, here's what I did:</p> <ul> <li>Have a variable in your header file called something like <em>animationViewPosition</em>, of type *CAAnimation**.</li> <li><p>When the app exits to background, I do this:</p> <pre><code>animationViewPosition = [[movingView.layer animationForKey:@"position"] copy]; // I know position is the key in this case... [self pauseLayer:movingView.layer]; // this is the Apple method from QA1673 </code></pre> <ul> <li>Note: Those 2 ^ calls are in a method that is the handler for the <em>UIApplicationDidEnterBackgroundNotification</em> (similar to you)</li> <li>Note 2: If you don't know what the key is (of your animation), you can loop through the view's layer's '<em>animationKeys</em>' property and log those out (mid animation presumably).</li> </ul></li> <li><p>Now in my <em>UIApplicationWillEnterForegroundNotification</em> handler:</p> <pre><code>if (animationViewPosition != nil) { [movingView.layer addAnimation:animationViewPosition forKey:@"position"]; // re-add the core animation to the view [animationViewPosition release]; // since we 'copied' earlier animationViewPosition = nil; } [self resumeLayer:movingView.layer]; // Apple's method, which will resume the animation at the position it was at when the app exited </code></pre></li> </ul> <p>And that's pretty much it! It has worked for me so far :)</p> <p>You can easily extend it for more animations or views by just repeating those steps for each animation. It even works for pausing/resuming UIImageView animations, ie the standard [<em>imageView startAnimating</em>]. The layer animation key for that (by the way) is "contents".</p> <p><strong>Listing 1 Pause and Resume animations.</strong></p> <pre><code>-(void)pauseLayer:(CALayer*)layer { CFTimeInterval pausedTime = [layer convertTime:CACurrentMediaTime() fromLayer:nil]; layer.speed = 0.0; layer.timeOffset = pausedTime; } -(void)resumeLayer:(CALayer*)layer { CFTimeInterval pausedTime = [layer timeOffset]; layer.speed = 1.0; layer.timeOffset = 0.0; layer.beginTime = 0.0; CFTimeInterval timeSincePause = [layer convertTime:CACurrentMediaTime() fromLayer:nil] - pausedTime; layer.beginTime = timeSincePause; } </code></pre>
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    1. PORestoring animation where it left off when app resumes from background
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    1. USHashem Aboonajmi
    1. UScclogg
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    1. COExcellent solution! Worked like a charm. Thanks.
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      1. USHeiberg
    2. COAwesome, glad it helped someone. I should mention if you are pausing a view and its subview (for instance, a container view moving position, with an imageview inside it animating), you have to copy and re-add BOTH animations, but you only have to pause/resume (using QA1673) the superview... and it'll apply it to all subviews... if that makes sense.
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    3. CO+100 Great stuff man! Thanks.
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