StackOverflow2013

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POImproving Smoothness of Simple Animations
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copied!<p>I am developing my first iPhone application, and I have made it past the "machinery" and now I am wrapping up fit & finish details.</p> <p>I have a view that slides in from the bottom of the screen for my settings pane. The view itself has an opacity of 0, and has a UIImageView view inside of it with a PNG creating the actual background for the view, behind the controls. I am using the built in animation calls for UIView, as in;</p> <pre><code>[self.view addSubview:settingsViewController.view]; [UIView beginAnimations:nil context:nil]; [UIView setAnimationDuration:0.5]; [UIView setAnimationCurve:UIViewAnimationCurveEaseOut]; frame.origin.y = 200.0; settingsViewController.view.frame = frame; [UIView commitAnimations]; </code></pre> <p>Unfortunately, the animation on the device is choppy. The PNG I am using as my background is transparent only in the uppermost 30 pixels across it's width. If I use a PNG with no transparency, the animation is smooth.</p> <p>The application itself is highly graphical, so the view is animating out over top of a screen full of other PNGs.</p> <p>I would be extremely surprised if the device can't handle this type of animation smoothly, which leads me to believe I need to refine my approach. Thoughts I had so far include;</p> <p>Perhaps I need to use Core Animation directly? Would caching the view behind the settings pane before animating be beneficial somehow?</p> <p>This is new territory for me, and I know there must be ways to optimize that are considered good practice. Thanks for your time!</p>

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