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    <p>Animation with UIKit of UIViews is much more limited than using Core Animation directly. In particular what you are trying to animate is not one of animatable properties of a UIView. In addition as clarified in the <a href="http://developer.apple.com/library/ios/#documentation/WindowsViews/Conceptual/ViewPG_iPhoneOS/AnimatingViews/AnimatingViews.html#//apple_ref/doc/uid/TP40009503-CH6-SW2" rel="nofollow">View Programming Guide for iOS</a>:</p> <blockquote> <p><strong>Note:</strong> If your view hosts custom layer objects—that is, layer objects without an associated view—you must use Core Animation to animate any changes to them.</p> </blockquote> <p>This is the case in your example. You have added a CALayer to your view and UIKit will not be able to animate the result for you. On the other hand you can use Core Animation directly to animate the motion of your mask layer. You should be able to do this easily using implicit animation as described in the <a href="https://developer.apple.com/library/ios/documentation/Cocoa/Conceptual/CoreAnimation_guide/CreatingBasicAnimations/CreatingBasicAnimations.html#//apple_ref/doc/uid/TP40004514-CH3-SW1" rel="nofollow">Core Animation Programming Guide</a>. Please note that from the list of <a href="https://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/CoreAnimation_guide/Articles/AnimProps.html#//apple_ref/doc/uid/TP40005942-SW1" rel="nofollow">CALayer Animatable Properties</a> that frame is not animatable. Instead you should use <code>position</code>.</p>
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    1. POHow to animate a CALayer attached to UIImageView?
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    1. POHow to animate a CALayer attached to UIImageView?
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    1. COThanks Torrey, what you are saying makes totally sense and is also proven by the docs. Unfortunately, I still can't get it to work. I am now using "self.menuMask.position = CGPointMake(-320.0, 0.0);" to move the mask layer to the left. I added additional code I am using in my previous post.
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    2. CODo you see any change at all when you use `self.menuMask.position = CGPointMake(-320.0, 0.0)` to animate moving the mask? Note that this is not exactly what you want since `position` is the center point of the CALayer. So to completely move it out of the way you'll want `self.menuMask.position = CGPointMake(-320.0-44.0, 0.0)`. Still you should be able to see some effect from your animation if things are working.
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    3. CONothing, no animation. I assumed setting "self.menuMask.frame = CGRectMake(0, 0, 320.0, 88.0);" causes to mask to be of size 320.0 x 88.0, thus I assumed "self.menuMask.position = CGPointMake(-320.0, 0.0);" should do it. But anyway, no visible changes at all.
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