Animation of CGAffineTransform in iOS8 looks different than in iOS7

Question

I\'m trying to find a reason why animation of UIView transform property looks different in iOS 8 than iOS 6/7.

For a simple example, prior to iOS 8:

Answer 1

CGAffineTransformIdentity behaves differently on ios7 and ios8. This has to do with auto-layout and size classes. The solution is to remove constraints that conflict with the animation on ios7.

// solve the constraint-animation problem
if(NSFoundationVersionNumber <= NSFoundationVersionNumber_iOS_7_1) {
    // iOS7 remove constraints that conflict with animation
    if (self.centerYAlignment != nil) {
        self.view.removeConstraint(self.centerYAlignment) //is an IBOutlet 
    }
} else {
    // iOS8 constraint animations are fine
}