在iOS8上CGAffineTransform动画看起来比在iOS7不同

问题描述

我试图找到一个原因的UIView 动画变换属性的iOS 8看起来不同于iOS的6/7。

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

的举个简单的例子，之前到iOS 8：的

myView.transform = CGAffineTransformRotate(CGAffineTransformIdentity, 1.57);
[UIView animateWithDuration:5 animations:^{
    myView.transform = CGAffineTransformTranslate(plane.transform, 100, 0);
}];

给出了预期的结果，MyView的旋转90度，向下移动，但在iOS8上，当翻译动画它开始于我无法找到解释（它打破了动画）。

gives expected result, "myView" is rotated 90 degrees and moves down, but in iOS8 when translation is animated it starts at a point that I couldn't find explanation for (which breaks the animation).

有谁知道它的解释？在此先感谢！

Does anyone know the explanation for it? Thanks in advance!

推荐答案

CGAffineTransformIdentity行为不同的ios7和iOS8上。这与自动布局和大小班做。解决的办法是去除约束，与上ios7动画冲突

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
}

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