带旋转动画的CALayer [英] CALayer with rotation animation

问题描述

我屏蔽了这样的图像：

UIView *maskImage; maskImage = [[UIView alloc] init];
maskImage.backgroundColor = UIColorFromRGB(FTRMaskColor);
maskImage.frame = newFrame;

CALayer *theLayer = [CALayer layer];
theLayer.contents = (id)[[UIImage imageNamed:@"image.png"] CGImage];
theLayer.frame = newFrame;

maskImage.layer.mask = theLayer;

它工作正常但主要问题是如果我要旋转我的Ipad，旋转动画视图或图层（我不是很确定）不起作用。它旋转没有动画。你能帮帮忙吗？

It works fine but the main problem is if I want to rotate the my Ipad, the rotation animation of the view or the layer (I'm not very sure) doesn't work. It rotates without animation. Could you help, please?

推荐答案

旋转 CALayer ：

NSNumber *rotationAtStart = [myLayer valueForKeyPath:@"transform.rotation"];
CATransform3D myRotationTransform = CATransform3DRotate(myLayer.transform, myRotationAngle, 0.0, 0.0, 1.0);
myLayer.transform = myRotationTransform;        
CABasicAnimation *myAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation"];
myAnimation.duration = kMyAnimationDuration;
myAnimation.fromValue = rotationAtStart;
myAnimation.toValue = [NSNumber numberWithFloat:([rotationAtStart floatValue] + myRotationAngle)];
[myLayer addAnimation:myAnimation forKey:@"transform.rotation"];

myRotationAngle 应该是弧度。逆时针旋转使用负值，顺时针使用正值。

myRotationAngle should be in radians. Use negative values for counter-clockwise rotation and positive values for clockwise.

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