Question

我正在尝试为视图的transform属性设置动画。这是我的代码：

CAKeyframeAnimation *shakeAnimation = [CAKeyframeAnimation animationWithKeyPath:@"transform"];
NSArray *transformValues = [NSArray arrayWithObjects:
                        [NSValue valueWithCGAffineTransform:CGAffineTransformMakeRotation((3*M_PI)/8)],
                        [NSValue valueWithCGAffineTransform:CGAffineTransformMakeRotation(-((3*M_PI)/8))],
                        [NSValue valueWithCGAffineTransform:CGAffineTransformMakeRotation((3*M_PI)/8)],
                        [NSValue valueWithCGAffineTransform:CGAffineTransformMakeRotation(-((3*M_PI)/8))],
                        [NSValue valueWithCGAffineTransform:CGAffineTransformMakeRotation((3*M_PI)/8)],
                        [NSValue valueWithCGAffineTransform:CGAffineTransformMakeRotation(-((3*M_PI)/8))],
                        nil];

[shakeAnimation setValues:transformValues];

NSArray *times = [NSArray arrayWithObjects:[NSNumber numberWithFloat:0.16f],[NSNumber numberWithFloat:0.33f],[NSNumber numberWithFloat:0.49f],[NSNumber numberWithFloat:0.66f],[NSNumber numberWithFloat:0.82f], [NSNumber numberWithFloat:1.0f], nil];

[shakeAnimation setKeyTimes:times];

NSArray *timingFunctions = [NSArray arrayWithObjects:
[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut], 
[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut],
[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut], 
[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut], 
[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut], 
[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut], 
nil];

[shakeAnimation setTimingFunctions:timingFunctions];

shakeAnimation.fillMode = kCAFillModeForwards;
shakeAnimation.removedOnCompletion = NO;
shakeAnimation.duration = 1.0f;

[self.someView.layer addAnimation:shakeAnimation forKey:@"anim"];

出于某种原因，每当我将方法animationWithKeyPath:的参数设置为“transform”时，我都会收到错误。我已经尝试了半个小时来调试这个，但找不到错误。我最初虽然在UIView的转换属性上执行动画是不允许的，但我知道我可以做这样的事情：

aView.transform = CGAffineTransformMakeRotation(M_PI/2);

先谢谢。

Answer 1

图层transform属性的值是CATransform3D，而不是CGAffineTransform。

此外，您可能会发现为transform.rotation.z密钥路径设置动画更加简单。该值只是CGFloat，因此您根本不必创建变换矩阵。

“Modifying a Transform Using Key Paths” in Core Animation Programming Guide
“Key Path Support for Structure Fields” in Core Animation Programming Guide

CAKeyframeAnimation键盘错误

1 个答案: