我正在尝试使用以下代码制作一个简单的CAKeyframeAnimation:
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
CALayer *rotLayer = [CALayer layer];
rotLayer.bounds = CGRectMake(0.0, 0.0, 100.0, 50.0);
rotLayer.anchorPoint = CGPointMake(0.5, 0.5);
rotLayer.position = CGPointMake(160.0, 200.0);
rotLayer.backgroundColor = [UIColor redColor].CGColor;
[self.view.layer addSublayer:rotLayer];
/*
CABasicAnimation *basic = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
basic.duration = 3.0;
basic.fromValue = [NSNumber numberWithFloat:0.0];
basic.toValue = [NSNumber numberWithFloat:2.0];
[rotLayer addAnimation:basic forKey:@"basic"];
*/
CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"transform.rotation.z"];
animation.duration = 3.0;
animation.keyTimes = @[ [NSNumber numberWithFloat:0.0], [NSNumber numberWithFloat:1.0] ];
animation.values = @[ [NSNumber numberWithFloat:0.0], [NSNumber numberWithFloat:2.0] ];
animation.timingFunctions = @[ [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear], [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear] ];
animation.fillMode = kCAFillModeForwards;
animation.removedOnCompletion = NO;
[rotLayer addAnimation:animation forKey:@"test"];
}
如果我使用基本动画而不是关键帧动画,一切都按预期工作,但是如果我在模拟器中运行此代码,它会崩溃并显示以下消息:
-[CAKeyframeAnimation _copyRenderAnimationForLayer:]: unrecognized selector sent to instance 0x7558870
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[CAKeyframeAnimation _copyRenderAnimationForLayer:]: unrecognized selector sent to instance 0x7558870'
这是一个启用 ARC 的新项目。即使将动画设置为属性也不起作用。QuartzCore框架也是链接。我做错了什么?
当我运行这段代码时,它工作得很好(一个红色矩形围绕位于矩形中心的锚点旋转)。
你确定你正确地链接了QuartzCore框架吗?您是否将<QuartzCore/QuartzCore.h>
导入到您的实现文件中?看起来_copyRenderAnimationForLayer:
是苹果内部的方法,所以我并不质疑它的存在。但是,如果尚未正确链接或导入文件,则应用程序将不知道该方法存在,然后引发您看到的异常。