[UIView animateWithDuration:2.0f animations:^{
self.imageView.myLayer.myProperty = 1;
}];
在-actionForKey：方法我需要返回动画,负责插值.当然,我必须以某种方式告诉动画如何检索动画的其他参数(即持续时间和计时功能).
- (id<CAAction>)actionForKey:(NSString *)event
{
if ([event isEqualToString:@"myProperty"])
{
CABasicAnimation *anim = [CABasicAnimation animationWithKeyPath:@"myProperty"];
[anim setFromValue:@(self.myProperty)];
[anim setKeyPath:@"myProperty"];
return anim;
}
return [super actionForKey:event];
}
}
有关如何实现这一点的任何想法？我尝试在图层属性中查找动画,但找不到任何有趣的内容.我也对图层动画有问题,因为actionForKey：在动画之外调用.
解决方法
Changing a view-owned layer is the same as changing the view itself,@H_403_16@ and any animations you apply to the layer’s properties respect the@H_403_16@ animation parameters of the current view-based animation block. The@H_403_16@ same is not true for layers that you create yourself. Custom layer@H_403_16@ objects ignore view-based animation block parameters and use the@H_403_16@ default Core Animation parameters instead.
If you want to customize the animation parameters for layers you@H_403_16@ create,you must use Core Animation directly.
此外,文档声称UIView仅支持一组有限的可动画属性@H_403_16@哪个是：
>框架@H_403_16@>界限@H_403_16@>中心@H_403_16@>变换@H_403_16@>阿尔法@H_403_16@> backgroundColor@H_403_16@> contentStretch
Views support a basic set of animations that cover many common tasks.@H_403_16@ For example,you can animate changes to properties of views or use@H_403_16@ transition animations to replace one set of views with another.
Table 4-1 lists the animatable properties—the properties that have@H_403_16@ built-in animation support—of the UIView class.
你必须为此创建一个CABasicAnimation.
如果在actionForKey中返回CABasicAnimation,则可以使用CATransactions进行某种解决方法：就像那样
[UIView animateWithDuration:duration animations:^{
[CATransaction begin];
[CATransaction setAnimationDuration:duration];
customLayer.myProperty = 1000; //whatever your property takes
[CATransaction commit];
}];
- (id<CAAction>)actionForKey:(NSString *)event
{
if ([event isEqualToString:@"myProperty"])
{
return [CABasicAnimation animationWithKeyPath:event];
}
return [super actionForKey:event];
}
Github有一些东西,如果你不想看看：https://github.com/iMartinKiss/UIView-AnimatedProperty
