UIView 动画 依赖与 CALayer的证据

- (nullable id<CAAction>)actionForLayer:(CALayer *)layer forKey:(NSString *)event

Layer:

-(void)addAnimation:(CAAnimation *)anim forKey:(NSString *)key

{

[super addAnimation:anim forKey:key];

}

View:

+ (Class)layerClass

{

return [XLayer class];

}

[UIView beginAnimations:@"xx" context:nil];

[UIView setAnimationDuration:2];

[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];

[UIView setAnimationDelegate:self];

pView.frame = CGRectMake(120, 180, 40, 40);

[UIView commitAnimations];