- (void)viewDidLoad {
[super viewDidLoad];
UIView *view = [[UIView alloc] initWithFrame:CGRectMake(100, 20, 30,30)];
view.backgroundColor= [UIColor orangeColor];
[self.view addSubview:view];
//__bridge桥接因为context参数是void*类型,而view是UIView类型,不匹配,所以使用__bridge桥接进行类型匹配
[UIView beginAnimations:nil context:(__bridgevoid*)(view)];
[UIView setAnimationDuration:2];
//设置代理
[UIView setAnimationDelegate:self];
//绑定方法
[UIView setAnimationDidStopSelector:@selector(animationDidStop:finished:context:)];
view.frame=CGRectMake(200, 200, 50, 50);
[UIView commitAnimations];
}
//自己写的方法不能进行传参
//-(void)change:(UIView *)view
//系统提示的方法没有context这个参数,所以也不能传参
//-(void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag
//这个方法是在setAnimationDidStopSelector这个方法定义的时候给的,系统把它注释了,需要传参数时把它复制出来用就可以了
- (void)animationDidStop:(NSString*)animationID finished:(NSNumber*)finished context:(void*)context {
//把参数context转换为UIView类型的对象
UIView *view = (__bridgeUIView*)context;
// NSLog(@"view");
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:2];
view.backgroundColor= [UIColor blueColor];
[UIView commitAnimations];
}
