UIView 自带动画

[UIView beginAnimations:nil context:nil];
//设置动画时间
[UIView setAnimationDuration:1];
view.backgroundColor = [UIColor cyanColor];
[UIView commitAnimations];

[UIView animateWithDuration:1 animations:^{
//在这个代码内，写动画效果
view.transform = CGAffineTransformMakeRotation(M_PI_2);
}];

[UIView animateWithDuration:2 animations:^{
view.transform = CGAffineTransformMakeScale(1,1);
} completion:^(BOOL finished) {
//当动画执行结束的时候，执行这个代码块
NSLog(@"动画结束了,调用了这个代码块");
}];