UIView 效果

[UIView beginAnimations:nil context:nil];
    [UIView    setAnimationCurve: UIViewAnimationCurveLinear];
    [UIView    setAnimationDelegate:self];
    [UIView    setAnimationDuration:2];
    [self.view setAlpha:0.0];
    [UIView commitAnimations];
   
   
    [UIView beginAnimations:nil context:nil];
    [UIView    setAnimationCurve: UIViewAnimationCurveLinear];
    [UIView    setAnimationDelegate:self];
    [UIView    setAnimationDuration:0.5];
    [self.view setAlpha:1.0];
   // [loginViewController.view setFrame:CGRectMake(0, 20, 320, 480)];
   // TODO:中间可以修改很多东西，在这个view范围内
   // 比如改变 scrollview 大小
   // scrollView.contentInset = UIEdgeInsetsMake(60.0f, 0.0f, 0.0f, 0.0f);
   // [self addChildViewController:loginViewController];
    [UIView commitAnimations];

如：
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:.3];
[scrollView setContentInset:UIEdgeInsetsMake(0.0f, 0.0f, 0.0f, 0.0f)];
[UIView commitAnimations];

CALayer 旋转效果：
CALayer *layer = [CALayer layer];
layer.frame = CGRectMake(25.0f, frame.size.height - 65.0f, 30.0f, 55.0f);
layer.contentsGravity = kCAGravityResizeAspect;
layer.contents = (id)[UIImage imageNamed:@"blueArrow.png"].CGImage;

[[self layer] addSublayer:layer];

[CATransaction begin];
[CATransaction setAnimationDuration:FLIP_ANIMATION_DURATION];
layer.transform = CATransform3DMakeRotation((M_PI / 180.0) * 180.0f, 0.0f, 0.0f, 1.0f);
 
[CATransaction commit];

把layer 加入到 UIView 里面，实现层的旋转动画效果。

摘自 diqun1314的专栏