下面代码段是关于ios View 淡入淡出效果的代码，希望能对各位也有好处。

- (void)TheAnimation{         animation.delegate = self;    animation.timingFunction = UIViewAnimationCurveEaseInOut;         NSUInteger f = [[rView subviews] indexOfObject:fView];    NSUInteger z = [[rView subviews] indexOfObject:zView];    [rView exchangeSubviewAtIndex:z withSubviewAtIndex:f];         [[rView layer] addAnimation:animation forKey:@"animation"];     }