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iPhone动画翻页中途停留的效果实现

看了很多例子的CurlUp和CurlDown，都是翻页效果，没有像地图那样翻到一半停下的，偶然在网上看到了方法，自己做了一个例子，不敢独享，拿出来大家看一下。

- (IBAction)curlUp{ 
    NSLog(@"Curl"); 
    // Curl the image up or down 
    CATransition *animation = [CATransition animation]; 
    [animation setDelegate:self]; 
    [animation setDuration:0.35]; 
    [animation setTimingFunction:UIViewAnimationCurveEaseInOut]; 
    if (!curled){ 
        animation.type = @"pageCurl"; 
        animation.fillMode = kCAFillModeForwards; 
        animation.endProgress = 0.58; 
    } else { 
        animation.type = @"pageUnCurl"; 
        animation.fillMode = kCAFillModeBackwards; 
        animation.startProgress = 0.42; 
    } 
    [animation setRemovedOnCompletion:NO]; 
    [view exchangeSubviewAtIndex:0 withSubviewAtIndex:1]; 
     
    [view addAnimation:animation forKey:@"pageCurlAnimation"]; 
     
    // Disable user interaction where necessary 
    if (!curled) { 
         
    } else { 
         
    } 
     
    curled = !curled; 
}