视图切换的动画效果

为了避免视图之间切换的呆板问题，在IPHONE中引入了转换动画效果，分别在UIKit.framework和QuartzCore.framework中，后者的动画类型要比前者丰富一些。

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下面的动画需要导入QuartzCore.framework库，并在实现文件中导入。
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#import <QuartzCore/QuartzCore.h>- (IBAction)switchViews:(id)sender{CATransition *animation = [CATransition animation];    animation.duration = 0.5f;    animation.timingFunction = UIViewAnimationCurveEaseInOut;animation.fillMode = kCAFillModeForwards;UIButton *theButton = (UIButton *)sender;switch (theButton.tag) {case 0:    /*动画效果       kCATransitionFade       kCATransitionMoveIn       kCATransitionPush       kCATransitionReveal*/animation.type = kCATransitionPush;/*动画方向       kCATransitionFromRight       kCATransitionFromLeft       kCATransitionFromTop       kCATransitionFromBottom    */animation.subtype = kCATransitionFromTop;break;case 1:animation.type = kCATransitionMoveIn;animation.subtype = kCATransitionFromTop;break;case 2:animation.type = kCATransitionReveal;animation.subtype = kCATransitionFromTop;break;case 3:animation.type = kCATransitionFade;animation.subtype = kCATransitionFromTop;break;default:break;}[self.view.layer addAnimation:animation forKey:@"animation"];}
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UIKit.framework中的动画是对UIView的，而QuartzCore.framework是针对视图的属性layer来实现的，后者与视图动画比起来，具备更大的优势，更容易进行转换，倾斜，放大，缩小等等。