在iPhone中动画过度非常简单.
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首先获取当前的图形上下文:
CGContextRef context = UIGraphicsGetCurrentContext();
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接着设置一些动画属性用于开始动画:
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[UIView beginAnimations:nil context:context];[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];[UIView setAnimationDuration:1.0];?
然后设置想要过度的对象的最终状态.
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[big setFrame:SMALLRECT];[big setAlpha:0.5];[little setFrame:BIGRECT];[little setAlpha:1.0];
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最后提交动画,这样一个动画就会自动生成了
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[UIView commitAnimations];
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其中,setAnimationCurve是设置动画的方式,他有下面集中方式:
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- UIViewAnimationCurveEaseInOut ?//开始和结束时动画效果比较慢
- UIViewAnimationCurveEaseIn ? ? ? //开始动画效果比较慢
- UIViewAnimationCurveEaseOut ? ? //结束动画效果比较慢
- UIViewAnimationCurveLinear ? ? ? ? //平滑的动画效果
而,setAnimationDuration则是设置动画的持续时间.
下面是两个UIView之间的动画过度
// Start Animation Block //CGContextRef context = UIGraphicsGetCurrentContext(); CGContextRef context = nil; [UIView beginAnimations:nil context:context]; [UIView setAnimationTransition: UIViewAnimationTransitionFlipFromLeft forView:[self superview] cache:YES]; [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut]; [UIView setAnimationDuration:1.0]; // Animations [[self superview] exchangeSubviewAtIndex:0 withSubviewAtIndex:1]; // Commit Animation Block [UIView commitAnimations];
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页面之间的过度主要依靠UIView setAnimationTransition: forView: cache: 这个方法以及 exchangeSubviewAtIndex:withSubviewAtIndex:
前者通过UIView静态方法设置过度的动画种类,后者实现真正的过度函数掉用.种类有如下五种:
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typedef enum { UIViewAnimationTransitionNone, UIViewAnimationTransitionFlipFromLeft, UIViewAnimationTransitionFlipFromRight, UIViewAnimationTransitionCurlUp, UIViewAnimationTransitionCurlDown,} UIViewAnimationTransition;??
除了这种简单的动画方式外,其实还有一种利用QuartzCore来做过度动画.不同的地方在于,这个过度动画作用于层,换句话说,他动画直接做用于整个UIView,而不像UIView的动画,可以作用于UIView局部或本身.当UIView作用与本身时,实际上也就相当于是对层的动画了.
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CATransition *animation = [CATransition animation]; [animation setDelegate:self]; [animation setDuration:1.0f]; [animation setTimingFunction:UIViewAnimationCurveEaseInOut]; [animation setType: kCATransitionMoveIn]; [animation setSubtype: kCATransitionFromBottom]; [[self superview] exchangeSubviewAtIndex:0 withSubviewAtIndex:1]; [[[self superview] layer] addAnimation:animation forKey:@"transitionViewAnimation"];?
setDuration:和UIView中的动画效果一样,持续时间.
setTimingFunction:是动画的种类,和UIView一样,比如匀速动画,快速开始结束等.
setType:是指定动画的类型,他有:
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- kCATransitionFade (淡入淡出来补给动画)
- kCATransitionMoveIn(从一个方向覆盖的方式来补给动画)
- kCATransitionPush(推送的方式来补给动画)
- kCATransitionReveal(一个试图展现出另外另外一个试图的方式)
当除了第一种方式外(淡入淡出),可以通过setSubType:来制定动画的方向(因为这些动画都是直接着用于层的,所以相当于只有试图间的切换过渡).动画方向有4个:
- kCATransitionFromRight
- kCATransitionFromLeft
- kCATransitionFromTop
- kCATransitionFromBottom
除此之外,还存在一些未公开的动画方式,这些方式有些不能在模拟器中看到效果,但是真机可行.
// Curl the image up or down. This runs only on the iPhone and will not // produce any effect from the simulator CATransition *animation = [CATransition animation]; [animation setDelegate:self]; [animation setDuration:1.0f]; [animation setTimingFunction:UIViewAnimationCurveEaseInOut]; [animation setType:(notCurled ? @"pageCurl" : @"pageUncurl")]; /* mapCurl, mapUncurl pageCurl, pageUncurl suckEffect, spewEffect, cameraIris, cameraIrisHollowOpen, cameraIrisHollowClose genieEffect, unGenieEffect, rippleEffect, twist, tubey, swirl, charminUltra zoomIn, zoomOut oglFlip */ //让他不给删除掉 [animation setRemovedOnCompletion:NO]; [animation setFillMode: @"extended"]; [animation setRemovedOnCompletion: NO]; notCurled = !notCurled; [[[self.view viewWithTag:TOP_LAYER_VIEW] layer] addAnimation:animation forKey:@"pageFlipAnimation"];?
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