淡入/溶解改变的UIImageView的图像时， [英] Fade/dissolve when changing UIImageView's image

问题描述

而不是创建两个的UIImageViews ，它似乎是合乎逻辑简单地改变一个视图的图片。如果我这样做，反正是有具有两个图像之间的淡入/交叉解散，而不是瞬间切换的？

Rather than creating two UIImageViews, it seems logical to simply change the image of one view. If I do that, is there anyway of having a fade/cross dissolve between the two images rather than an instant switch?

推荐答案

编辑：有来自 @algal一个更好的解决方案下面。

there is a better solution from @algal below.

另一种方式做，这是通过使用predefined CAAnimation转换：

Another way to do this is by using predefined CAAnimation transitions:

CATransition *transition = [CATransition animation];
transition.duration = 0.25;
transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
transition.type = kCATransitionFade;
transition.delegate = self;
[self.view.layer addAnimation:transition forKey:nil];
view1.hidden = YES;
view2.hidden = NO;

请参阅苹果的视图过渡示例项目：<一href=\"http://developer.apple.com/library/ios/#sample$c$c/ViewTransitions/Introduction/Intro.html#//apple_ref/doc/uid/DTS40007411\">http://developer.apple.com/library/ios/#sample$c$c/ViewTransitions/Introduction/Intro.html#//apple_ref/doc/uid/DTS40007411

See the View Transitions example project from Apple: http://developer.apple.com/library/ios/#samplecode/ViewTransitions/Introduction/Intro.html#//apple_ref/doc/uid/DTS40007411

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