使用淡入淡出动画重绘一个UIView？

问题描述

在 TwUI 中，在 TUIView 上有一个名为 redraw 的方法$ c>。它强制视图重绘，但它也带来了新的视图状态之间的自由褪色动画。

In TwUI, there is a method called redraw on TUIView. It forces the view to redraw, but it also comes with a free fading animation between the old and new state of the view.

我想知道如果这样的东西可能在正常 UIView 中。基本上，如何在旧状态和新状态之间重新绘制视图（ setNeedsDisplay ）？

I'm wondering if something like that is possible in a normal UIView. Basically, how can I redraw the view (setNeedsDisplay) with a fading animation between the old and the new states?

推荐答案

使用使用 + [UIView transitionWithView：duration：options：animations：complete：] code>选项，并在动画块中强制视图的图层立即重绘其内容。

Use +[UIView transitionWithView:duration:options:animations:completion:] with the UIViewAnimationOptionTransitionCrossDissolve option, and inside the animation block, force the view's layer to redraw its contents immediately.

[myView setNeedsDisplay];
[UIView transitionWithView:myView duration:1
    options:UIViewAnimationOptionTransitionCrossDissolve
    animations:^{
        [myView.layer displayIfNeeded];
    } completion:nil];

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