在视图中淡入淡出 UIButton

问题描述

在我的 iPad 应用程序中，我需要显示出版物的封面图片.用户可以点击封面以获取详细信息.

In my iPad app I need to display cover-Images of publications. The user can tap on a cover to get details.

我考虑过将 UIButtons 渲染为自定义按钮，并将封面图像作为背景图像.是否可以淡入淡出 UIButtons?用户可以选择要显示的出版物的类别，然后他更改我想要淡出一些出版物的类别.

I thought about rendering UIButtons as custom buttons with the cover image as Background-image. Is it possible to fade UIButtons in and out? The user can choose a category of publications to be displayed, and ih he changes the category I wanted to fade some publications out.

推荐答案

任何 UIView 的 alpha 属性(包括 UIButton)可以使用基于块的动画方法进行动画处理:

The alpha property of any UIView (which includes a UIButton) can be animated using the block-based animations method:

[UIView animateWithDuration:0.25 animations:^{myButton.alpha = 0.0;}];

这将使您的按钮在 0.25 秒内淡出.将 alpha 设置为 1.0 以再次淡入.

This will fade your button out over a 0.25 second period. Set the alpha to 1.0 to fade it back in again.

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