UIView的不透明度和alpha是否相同 [英] Is the opacity and alpha the same thing for UIView

问题描述

我想使用动画来改变UIView的颜色以使其淡化，但是，不知怎的，我无法访问和设置不透明度，但我可以设置alpha。我想知道alpha和不透明度是否相同？在网上搜索，我没有找到一个好的答案。非常感谢您的帮助！

I want to use animation to change UIView's color to make it fade, however, somehow i can't access and set opacity, but i can set alpha. I wonder if alpha and opacity are the same? Search on the web and I didnt find a good answer. Thanks a lot for your help!

推荐答案

实际上不透明度是指<$ c $的alpha-channel值 C>的UIView 。当视图完全不透明时，这意味着它的 alpha = 1 ，当视图完全透明（非不透明）时，其 alpha = 0 。

Actually "opacity" means "value of alpha-channel" of your UIView. When a view is fully opaque this means its alpha = 1, when a view is fully transparent (non-opaque) its alpha = 0.

关于 CALayer 和 UIView 在Cocoa中，是的，它们提供相同的功能。

As about properties of CALayer and UIView in Cocoa, yes, they provide the same functionality.

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