view的hidden = yes和alpha = 0.0f之间有什么区别 [英] what's the difference between view's hidden = yes and alpha = 0.0f

问题描述

我有一个关于 UIView 的问题，隐藏的视图，alpha和opaque之间有什么区别？

I have a question about UIView, what's the difference between views hidden, alpha and opaque?

设置视图的效果：hidden = yes和view.alpha = 0.0f是相同的。

The effect of setting view: hidden = yes and view.alpha = 0.0f is the same.

推荐答案

差异很微妙。
根据 UIView类参考：

• opaque 告诉系统视图没有透明度并且因此可以更快地渲染，因为可以跳过混合计算


• 隐藏是布尔属性，仅更改当前视图的可见性并将其隐藏在ui事件中。


• alpha 是一个可动画的属性

• opaque tells the system that the view has no transparency and is thus faster to render because calculations for blending can be skipped
• hidden is boolean property that changes only the visibility of the current view and hides it from ui events.
• alpha is an animatable property

设置 alpha = 0.0f 或 hidden = YES 具有相同的视觉效果。
但是使用隐藏来实际隐藏视图不仅在图形意义上而且从ui事件中隐藏视图可能会在你有大量嵌套时产生更有效的响应链观点。

Setting alpha = 0.0f or hidden = YES has the same visual effect. However using hidden to actually hide a view not only in a graphical sense but also from ui events might result in a more efficient responder chain when you have lots of nested views.

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