iOS如何使透视视图的子视图不透明？ [英] iOS how to make subview of a transparent view opaque?

问题描述

我有一个视图作为另一个视图的子视图，然后我将父视图的alpha值设置为0.5，但这也使得子视图即使其alpha值设置为1也是透明的。所以我该如何制作子视图的父视图的alpha值小于1时非透明（不透明）吗？

I have a view as the subview of another view, then I set the alpha value of the father view something like 0.5, but this also makes the subview transparent even when its alpha value is set to 1. So how can I make the subview non-transparent(opaque) when its father view has an alpha value less than 1?

推荐答案

离你最近的那个得到的是 colorWithAlphaComponent：。使用类似下面的内容，您可以设置父视图背景的alpha分量，它不会影响子视图。

The closest you're going to get is colorWithAlphaComponent:. Using something like the following, you can set the alpha component of the parent view's background, and it won't affect subviews.

[yourSuperview setBackgroundColor:[[UIColor blackColor] colorWithAlphaComponent:0.5]];

这篇关于iOS如何使透视视图的子视图不透明？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！