如何更改UIAlertController的背景颜色？ [英] How to change the background color of the UIAlertController?

问题描述

由于UIActionSheet在iOS 8中的奇怪行为，我已经将UIAlertController与UIAction一起实现为按钮。我想改变UIAlertController的整个背景。但是我找不到任何办法。

Due to strange behavior of UIActionSheet in iOS 8, I have implemented UIAlertController with UIAction as buttons in it. I would like to change the entire background of the UIAlertController. But I can't find any ways to do it.

甚至尝试过，

actionController.view.backgroundColor = [UIColor blackColor];

但是没有帮助我。关于这方面的任何意见都会很明显。

But didn't help me out. Any inputs on this regard will be appreciable.

提前致谢。

推荐答案

你必须深入了解一些观点：

You have to step some views deeper:

let subview = actionController.view.subviews.first! as UIView
let alertContentView = subview.subviews.first! as UIView
alertContentView.backgroundColor = UIColor.blackColor()

也许你想保留原始角半径：

And maybe you want to keep original corner radius:

 alertContentView.layer.cornerRadius = 5;

抱歉Swifting但我不熟悉Objective -C。我希望它类似。

Sorry for the "Swifting" but i'm not familiar with Objective-C. I hope that's similar.

当然，更改动作的标题颜色也很重要。不幸的是我不知道，如何分别设置动作的颜色。但是，这是如何更改所有按钮文本颜色：

Of course it's also important to change the title color of the actions. Unfortunately I don't know, how to set the color of actions separately. But this is, how you change all button text colors:

actionController.view.tintColor = UIColor.whiteColor();

编辑：

角落半径自从这个答案发布以来， UIAlertController 已经改变了！替换它：

The corner radius of the UIAlertController has changed since this answer's been posted! Replace this:

 alertContentView.layer.cornerRadius = 5;

到此：

 actionContentView.layer.cornerRadius = 15

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