UIAlertController更改操作表的“取消"按钮的背景颜色 [英] UIAlertController change background color of Cancel button for action sheet

问题描述

我正在尝试使用操作表样式创建UIAlertController，但是我想将背景色更改为灰色.我已经能够找到一种方法来更改UIAlertController的背景颜色，但不能更改取消"按钮.单独的取消"按钮保持白色.

I am trying to create a UIAlertController with the action sheet style but I want to change the background color to a gray color. I have been able to find a way to change the background color of the UIAlertController, but not the Cancel button. The Cancel button, which is separate, remains white.

这是我现在拥有的代码:

This is the code that I have right now:

UIAlertController *alert = [UIAlertController alertControllerWithTitle:nil message:nil preferredStyle:UIAlertControllerStyleActionSheet];

[alert addAction:[UIAlertAction actionWithTitle:@"Option 1" style:UIAlertActionStyleDefault handler:nil]];
[alert addAction:[UIAlertAction actionWithTitle:@"Option 2" style:UIAlertActionStyleDefault handler:nil]];
[alert addAction:[UIAlertAction actionWithTitle:@"Option 3" style:UIAlertActionStyleDefault handler:nil]];
[alert addAction:[UIAlertAction actionWithTitle:@"Delete" style:UIAlertActionStyleDestructive handler:nil]];

[alert addAction:[UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleCancel handler:nil]];

UIView *firstSubview = alert.view.subviews.firstObject;
UIView *alertContentView = firstSubview.subviews.firstObject;

for (UIView *subSubView in alertContentView.subviews) {
    subSubView.backgroundColor = [UIColor darkGrayColor]; // Here you change background
}

alert.view.tintColor = [UIColor whiteColor];

[self.controller presentViewController:alert animated:YES completion:nil];

这给了我以下结果: 链接

And this gives me the following result: Link

我已经访问过>如何更改UIAlertController? ，但没有一种解决方案的取消"按钮的背景具有自定义颜色.

I have visited How to change the background color of the UIAlertController? but none of the solutions have a custom color for the background of the Cancel button.

任何帮助将不胜感激！

推荐答案

您不能更改默认取消按钮样式的颜色.您需要为取消"按钮创建一个自定义视图控制器，并将其设置为取消警报"操作的内容视图控制器.这样可以将取消按钮分开保存

You cannot change color of a default cancel button style. You need to create a custom view controller for the cancel button and set it as a content view controller of a cancel alert action. This way keeps the cancel button separately

let alertController = UIAlertController(title: nil, message: nil, preferredStyle: .actionSheet)

alertController.addAction(UIAlertAction(title: "Option 1", style: .default, handler: nil))
alertController.addAction(UIAlertAction(title: "Option 2", style: .default, handler: nil))
alertController.addAction(UIAlertAction(title: "Option 3", style: .default, handler: nil))

alertController.addAction(UIAlertAction(title: "Delete", style: .destructive, handler: nil))

if let firstSubview = alertController.view.subviews.first, let alertContentView = firstSubview.subviews.first {
    for view in alertContentView.subviews {
        view.backgroundColor = .darkGray
    }
}

alertController.view.tintColor = .white

let cancelButtonViewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "CancelButtonViewController")
let cancelAction = UIAlertAction(title: "", style: .cancel, handler: nil)
cancelAction.setValue(cancelButtonViewController, forKey: "contentViewController")

alertController.addAction(cancelAction)

present(alertController, animated: true, completion: nil)

这篇关于UIAlertController更改操作表的“取消"按钮的背景颜色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！