UIAlertController 更改操作表的取消按钮的背景颜色

debugcn 发表于 Dev

铅弹

我正在尝试使用操作表样式创建 UIAlertController，但我想将背景颜色更改为灰色。我已经能够找到一种方法来更改 UIAlertController 的背景颜色，但不是“取消”按钮。单独的取消按钮保持白色。

这是我现在拥有的代码：

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

我已经访问了如何更改 UIAlertController 的背景颜色？但没有一个解决方案具有用于取消按钮背景的自定义颜色。

任何帮助，将不胜感激！

极客1706

您无法更改默认取消按钮样式的颜色。您需要为取消按钮创建自定义视图控制器，并将其设置为取消警报操作的内容视图控制器。这种方式可以单独保留取消按钮

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)