使用preferredStyle：.ActionSheet更改UIAlertController中取消按钮的颜色

Question

是否可以将取消按钮的颜色更改为红色，我知道我们可以使用破坏性风格

  let cancelActionButton: UIAlertAction = UIAlertAction(title: "Cancel", style: .Destructive) { action -> Void in
            print("Cancel")
        }

但我想单独取消取消按钮，例如

Answer 1

let cancelAction = UIAlertAction(title: "Cancel", style: .cancel) 
cancelAction.setValue(UIColor.red, forKey: "titleTextColor")

Answer 2

这是如何像你说的那样发出警报的代码：

let alert = UIAlertController(title: "Hello", message: "Hello World", preferredStyle: .actionSheet)
alert.addAction(UIAlertAction(title: "Open in Google Maps", style: . default, handler: nil))
alert.addAction(UIAlertAction(title: "Open in Google", style: . default, handler: nil))
alert.addAction(UIAlertAction(title: "Copy Address", style: . default, handler: nil))

alert.addAction(UIAlertAction(title: "Cancel", style: .destructive, handler: nil))

你必须使用2种风格。 在这里，我使用了.destructive和.default，它将警报操作分为2部分

Answer 3

只需将按钮的style属性设置为破坏性。

let cancelAction = UIAlertAction(title: "Cancel", style: .destructive, handler: {
            (alert: UIAlertAction!) -> Void in

})

Answer 4

快捷键4

您可以使用以下代码更改警报操作按钮的color。

let cancelAction = UIAlertAction(title: "Cancel", style: .cancel, handler: nil)
cancelAction.setValue(UIColor.red, forKey: "titleTextColor")

希望这对您有所帮助。

Answer 5

Swift4.2

如果您有多个UIAlertAction，则可以在UIAlertAction中添加“取消” UIAlertController。

 let alert = UIAlertController(title: "Title", message: "Your Message", preferredStyle: UIAlertController.Style.actionSheet)
 alert.addAction(UIAlertAction(title: "first",style: .default, handler: { action in
     //Do something....           
   }))
 alert.addAction(UIAlertAction(title: "second", style: .default, handler: { action in
     //Do something....           
   }))
// Add cancel UIAlertAction
 let cancelAlert = UIAlertAction(title: "Cancel", style: .cancel, handler: nil)
     cancelAlert.setValue(UIColor.red, forKey: "titleTextColor")
     alert.addAction(cancelAction).  
     self.present(alert, animated: true, completion: nil)

Answer 6

在目标C中将样式从UIAlertActionStyleDefault更改为UIAlertActionStyleDestructive：

UIAlertAction* button = [UIAlertAction actionWithTitle:@"Button title here"
                                      style:UIAlertActionStyleDestructive
                                      handler:^(UIAlertAction * action)
                                      {
                                          // Handle action here....
                                      }];

Answer 7

如果要为取消按钮实现相同的输出，并且也不想将取消按钮的类型更改为破坏性的。我在代码中使用了取消类型作为“取消”按钮。为此，可以使用以下代码：-

 //MARK:- Function to create the action sheet

  func showAlertSheet(){

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

    // Create Google Map button
    let googleMap = UIAlertAction(title: "Open in Google Maps", style: .default) { (action:UIAlertAction!) in

        // Code in this block will trigger when OK button tapped.
        print("Ok button tapped");

    }
    alertController.addAction(googleMap)

    // Create Map button
    let map = UIAlertAction(title: "Open in Maps", style: .default) { (action:UIAlertAction!) in

        // Code in this block will trigger when OK button tapped.
        print("Ok button tapped");

    }
    alertController.addAction(map)

     // Create copy Address button
    let copyAddress = UIAlertAction(title: "Copy Address", style: .default) { (action:UIAlertAction!) in

        // Code in this block will trigger when OK button tapped.
        print("Ok button tapped");

    }
    alertController.addAction(copyAddress)

    // Create Cancel button
    let cancelAction = UIAlertAction(title: "Cancel", style: .cancel) { (action:UIAlertAction!) in
        print("Cancel button tapped");
    }
    // Change Cancel title color according to your requirements
    cancelAction.setValue(UIColor.red, forKey: "titleTextColor")

    alertController.addAction(cancelAction)

    // Present Dialog message
    self.present(alertController, animated: true, completion:nil)
}

您还可以选择更改取消按钮的文字颜色。代码的输出如下：-