ios Swift 如何更改 UIAlertController 的标题颜色

Swift How to change UIAlertController's Title Color

提问by Jonathan Soifer

How do I change the UIAlertController's Title font using Swift?

如何使用 Swift 更改 UIAlertController 的标题字体？

I'm not talking about the message color, I'm not talking about the buttons color.

我不是在谈论消息颜色，我不是在谈论按钮颜色。

I'm talking about the Title.

我说的是标题。

回答by pbush25

let attributedString = NSAttributedString(string: "Title", attributes: [
    NSFontAttributeName : UIFont.systemFontOfSize(15), //your font here
    NSForegroundColorAttributeName : UIColor.redColor()
])

let alert = UIAlertController(title: "", message: "",  preferredStyle: .alert)

alert.setValue(attributedString, forKey: "attributedTitle")

let cancelAction = UIAlertAction(title: "Cancel", style: .cancel) { (_) in
}

alert.addAction(cancelAction)

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

Added the correct line of code to my answer as it's much more concise than the answer below.

在我的答案中添加了正确的代码行，因为它比下面的答案简洁得多。

回答by Ignat

What push25 said is correct, only you have to use key-value coding in order to set the attributed string. (Thanks dupuis2387)

push25 说的是对的，只是你必须使用键值编码来设置属性字符串。（感谢dupuis2387）

    //Define a color
    let color = UIColor.redColor()

    //Make a controller
    let alertVC = UIAlertController(title: "Dont care what goes here, since we're about to change below", message: "", preferredStyle: UIAlertControllerStyle.Alert)

    //Title String
    var hogan = NSMutableAttributedString(string: "Presenting the great... Hulk Hogan!")

    //Make the attributes, like size and color
    hogan.addAttribute(NSFontAttributeName, value: UIFont.systemFontOfSize(40.0), range: NSMakeRange(24, 11))

    hogan.addAttribute(NSForegroundColorAttributeName, value: color, range: NSMakeRange(0, NSString(string: hogan.string).length))

    //Set the new title
    //Use "attributedMessage" for the message
    alertVC.setValue(hogan, forKey: "attributedTitle")

    //This will change the button color
    alertVC.view.tintColor = UIColor.orangeColor()

    //Make the button
    let button:UIAlertAction  = UIAlertAction(title: "Label text", style: UIAlertActionStyle.Default, handler: { (e:UIAlertAction!) -> Void in
        println("\(e)")
    })

    //You can add images to the button
    let accessoryImage:UIImage = UIImage(named: "someImage")!
    button.setValue(accessoryImage, forKey:"image")

    //Add the button to the alert
    alertVC.addAction(button)

    //Finally present it
    self.presentViewController(alertVC, animated: true, completion:  nil)

回答by user2643679

Alert(self, Title: “Hello”, TitleColor: UIColor.whiteColor(), Message: “World”, MessageColor: UIColor.whiteColor(), BackgroundColor: UIColor.blackColor(), BorderColor: UIColor.yellowColor(), ButtonColor: UIColor.yellowColor())
    func Alert(View: ViewController, Title: String, TitleColor: UIColor, Message: String, MessageColor: UIColor, BackgroundColor: UIColor, BorderColor: UIColor, ButtonColor: UIColor) {

    let TitleString = NSAttributedString(string: Title, attributes: [NSFontAttributeName : UIFont.systemFontOfSize(15), NSForegroundColorAttributeName : TitleColor])
    let MessageString = NSAttributedString(string: Message, attributes: [NSFontAttributeName : UIFont.systemFontOfSize(15), NSForegroundColorAttributeName : MessageColor])

    let alertController = UIAlertController(title: Title, message: Message, preferredStyle: .Alert)

    alertController.setValue(TitleString, forKey: "attributedTitle")
    alertController.setValue(MessageString, forKey: "attributedMessage")

    let okAction = UIAlertAction(title: "OK", style: .Default) { (action) in

    }

    let cancelAction = UIAlertAction(title: "Cancel", style: .Default, handler: nil)

    alertController.addAction(okAction)
    alertController.addAction(cancelAction)


    let subview = alertController.view.subviews.first! as UIView
    let alertContentView = subview.subviews.first! as UIView
    alertContentView.backgroundColor = BackgroundColor
    alertContentView.layer.cornerRadius = 10
    alertContentView.alpha = 1
    alertContentView.layer.borderWidth = 1
    alertContentView.layer.borderColor = BorderColor.CGColor


    //alertContentView.tintColor = UIColor.whiteColor()
    alertController.view.tintColor = ButtonColor

    View.presentViewController(alertController, animated: true) {
        // ...
    }
}

回答by Fabio

I construct this class:

我构造这个类：

class Alert {
class func showAlert(title: String, titleColor: UIColor, message: String, preferredStyle: UIAlertControllerStyle, titleAction: String, actionStyle: UIAlertActionStyle, vc: UIViewController) {

    let attributedString = NSAttributedString(string: title, attributes: [NSAttributedStringKey.font: UIFont.boldSystemFont(ofSize: 16), NSAttributedStringKey.foregroundColor: titleColor])
    let alert = UIAlertController(title: title, message: message, preferredStyle: preferredStyle)

    alert.setValue(attributedString, forKey: "attributedTitle")

    alert.addAction(UIAlertAction(title: titleAction, style: actionStyle, handler: nil))
    vc.present(alert, animated: true)
}

}

}

Usage

用法

Alert.showAlert(title: "yourTitle", titleColor: .yourcolor, message: "your message", preferredStyle: .alert, titleAction: "your title action", actionStyle: .yourActionStyle, vc: self)

Hope this help :)

希望这有帮助:)

回答by MrG

Here is for Swift 4 ++ also using a global instance for UIAlert

这是 Swift 4 ++ 也使用 UIAlert 的全局实例

func showAlertError(withTitle title: String, withMessage message: String) {
    var dialogTitle = title
    if dialogTitle.isEmpty { dialogTitle = "Error:" }


    let attributedString = NSAttributedString(string: dialogTitle, attributes: [
        NSAttributedString.Key.font : UIFont.systemFont(ofSize: 15),
        NSAttributedString.Key.foregroundColor : UIColor.red
        ])

    let alert = UIAlertController(title: "", message: message, preferredStyle: .alert)
    alert.setValue(attributedString, forKey: "attributedTitle")
    let ok = UIAlertAction(title: "OK", style: .default, handler: nil)

    alert.addAction(ok)
    DispatchQueue.main.async(execute: {
        self.present(alert, animated: true)
    })
}

回答by xc000

Also you can add a UIAlertAction with title " "(space) and add a custom UILabel to UIAlertController.viewat the place of title.

您也可以添加标题为“”（空格）的 UIAlertAction 并在标题位置添加自定义 UILabel UIAlertController.view。