[英]Swift How to change UIAlertController's Title Color
如何使用 Swift 更改 UIAlertController 的标题字体?
我不是在谈论消息颜色,我不是在谈论按钮颜色。
我说的是标题。
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)
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。
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) {
// ...
}
}
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)
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)
}
}
用法
Alert.showAlert(title: "yourTitle", titleColor: .yourcolor, message: "your message", preferredStyle: .alert, titleAction: "your title action", actionStyle: .yourActionStyle, vc: self)
希望这有帮助:)
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)
})
}
您也可以添加标题为“”(空格)的UIAlertController.view
并在标题位置向UIAlertController.view
添加自定义 UILabel 。
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