如何更改文本 - 在UIAlertAction中的左側對齊位置

Question

如何將操作表中UIAlertAction標題的文本對齊方式更改爲swift語言的左側？

下面

是我的代碼：

let alertController = UIAlertController() 
     let alertImage = UIAlertAction(title: "Image", style: .default, handler: nil) 
     let alertVideo = UIAlertAction(title: "Video", style: .default, handler: nil) 

     let alertFile = UIAlertAction(title: "File", style: .default, handler: nil) 
     let alertCancel = UIAlertAction(title: "Cancel", style: .cancel, handler: nil) 

     let paragraphStyle = NSMutableParagraphStyle() 
     // Here is the key thing! 
     paragraphStyle.alignment = .left 

     let messageText = NSMutableAttributedString(
      string: "Video", 
      attributes: [ 
       NSParagraphStyleAttributeName: paragraphStyle, 
       NSFontAttributeName : UIFont.preferredFont(forTextStyle: .subheadline), 
       NSForegroundColorAttributeName : UIColor.black 
      ] 
     ) 

     // add icon to the left alert action 
     let image = UIImage(named: "video") 
     alertVideo.setValue(image, forKey: "image") 
     // align text in the alertAction 
     alertVideo.setValue(UIColor.black, forKey: "titleTextColor") 
     alertVideo.setValue(messageText, forKey: "attributedTitle") 

     alertController.addAction(alertImage) 
     alertController.addAction(alertVideo) 
     alertController.addAction(alertFile) 
     alertController.addAction(alertCancel) 

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

我得到的錯誤信息是

[<UIAlertAction 0x7a6eb760> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key attributedTitle 

我怎樣才能解決這個問題，所以我可以在動作片更改警報措施文本對齊

非常感謝你

Answer 1

我認爲你不能使用defa ult UIAlertController。

但您可以嘗試使用自定義框架，如OKAlertController。

它已經擴展定製

https://github.com/OlehKulykov/OKAlertController