UITextViewDelegate

Question

我使用SWIFT 3，我有一个类，如下所示：

class Assistor : NSObject , UITextViewDelegate { 


private override init() { 

} 

class func RegisterTextView(uiview:UIView) { 

    if let RegisteredView = uiview as? UITextView { 
     RegisteredView.delegate = self as! UITextViewDelegate 
    } 
} 


func textViewDidBeginEditing(_ textView: UITextView) { 
    print("Begin") 
} 

func textViewDidEndEditing(_ textView: UITextView) { 
    print("End") 
} 
} 

从一个正常的UIViewController我要调用的辅助器功能像这样在viewDidLoad中：

class InqueryDetailsViewController: UIViewController { 
    @IBOutlet weak var AnswerTextView:UITextView! 
override func viewDidLoad() { 
    super.viewDidLoad() 

Assistor.RegisterTextView(uiview: AnswerTextView) 
} 
} 

很明显，我想从助理触发textViewDidBeginEditing，而不是从uiviewcontroller中触发。怎么做？

Answer 1

首先你Assistor必须声明为对象，如果你只想要一个你可以把它作为单，您需要在init变更为公开，并改变registerTextView作为实例方法

尝试用这种

class Assistor : NSObject , UITextViewDelegate { 

    //Singleton 
    static let sharedInstance: Assistor = Assistor() 

    override init() { 
     super.init() 
    } 

    func registerTextView(uiview:UIView) { 
     if let RegisteredView = uiview as? UITextView { 
      RegisteredView.delegate = self as! UITextViewDelegate 
     } 
    } 


    func textViewDidBeginEditing(_ textView: UITextView) { 
     print("Begin") 
    } 

    func textViewDidEndEditing(_ textView: UITextView) { 
     print("End") 
    } 
} 

使用它

class ViewController: UIViewController { 

    @IBOutlet weak var textView: UITextView! 

    var assistor : Assistor = Assistor() 

    override func viewDidLoad() { 
     super.viewDidLoad() 

     self.assistor.registerTextView(uiview: self.textView) 
     //using as singleton 
     //Assistor.sharedInstance.registerTextView(uiview: self.textView) 
    } 
} 

希望这有助于