Question

我正在使用swift 3，我有一个类如下：

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")
}
}

从普通的uiviewcontroller我想在viewDidLoad中调用这样的Assistor函数：

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

Assistor.RegisterTextView(uiview: AnswerTextView)
}
}

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

Answer 1

首先必须将Assistor声明为对象，如果只需要一个可以将其设为单例，则需要将init更改为public，并将registerTextView更改为实例方法

尝试使用此

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

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)
    }
}

希望这有帮助

类func中的UITextViewDelegate

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