类函数中的UITextViewDelegate

Question

我使用的是斯威夫特3，我有一个课程如下：

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")
}
}

在普通的uiview控制器中，我想在viewDidLoad中调用像这样的助手函数：

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

Assistor.RegisterTextView(uiview: AnswerTextView)
}
}

显然，我希望从助手而不是从trigger控制器触发textViewDidBeginEditing。怎么做？

Answer 1

首先，必须将您的Assistor声明为对象，如果只需要一个对象，则需要将init更改为public，并将registerTextView更改为实例方法。

尝试使用这个

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it

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)
    }
}

希望这能有所帮助