swift - 在以编程方式创建的 UITextView 上捕获 UITapGesture

Question

我正在以编程方式创建 UITextView(的子类)，并希望在用户点击创建的 UITextView 时显示弹出 View 或其他内容。显示弹出 View 不是我的问题，但捕捉点击手势是:

func createCustomText(text:String){
    var tvControl = CustomTextView(frame: CGRectMake(CGFloat(Int.random(50...100)), 
        CGFloat(Int.random(50...100)), 100, 30))
    tvControl.text = text
    baseView.addSubview(tvControl)
    tvControl.font = UIFont(name: "BigruixianthinGB1.0", size: 12)
    tvControl.backgroundColor = UIColor.clearColor()
    activeTextView = tvControl
    var tapRecognizer = UITapGestureRecognizer(target:tvControl, action:"detectTap:")
    tvControl.gestureRecognizers = [tapRecognizer]
}

func detectTap(recognizer: UITapGestureRecognizer) {
    println("tap tap")
}

但它会导致错误:

2015-08-12 10:35:13.665 My App[7030:481148] -[My_App.CustomTextView detectTap:]: unrecognized selector sent to instance 0x7fe8ba813200 2015-08-12 10:35:13.673 My App[7030:481148] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[My_App.CustomTextView detectTap:]: unrecognized selector sent to instance 0x7fe8ba813200'

Answer 1

错误原因是 UITapGestureRecognizer 的 target 设置为 tvControl 即 detectTap: 将在 CustomTextView 的实例上调用。

手势识别器的target应该设置为self:

var tapRecognizer = UITapGestureRecognizer(target:self, action:"detectTap:")