Swift:为 UIView 类添加手势识别器

Question

我使用这段代码:

class StarClass: UIView {
    @IBOutlet weak var bgStar: UIView!

    class func createMyClassView() -> StarClass {
        let myClassNib = UINib(nibName: "Star", bundle: nil)

        let nW = myClassNib.instantiate(withOwner: nil, options: nil)[0] as! StarClass
        nW.bgStar.layer.cornerRadius = 15

        nW.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(handleStar(sender:))))

        return nW
    }

    @objc func handleStar(sender: UITapGestureRecognizer) {
        print("iosLog STAR")
    }
}

运行后，如果我点击 View ，会出现以下错误:

2018-07-10 11:11:50.496349+0430 Ma[23098:89853] +[Ma.StarClass handleStarWithSender:]: unrecognized selector sent to class 0x10ef5cac0 2018-07-10 11:11:50.513392+0430 Ma[23098:89853] * Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '+[Ma.StarClass handleStarWithSender:]: unrecognized selector sent to class 0x10ef5cac0' * First throw call stack:...

Answer 1

线路似乎有问题:

nW.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(handleStar(sender:))))

这里，在 class 函数中，self 指的是 Class 类型，而不是它的对象。但是您要在对象上添加手势识别器。这里的解决方案是这样做:

nW.addGestureRecognizer(UITapGestureRecognizer(target: nW, action: #selector(handleStar(sender:))))