Swift：addGestureRecognizer 在 class 中不起作用

Question

我的class:

class SelectBox {
    internal static func openSelector(list:[String: String], parent:UIView){
        print("iosLog HELLO")
        parent.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(handleClick(sender:))))
    }

    @objc func handleClick(sender: UITapGestureRecognizer) {
        print("iosLog CLICK")
    }
}

设置视图：

SelectBox.openSelector(list: AppDelegate.stateList, parent: bgPlaceInto)

启动后打印 HELLO，但点击 view 后出现以下错误：

2018-07-07 18:39:12.298322+0430 Ma[971:260558] [ChatService]: SMT: 2018-07-07 18:39:12.470392+0430 Ma[971:260525] [ChatService]: RCV: 2018-07-07 18:39:12.471851+0430 Ma[971:260591] [ChatService]: RCV: 2018-07-07 18:39:14.674675+0430 Ma[971:260392] *** NSForwarding: warning: object 0x100a9fc70 of class 'Ma.SelectBox' does not implement methodSignatureForSelector: -- trouble ahead Unrecognized selector +[Ma.SelectBox handleClickWithSender:] 2018-07-07 18:39:14.675210+0430 Ma[971:260392] Unrecognized selector +[Ma.SelectBox handleClickWithSender:]

如何设置点击侦听器以通过 class 查看？

谢谢

Answer 1

您的 openSelector 方法是静态的。静态上下文中的单词 self 指的是周围类型的元类型的实例。在这种情况下，SelectorBox.Type.

显然，SelectorBox.Type 没有 handleClick 方法。 SelectorBox 确实如此。

您需要使 openSelector 方法成为非静态方法：

internal func openSelector(list:[String: String], parent:UIView){
    print("iosLog HELLO")
    parent.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(handleClick(sender:))))
}

现在 self 指的是 SelectorBox 实例。

你可以这样称呼它：

// declare this at class level:
let box = SelectorBox()

// call the method like this
box.openSelector()

编辑：您的 class 应该如下所示：

class ViewControllerPage: UIViewController, UITableViewDelegate, UITableViewDataSource { 
    @IBOutlet var bgGenderInto: UIView!
    let box = SelectBox()  
    override func viewDidLoad() { 
        super.viewDidLoad() 
        box.openSelector(list: AppDelegate.genderList, parent: bgGenderInto) 
    }
}

Swift：addGestureRecognizer 在 class 中不起作用

Swift: addGestureRecognizer not work in class

uigesturerecognizer

unrecognized-selector

swift