错误：-视图控制器功能迅速的Xib UIButton目标

Question

我在设置按钮目标时出现错误unrecognized selector sent to instance。我在Xib文件中定义了按钮（有点警报），当按下此按钮时它将定位到ViewController函数。如何在xib按钮上调用函数？

Xib代码

@IBDesignable class DeleteAlert: UIView {


    @IBOutlet weak var myBtn: UIButton!
    let VC = ViewController()

    override func awakeFromNib() {
        super.awakeFromNib()
        layoutIfNeeded()
        myBtn.addTarget(self, action: #selector(VC.deleteImage(_:)), for: .touchUpInside)


    }

    @IBAction func didCancel(_ sender: Any) {
        removeFromSuperview()
    }

    @IBAction func didDelete(_ sender: Any) {


    }
}

ViewController函数

@objc func deleteImage(_ sender: AnyObject){

        let row = sender.view.tag
        self.data?.remove(at: row)
        self.images?.remove(at: row)
        self.collectionView.reloadData()
    }

Answer 1

在这里，您需要使用自定义委托来访问按钮操作。试试这个

protocol handleDeleteAction {
    func didDeleteButtonClicked(UIButton)
    }

@IBDesignable class DeleteAlert: UIView {

@IBOutlet weak var myBtn: UIButton!
   // Now create a variable in DeleteAlert view
    var delegate: handleDeleteAction?


override func awakeFromNib() {
    super.awakeFromNib()
    layoutIfNeeded()
    myBtn.addTarget(self, action: #selector(didDelete(_:)), for: .touchUpInside)        

}

@IBAction func didCancel(_ sender: Any) {
    removeFromSuperview()
}

@IBAction func didDelete(_ sender: Any) {
    self.delegate?.didDeleteButtonClicked(sender:sender)        
}
}

在您的viewcontroller viewdidload中调用委托

let deleteAlertView : DeleteAlert !
deleteAlertView.delegate = self

并像这样处理动作，然后您的viewController确认为协议

    extension ViewController : handleDeleteAction {
    func didDeleteButtonClicked(sender:UIButton) {
       let row = sender.view.tag
    self.data?.remove(at: row)
    self.images?.remove(at: row)
    self.collectionView.reloadData()

}
    }