ios - UIBarButtonItem 导致无法识别的选择器发送到实例

Question

我想以编程方式在 UIBarButtonItem 上创建弹出菜单，这是我编写的代码

    static func setNavigationRightButton(myView: UIViewController) {

    navBarBtn = UIButton(type: .custom)
    navBarBtn.addTarget(myView, action: #selector(pizza.handleFunc(_:)), for: .touchUpInside)
    navBarBtn.frame = CGRect(x: 0, y: 0, width: 33, height: 30)
    navBarBtn.imageView?.contentMode = .scaleAspectFit
    //navBarBtn.setTitle("10", for: .normal)
    setCartBadge()
    navBarBtn.titleLabel?.font = UIFont.systemFont(ofSize: 9)

    let barButton = UIBarButtonItem(customView: navBarBtn)
    myView.navigationItem.rightBarButtonItem = barButton
}

这是 Action 函数

    func handleFunc(_ sender: UIBarButtonItem!) {
    let vc = storyboard?.instantiateViewController(withIdentifier: "ShoppingCartPopoverVC") as! ShoppingCartPopoverVC
    vc.preferredContentSize = CGSize(width: UIScreen.main.bounds.width, height: 100)
    let navController = UINavigationController(rootViewController: vc)
    navController.modalPresentationStyle = .popover
    let popOver = navController.popoverPresentationController
    popOver?.delegate = self
    popOver?.barButtonItem = sender
    self.present(navController, animated: true, completion: nil)
}

当我在这里“popOver?.barButtonItem = sender”时，应用程序崩溃并出现此错误

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIButton _viewForPresenting]: unrecognized selector sent to instance 0x7faa0b5148f0'

Answer 1

您的目标/操作被设置为 UIButton，但是您的操作方法为发送者指定了 UIBarButtonItem 而不是 UIButton。

您需要更新您的操作:

func handleFunc(_ sender: UIButton) {
    let vc = storyboard?.instantiateViewController(withIdentifier: "ShoppingCartPopoverVC") as! ShoppingCartPopoverVC
    vc.preferredContentSize = CGSize(width: UIScreen.main.bounds.width, height: 100)
    let navController = UINavigationController(rootViewController: vc)
    navController.modalPresentationStyle = .popover
    let popOver = navController.popoverPresentationController
    popOver?.delegate = self
    popOver?.sourceView = sender
    popOver?.sourceRect = sender.bounds
    self.present(navController, animated: true, completion: nil)
}

请注意参数的更改以及在弹出框 Controller 上设置的属性。