当我将它传递给父视图时，无法识别的选择器发送到实例

编程问答 2022-04-22

问题描述

我需要对 navigationItemBar 进行一些更改并添加具有不同对象的按钮。

这是我添加选择器的 viewDidLoad 函数代码

    override func viewDidLoad() {
    super.viewDidLoad()
    
    tapGestureRecgonizer.addTarget(self,action: #selector(showAlertSheet))
    imageView.addGestureRecognizer(tapGestureRecgonizer)
    
    setupAlert()
    
    self.tabBarController?.setLeftNavBarView(selector: #selector(self.returnTogalleryScreenTab))
    self.tabBarController?.setRightNavBarView(selector: #selector(self.routetoAddPhotoForm))
}

这是我的@objc 函数

    @objc func routetoAddPhotoForm() {
    self.presenter?.routetoAddPhotoForm()
}

@objc func returnTogalleryScreenTab() {
    self.tabBarController?.selectedindex = 0
}

以及我在导航栏项目中设置视图的扩展

    func setLeftNavBarView(selector: Selector) {
    let button = UIButton(type: .custom)
    button.setTitle("Cancel",for: .normal)
    button.setTitleColor(UIColor(rgb: 0xFF5F5F5F),for: .normal)
    button.titleLabel?.font = UIFont(name: "Roboto",size: 15)
    button.addTarget(self,action: selector,for: .touchUpInside)
    button.titleEdgeInsets = UIEdgeInsets(top: 0,left: 0,bottom: 0,right: 0)
    let barButton = UIBarButtonItem(customView: button)
    navigationItem.leftBarButtonItem = barButton
}

func setRightNavBarView(selector: Selector) {
    let button = UIButton(type: .custom)
    button.setTitle("Next",for: .normal)
    button.setTitleColor(UIColor(rgb: 0xFFCF497E),for: .normal)
    button.titleLabel?.font = UIFont(name: "Roboto-Bold",right: 0)
    let barButton = UIBarButtonItem(customView: button)
    navigationItem.rightBarButtonItem = barButton
}

但是当我尝试点击 NavigationBarItem 中的按钮时，我收到类似“'-[UITabBarController returnTogalleryScreenTab]: unrecognized selector sent to instance 0x13f00fa00'”之类的错误。我究竟做错了什么。我认为我的问题是我将@objc 函数传递给父视图函数，但我不知道如何以另一种方式做到这一点

解决方法

以下两个功能-

@objc func routeToAddPhotoForm() {
}

@objc func returnToGalleryScreenTab() {
}

应该在您的 UITabBarController 子类中。

原因是 - self 在这里指向您的 UITabBarController 子类 - 而不是您从中调用它的另一个类。

button.addTarget(self,action: selector,for: .touchUpInside)

另一种方式是跟随 -

func setLeftNavBarView(target: Any,selector: Selector) {
    // Use `target` instead of `self` here
    button.addTarget(target,for: .touchUpInside)
}

func setRightNavBarView(target: Any,for: .touchUpInside)
}

来自呼叫站点 -

self.tabBarController?.setLeftNavBarView(target: self,selector: #selector(self.returnToGalleryScreenTab))
self.tabBarController?.setRightNavBarView(target: self,selector: #selector(self.routeToAddPhotoForm))
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