ios - 在 UIViewController 上执行的 UIView 上动态创建 UIButton AddTarget

Question

目前这段代码执行标签样式列表，当我想尝试将 addTarget 操作 optionClicked 传递给我的 UIViewController

时，问题仍然存在

DrawerView.swift

let menuOptions = ["Info", "Actions", "Users", "Patiens"]

        menuOptions.forEach({

            let button = UIButton()
            button.setTitle($0, for: .normal)

            if $0.contains(menuOptions[0]) {
                button.style(with: .filled)
            } else {
                button.style(with: .outlined)
                button.addTarget(self, action: #selector(optionClicked(_:)), for: .touchUpInside)
            }
            actionStackView.addArrangedSubview(button)
        })

DrawerController.swift

class DrawerController: UIViewController {

    var shareView = DrawerView()
    var viewModel: CarDetailViewModel?

    override func loadView() {
        shareView.viewModel = viewModel
        view = shareView
    }

    @objc func optionClicked(_ sender: UIButton) {

        let feedbackGenerator = UISelectionFeedbackGenerator()
        feedbackGenerator.selectionChanged()

        let optionClicked: String = sender.titleLabel?.text ?? "0"

        switch optionClicked {
        case "Actions": present(DrawerActionController(), animated: true, completion: nil)
        case "Notifications":
            let viewController = DrawerNotificationController()
            viewController.carDetailViewModel = viewModel
           present(viewController, animated: true, completion: nil)

        case "Patients":
            let viewUserController = DrawerUserController()
            viewUserController.carPath = "9000"
           present(viewUserController, animated: true, completion: nil)
        default: break
        }
    }
}

尝试了 button.addTarget(self, action: #selector(optionClicked(_:)), for: .touchUpInside) 但没有成功。

Answer 1

在方法 button.addTarget(self, action: #selector(optionClicked(_:)), for: .touchUpInside) 中，您需要提供指向将接收操作的 viewController 的指针。

在您的情况下，最简单的方法是在初始化时使用 DrawerController 创建惰性变量 DrawerView，并在按钮操作中使用抽屉 Controller 。

抽屉 View .swift

class DrawerView: UIView {

    private unowned let drawerController: DrawerController

    init(drawerController: DrawerController) {
        self.drawerController = drawerController
    }

    ... wherever is your code placed ...

    let menuOptions = ["Info", "Actions", "Users", "Patiens"]

    menuOptions.forEach({

        let button = UIButton()
        button.setTitle($0, for: .normal)

        if $0.contains(menuOptions[0]) {
            button.style(with: .filled)
        } else {
            button.style(with: .outlined)
            button.addTarget(drawerController, action: #selector(DrawerController.optionClicked(_:)), for: .touchUpInside)
            actionStackView.addArrangedSubview(button)
        }
    })

    ....
}

使用unowned 或weak 来防止保留循环和内存泄漏很重要

要创建 DrawerView，您可以使用惰性变量:

lazy var shareView: DrawerView = DrawerView(drawerController: self)

lazy 将允许您使用 self，您也可以使用 optional 并稍后创建变量，但这基本上就是 lazy 所做的。

希望对您有所帮助!