Question

我试图将此SuperTViewController.swift用作基本视图控制器并为后退按钮设置委托。 ProjectTableViewController.swift是应用委托的viewcontrollers之一。由于扩展类，ProjectTableViewController.swift确实有按钮。但是我希望自定义back（）用于每个不同页面的不同操作。谈到执行，print（“project”）无法运行。请告诉我实施代表的详细信息并申请？以下是我的代码。

SuperTViewController.swift

protocol backProtocol : UINavigationBarDelegate {
      func back ()
}


class SuperTViewController: UITableViewController {
    weak var delegate: backProtocol?

    override func viewDidLoad() {
        super.viewDidLoad()


        navigationItem.rightBarButtonItem = UIBarButtonItem(image: UIImage(named: "btn_add")?.withRenderingMode(.alwaysOriginal), style: .plain, target: self, action: #selector(ButtonTapped))


        // Uncomment the following line to preserve selection between presentations
        // self.clearsSelectionOnViewWillAppear = false

        // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
        // self.navigationItem.rightBarButtonItem = self.editButtonItem()
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    // MARK: - Table view data source

    override func numberOfSections(in tableView: UITableView) -> Int {
        // #warning Incomplete implementation, return the number of sections
        return 0
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        // #warning Incomplete implementation, return the number of rows
        return 0
    }

    func ButtonTapped() {
        print("Button Tapped")
        delegate?.back()

    }

}

ProjectTableViewController.swift

import UIKit

class ProjectTableViewController: SuperTViewController {


    override func viewDidLoad() {
        super.viewDidLoad()

        delegate?.back()

    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
            }

    // MARK: - Table view data source

    override func numberOfSections(in tableView: UITableView) -> Int {
        // #warning Incomplete implementation, return the number of sections
        return 0
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        // #warning Incomplete implementation, return the number of rows
        return 0
    }

    func back () {
        print("project")
    }


}

Answer 1

首先，扩展（实现）协议。然后，将委托分配给自己

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SWIFT 3.0代表导航栏按钮

1 个答案: