在 UITableView 上执行多个状态的 segue

Question

我有一个 UITableView 有两种状态。一种是用户登录时，另一种是用户注销时。两者都显示了不同的细节，每个都填充了大约 4 行。我目前所拥有的不起作用。我该如何修复它，或者我应该用更好的代码替换它。谢谢

        func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
            if Auth.auth().currentUser != nil {
                if  loggedIn.contains("Find Event"){
                    performSegue(withIdentifier: "menutofind", sender: nil)
                }
                else if  loggedIn.contains("Create Event"){
                    performSegue(withIdentifier: "menutocreate", sender: nil)
                }
                else if  loggedIn.contains("Past Events"){
                    performSegue(withIdentifier: "menutopast", sender: nil)
                }
                else if  loggedIn.contains("Recently Viewed"){
                    performSegue(withIdentifier: "menutorv", sender: nil)
                }
                else if  loggedIn.contains("Help"){
                    performSegue(withIdentifier: "menutohelp", sender: nil)
                }
                else if  loggedIn.contains("Setting"){
                    performSegue(withIdentifier: "menutosetting", sender: nil)
                }
            }
            else {

                if  loggedOut.contains("Log In"){
                    performSegue(withIdentifier: "menutologin", sender: nil)
                }
                else if  loggedOut.contains("Find Event"){
                    performSegue(withIdentifier: "menutofind", sender: nil)
                }
                else if  loggedOut.contains("Create Event"){
                    performSegue(withIdentifier: "menutocreate", sender: nil)
                }
                else if  loggedOut.contains("Help"){
                    performSegue(withIdentifier: "menutohelp", sender: nil)
                } 

            }
        }

Answer 1

所以，如果我理解正确，那么您希望根据您点击的单元格触发特定的转场。您当前的代码将不起作用，因为您的第一个 if 语句将始终解析为 true，这可能是您只触发第一个 segue 的原因。

更好的方法是使用当前单元格的indexPath.row 并基于此选择一个segue，这将大大减少您的代码。我还建议创建一个struct，这样您就可以存储更多数据并在整个tableView 中更有效地使用它。

我在下面对您的代码进行了一些更改，看看是否有帮助。

struct UserCell {

    public let title: String
    public let segue: String

    init(title: String, segue: String) {
        self.title = title
        self.segue = segue
    }
}


class SideTableViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {

    @IBOutlet weak var loggout: UIButton!
    @IBOutlet weak var tableview: UITableView!
    @IBOutlet weak var dismissButton: UIButton!

    private let loggedIn: [UserCell] = [
        UserCell(title: "Find Event", segue: "menutofind"),
        UserCell(title: "Create Event", segue: "menutocreate"),
        UserCell(title: "Past Events", segue: "menutopast"),
        UserCell(title: "Recently Viewed", segue: "menutorv"),
        UserCell(title: "Help", segue: "menutohelp"),
        UserCell(title: "Setting", segue: "menutosetting")
    ]

    private let loggedOut: [UserCell] = [
        UserCell(title: "Log In", segue: "menutologin"),
        UserCell(title: "Find Event", segue: "menutofind"),
        UserCell(title: "Create Event", segue: "menutocreate"),
        UserCell(title: "Help", segue: "menutohelp")
    ]

    override func viewDidLoad() {
        super.viewDidLoad()
        dismissButton.layer.cornerRadius =
            dismissButton.frame.size.width / 2
        loggout.layer.cornerRadius =
            loggout.frame.size.width / 2
        if Auth.auth().currentUser != nil {
            loggout.isHidden = false
            print("User Signed In, Showing Relivent Info")

        } else {
            loggout.isHidden = true
            print("User Not Logged In, Showing Relivent Info")
        }
        tableview.reloadData()
    }

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        if Auth.auth().currentUser != nil {
            // User is signed in.
            return loggedIn.count

        } else {
            // No user is signed in.
            return loggedOut.count
        }
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "customcell", for: indexPath as IndexPath)
        if Auth.auth().currentUser != nil {
            // User is signed in.
            cell.textLabel?.text = loggedIn[indexPath.item].title
            return cell

        } else {
            // No user is signed in.
            cell.textLabel?.text = loggedOut[indexPath.item].title
            return cell
        }
    }

    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        if Auth.auth().currentUser != nil {
            performSegue(withIdentifier: self.loggedIn[indexPath.row].segue, sender: nil)
        }
        else {
            performSegue(withIdentifier: self.loggedOut[indexPath.row].segue, sender: nil)
        }
}

UserCell 结构可以轻松扩展以存储更多数据，并在需要时轻松访问。

Answer 2

我解决了同样的问题，在我的例子中，我使用了两个数组来存储选项，所以一个你将存储用户登录时将出现的选项，另一个你将存储用户登录时出现的选项退出。

然后我使用 indexPath.row 来检测选择了哪个位置。不要忘记使用 if 来检测用户是否登录。

Answer 3

这是完整的代码

import UIKit
import Firebase

    class SideTableViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {



        @IBOutlet weak var loggout: UIButton!
        @IBOutlet weak var tableview: UITableView!
        @IBOutlet weak var dismissButton: UIButton!

        var loggedIn = ["Find Event", "Create Event", "Past Events", "Recently Viewed", "Help", "Setting"]

        var loggedOut = ["Log In", "Find Event", "Create Event", "Help"]


        override func viewDidLoad() {
            super.viewDidLoad()
            dismissButton.layer.cornerRadius =
            dismissButton.frame.size.width / 2
            loggout.layer.cornerRadius =
            loggout.frame.size.width / 2
            if Auth.auth().currentUser != nil {
                loggout.isHidden = false
                print("User Signed In, Showing Relivent Info")

            } else {
                loggout.isHidden = true
                print("User Not Logged In, Showing Relivent Info")
            }
            tableview.reloadData()
        }

        func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
            if Auth.auth().currentUser != nil {
                // User is signed in.
                return loggedIn.count

            } else {
                // No user is signed in.
                return loggedOut.count
            }
        }

        func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
            let cell = tableView.dequeueReusableCell(withIdentifier: "customcell", for: indexPath as IndexPath)
            if Auth.auth().currentUser != nil {
                // User is signed in.
                cell.textLabel?.text = loggedIn[indexPath.item]
                return cell

            } else {
                // No user is signed in.
                cell.textLabel?.text = loggedOut[indexPath.item]
                return cell
            }
        }

        func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
            if Auth.auth().currentUser != nil {
                if  loggedIn.contains("Find Event"){
                    performSegue(withIdentifier: "menutofind", sender: nil)
                }
                else if  loggedIn.contains("Create Event"){
                    performSegue(withIdentifier: "menutocreate", sender: nil)
                }
                else if  loggedIn.contains("Past Events"){
                    performSegue(withIdentifier: "menutopast", sender: nil)
                }
                else if  loggedIn.contains("Recently Viewed"){
                    performSegue(withIdentifier: "menutorv", sender: nil)
                }
                else if  loggedIn.contains("Help"){
                    performSegue(withIdentifier: "menutohelp", sender: nil)
                }
                else if  loggedIn.contains("Setting"){
                    performSegue(withIdentifier: "menutosetting", sender: nil)
                }
            }
            else {

                if  loggedOut.contains("Log In"){
                    performSegue(withIdentifier: "menutologin", sender: nil)
                }
                else if  loggedOut.contains("Find Event"){
                    performSegue(withIdentifier: "menutofind", sender: nil)
                }
                else if  loggedOut.contains("Create Event"){
                    performSegue(withIdentifier: "menutocreate", sender: nil)
                }
                else if  loggedOut.contains("Help"){
                    performSegue(withIdentifier: "menutohelp", sender: nil)
                } 

            }
        }