单击tableview单元格行时如何推送新的viewcontroller？

Question

我是SWIFT编程中的新人（3天更新）。 我在swift中创建了一个示例tableview单元演示。 我在xib中使用了“Testviewcontroller”。

代码是

import UIKit


class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {

    @IBOutlet weak var myTableview:UITableView!

    let fruits = ["Apple","Banana","Grapes","Chiku","Watermalon","Bear"]
    let blogSegueIdentifier = "TestViewController"

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.


    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    public func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int
    {
        return self.fruits.count
    }
    public func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
    {
        let cell: UITableViewCell = UITableViewCell(style: UITableViewCellStyle.subtitle, reuseIdentifier: "MyTestCell")
        cell.textLabel?.text = self.fruits[indexPath.row]
        return cell
    }

    public func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath)
    {

        let testVC = TestViewController(nibName : "TestViewController" , bundle:nil)
        navigationController?.pushViewController(testVC, animated: true)

        print("You have selected \(indexPath.row) row")
    }

}

的appDelegate

import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?


    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        return true
    }

    func applicationWillResignActive(_ application: UIApplication) {
        // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
        // Use this method to pause ongoing tasks, disable timers, and invalidate graphics rendering callbacks. Games should use this method to pause the game.
    }

    func applicationDidEnterBackground(_ application: UIApplication) {
        // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
        // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
    }

    func applicationWillEnterForeground(_ application: UIApplication) {
        // Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background.
    }

    func applicationDidBecomeActive(_ application: UIApplication) {
        // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
    }

    func applicationWillTerminate(_ application: UIApplication) {
        // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
    }


}

我的问题是

我使用了“didSelectRowAt indexPath”委托方法。 我无法推送新的视图控制器 请帮助我们，我无法解决这个问题。

Answer 1

当您为每个UIViewController使用XIB时，您需要在AppDelegate.swift文件中添加以下代码，然后才能访问navigationController中的ViewController.swift。

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

        let viewController = ViewController(nibName:"ViewController", bundle:nil)

        let navController = UINavigationController(rootViewController: viewController)

        self.window!.rootViewController = navController

        self.window!.makeKeyAndVisible()
        return true

}

Answer 2

我认为你没有一个navigationController。如果这个viewController是你的rootViewController，你可以在你的appDelegate中做这样的事情。

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

let navController = UINavigationController()
let yourViewContoller = YourViewController()

navController.viewControllers = [yourViewContoller]

self.window?.rootViewController = navController
return true

}

确保你的viewController中已经写了这样的

    init() {
    super.init(nibName: "YourViewController", bundle: Bundle.main)
}

Answer 3

我认为导航控制器在你的情况下是零。单击您的xib文件。单击主视图。转到Editor菜单，点击Embed in，然后选择Navigation controller。