如何使用 Swift 从一个视图控制器导航到另一个视图控制器

Question

我想从一个视图控制器导航到另一个。 如何将以下 Objective-C 代码转换为 Swift？

UIViewController *viewController = [[self storyboard] instantiateViewControllerWithIdentifier:@"Identifier"];
UINavigationController *navi = [[UINavigationController alloc] initWithRootViewController:viewController];
[self.navigationController pushViewController:navi animated:YES];

Answer 1

为第二个视图控制器创建一个 swift 文件 (SecondViewController.swift) 并在适当的函数中输入：

let secondViewController = self.storyboard.instantiateViewControllerWithIdentifier("SecondViewController") as SecondViewController
self.navigationController.pushViewController(secondViewController, animated: true)

---

斯威夫特 2+

let mapViewControllerObj = self.storyboard?.instantiateViewControllerWithIdentifier("MapViewControllerIdentifier") as? MapViewController
self.navigationController?.pushViewController(mapViewControllerObj!, animated: true)

---

斯威夫特 4

let vc = UIStoryboard.init(name: "Main", bundle: Bundle.main).instantiateViewController(withIdentifier: "IKDetailVC") as? IKDetailVC
self.navigationController?.pushViewController(vc!, animated: true)

Answer 2

根据我的经验， navigationController为零，所以我将代码更改为：

let next = self.storyboard?.instantiateViewControllerWithIdentifier("DashboardController") as! DashboardController
self.presentViewController(next, animated: true, completion: nil)

不要忘记在StoryBoard -> identity inspector设置 ViewController StoryBoard Id

Answer 3

如果您不希望出现后退按钮（这是我的情况，因为我想在用户登录后显示）这里是如何设置导航控制器的根目录：

let vc = self.storyboard?.instantiateViewControllerWithIdentifier("YourViewController") as! YourViewController
        let navigationController = UINavigationController(rootViewController: vc)
        self.presentViewController(navigationController, animated: true, completion: nil)

Answer 4

斯威夫特 3.01

let secondViewController = self.storyboard?.instantiateViewController(withIdentifier: "Conversation_VC") as! Conversation_VC
self.navigationController?.pushViewController(secondViewController, animated: true)

Answer 5

在 Swift 4.0

var viewController: UIViewController? = storyboard().instantiateViewController(withIdentifier: "Identifier")
var navi = UINavigationController(rootViewController: viewController!)
navigationController?.pushViewController(navi, animated: true)

Answer 6

斯威夫特 3

let secondviewController:UIViewController =  self.storyboard?.instantiateViewController(withIdentifier: "StoryboardIdOfsecondviewController") as? SecondViewController

self.navigationController?.pushViewController(secondviewController, animated: true)

Answer 7

在 Swift 4.1 和 Xcode 10 中

这里AddFileViewController是第二个视图控制器。

故事板 ID 是 AFVC

let next = self.storyboard?.instantiateViewController(withIdentifier: "AFVC") as! AddFileViewController
self.present(next, animated: true, completion: nil)

//OR

//If your VC is DashboardViewController
let dashboard = self.storyboard?.instantiateViewController(withIdentifier: "DBVC") as! DashboardViewController
self.navigationController?.pushViewController(dashboard, animated: true)

如果需要，请使用线程。

前任：

DispatchQueue.main.async { 
    let next = self.storyboard?.instantiateViewController(withIdentifier: "AFVC") as! AddFileViewController
    self.present(next, animated: true, completion: nil) 
}

如果你想在一段时间后搬家。

前任：

//To call or execute function after some time(After 5 sec)
DispatchQueue.main.asyncAfter(deadline: .now() + 5.0) {
    let next = self.storyboard?.instantiateViewController(withIdentifier: "AFVC") as! AddFileViewController
    self.present(next, animated: true, completion: nil) 
} 

Answer 8

在迅捷 3

let nextVC = self.storyboard?.instantiateViewController(withIdentifier: "NextViewController") as! NextViewController        
self.navigationController?.pushViewController(nextVC, animated: true)

Answer 9

let storyBoard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let home = storyBoard.instantiateViewController(withIdentifier: "HOMEVC") as! HOMEVC
navigationController?.pushViewController(home, animated: true);

Answer 10

let objViewController = self.storyboard?.instantiateViewController(withIdentifier: "ViewController") as! ViewController
self.navigationController?.pushViewController(objViewController, animated: true)

Answer 11

斯威夫特 5

使用 Segue 执行从一个视图控制器到另一个视图控制器的导航：

performSegue(withIdentifier: "idView", sender: self)

这适用于 Xcode 10.2。

Answer 12

斯威夫特 4

您可以通过按下导航控制器来切换屏幕首先您必须使用UIViewController设置导航控制器

let vc = self.storyboard?.instantiateViewController(withIdentifier: "YourStoryboardID") as! swiftClassName

self.navigationController?.pushViewController(vc, animated: true)

Answer 13

在 AppDelegate 你可以这样写...

var window: UIWindow?

fileprivate let navigationCtrl = UINavigationController()

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    // Override point for customization after application launch.
    self.createWindow()

    self.showLoginVC()

    return true
}

func createWindow() {
    let screenSize = UIScreen.main.bounds
    self.window = UIWindow(frame: screenSize)
    self.window?.backgroundColor = UIColor.white
    self.window?.makeKeyAndVisible()
    self.window?.rootViewController = navigationCtrl
}

func showLoginVC() {
    let storyboardBundle = Bundle.main
    // let storyboardBundle = Bundle(for: ClassName.self) // if you are not using main application, means may be you are crating a framework or library you can use this statement instead
    let storyboard = UIStoryboard(name: "LoginVC", bundle: storyboardBundle)
    let loginVC = storyboard.instantiateViewController(withIdentifier: "LoginVC") as! LoginVC
    navigationCtrl.pushViewController(loginVC, animated: false)
}

Answer 14

Swift 5.0 更好的实践

更具可重用性和可读性

创建协议

protocol Storyboarded { }

现在创建协议的扩展

extension Storyboarded where Self: UIViewController {
    
    static func instantiateFromMain() -> Self {
        let storyboardIdentifier = String(describing: self)
        // `Main` can be your stroyboard name.
        let storyboard = UIStoryboard(name: "Main", bundle: Bundle.main)
        
        guard let vc = storyboard.instantiateViewController(withIdentifier: storyboardIdentifier) as? Self else {
            fatalError("No storyboard with this identifier ")
        }
        return vc
    }
}

如何使用

  let vc = MyViewController.instantiateFromMain()
  //here you can pass any data to the next view controller. for example we have a variable with name `myString` in our next view contoller and we want to pass the data my `self viewController`
  vc.myString = "This string passed by MyViewController ViewController"
  self.navigationController?.pushViewController(vc, animated: true)

注意：-您需要在故事板上提供与UIViewController类相同的标识符。 检查下面的例子

Answer 15

对于 Swift 4 & 5 用户可以使用这种方式

斯威夫特 5

 let storyBoard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
 let vc = storyBoard.instantiateViewController(withIdentifier: "YourViewController") as! YourViewController
 self.navigationController?.pushViewController(vc, animated: true)

斯威夫特 4

let vc = UIStoryboard.init(name: "Main", bundle: Bundle.main).instantiateViewController(withIdentifier: "YourViewController") as? YourViewController 
self.navigationController?.pushViewController(vc!, animated: true)

Answer 16

Swift 5 更新：

    let next = self.storyboard?.instantiateViewController(withIdentifier: "SecondViewController") as! SecondViewController

    self.present(next, animated: true, completion: nil)

不要忘记更新两个视图控制器的 Storyboard ID！