如何使用 Swift 从一个视图控制器导航到另一个视图控制器答案

【问题标题】：How to Navigate from one View Controller to another using Swift如何使用 Swift 从一个视图控制器导航到另一个视图控制器
【发布时间】：2014-07-25 03:35:04
【问题描述】：

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];

【问题讨论】：

检查这个：stackoverflow.com/a/38244058/1753005

标签： ios swift uinavigationcontroller uikit viewcontroller

【解决方案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)

【讨论】：

@audrey，嗨，如何设置 navigationController？
@Sanjivani，您好，您的视图控制器可以使用 Storyboard 创建并将您的 firstViewController 指定为 rootViewController。您的导航控制器 (swift) 类将如下所示：import UIKitclass SwiftNavigationController: UINavigationController { init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: NSBundle?) { super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil) // Custom initialization }`` override func viewDidLoad() { super.viewDidLoad() }
我也有同样的问题，我被困在如何从一个 ViewController 导航到另一个。当我尝试此代码时，我收到此错误：unexpectedly found nil while unwrapping an Optional value 在代码的第二行。请帮忙
我遇到了有关动画的问题：参数如下：“无法转换表达式的类型 '$T7??'输入“BooleanLiteralConvertible””。
您需要确保控制器嵌入到 NavigationController 中才能正常工作，否则会出错。

【解决方案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)

别忘了在 StoryBoard 中设置 ViewController StoryBoard Id -> identity inspector

【讨论】：

这是因为您的视图控制器没有在导航视图控制器中消退。

【解决方案3】：

如果您不希望后退按钮出现（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：

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

【讨论】：

【解决方案4】：

SWIFT 3.01

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

【讨论】：

【解决方案5】：

斯威夫特 3

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

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

【讨论】：

【解决方案6】：

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

【讨论】：

能否请您简要解释一下您的代码的作用、它解决问题的原因以及它与所有其他答案的不同之处。
这里我使用 storyboard id 作为标识符。通过引用（objViewController）将控件推送到 View Controller 类

【解决方案7】：

在 Swift 3 中

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

【讨论】：

【解决方案8】：

在 Swift 4.0 中

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

【讨论】：

【解决方案9】：

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。

例如：

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

如果您想一段时间后移动。

前：

//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) 
}

【讨论】：

【解决方案10】：

斯威夫特 4

你可以通过推导航控制器来切换屏幕首先你必须用UIViewController设置导航控制器

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

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

【讨论】：

【解决方案11】：

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

【讨论】：

我认为这不是 Swift 或 Objc 语法

【解决方案12】：

斯威夫特 5

使用 Segue 执行从一个 View Controller 到另一个 View Controller 的导航：

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

这适用于 Xcode 10.2。

【讨论】：

转场类型？

【解决方案13】：

在 AppDelegate 中你可以这样写...

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)
}

【讨论】：

【解决方案14】：

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！

【讨论】：

你知道，Swift 的版本是 5.4。

【解决方案15】：

更好的实践 Swift 5.0

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：-您需要在情节提要上提供与 UIViewController 类相同的标识符。检查下面的示例

【讨论】：

【解决方案16】：

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)

【讨论】：