如何快速导航一个页面到另一个页面？

Question

我正在 Swift 中处理从一个视图传递到另一个视图的数据。 我正在使用以下代码：

@IBAction func loginAction(sender: AnyObject) {
let nextViewController = NextViewController(nibName: "NextViewController", bundle: nil) 
self.navigationController?.pushViewController(nextViewController, animated: true) 
}

但是它不会导航第二页，为什么？

Answer 1

如果您没有使用 StoryBoard，则可以使用以下代码： AppDelegate.swift

import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?
    var userInputViewContrller: UserInputViewController = UserInputViewController()
    var navigationViewController: UINavigationController = UINavigationController()


    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {

        self.window = UIWindow.init(frame: UIScreen.mainScreen().bounds)
        self.window?.backgroundColor = UIColor.whiteColor()
        self.navigationViewController = UINavigationController.init(rootViewController: userInputViewContrller)
        self.window?.rootViewController = self.navigationViewController
        self.window?.makeKeyAndVisible()

        return true
    }

现在您已将窗口的 rootViewController 设置为您的 naviagationViewController，该控制器使用页面“userInputViewContrller”的变量进行初始化

import UIKit

class UserInputViewController: UIViewController {

    override func viewWillAppear(animated: Bool) {

        let viewFrame = CGRect(x: 1, y: 30, width: 373, height: 635)
        let view: UIView = UIView(frame: viewFrame)
        self.view.addSubview(view)

        let clickMeButton:UIButton = UIButton()
        let nextButtonFrame = CGRect(x: 200, y: 275, width: 150, height: 30)
        nextButton = UIButton(frame: nextButtonFrame)
        clickMeButton.setTitle("Click here", forState: UIControlState.Normal)
        clickMeButton.addTarget(self, action: "clickMeTapped:", forControlEvents: UIControlEvents.TouchUpInside)
        view.addSubview(clickMeButton)
    }

    func clickMeTapped(sender: UIButton){
        let itemViewController = ItemViewController()
        self.navigationController?.pushViewController(itemViewController, animated: true)
    }
}

单击 UserInputViewController 中的“单击此处”按钮，您将导航到下一个屏幕 itemViewController。

import UIKit

class ItemViewController: UIViewController {
    override func viewWillAppear(animated: Bool) {
        //View

        let viewFrame = CGRect(x: 1, y: 30, width: 373, height: 635)
        let view: UIView = UIView(frame: viewFrame)
        self.view.addSubview(view)

        //Header Label
        let headerLabelFrame = CGRect(x: 25, y: 50, width: 325, height: 30)
        var headerLabel:UILabel = UILabel()
        headerLabel = UILabel(frame: headerLabelFrame)
        headerLabel.text = "Hello I'm in itemViewVireControllr"
        view.addSubview(headerLabel)
  }
}