如何在Swift中以编程方式使用导航和加载视图？

Question

我正在学习Swift，并尝试编写一个小应用程序。

我正在尝试使用导航将视图推送到webview。但是现在它根本不动，这是我的代码：

在表格视图中，我点击每个单元格将让我转到其他视图：

类ViewController：UIViewController，UITableViewDelegate，UITableViewDataSource {     @IBOutlet var myTable：UITableView！     var items：[String] = [＆＃34; Date Picker＆＃34;，＆＃34; Data of Data＆＃34;，＆＃34; Slider＆＃34;，＆＃34; Show Image＆＃34;，＆＃ 34; Web显示＆＃34;];

override func viewDidLoad() {
    super.viewDidLoad()

    NSLog("Hello World at console");
    var nib = UINib(nibName: "ListCell", bundle: nil)
    myTable?.registerNib(nib, forCellReuseIdentifier: "ListCell")
    // Do any additional setup after loading the view, typically from a nib.
}

 func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {

    switch indexPath.row
    {
    case 0:
        var goView = DatePickerViewController(nibName: "DatePickerViewController", bundle:nil)
        self.navigationController?.pushViewController(goView, animated: false)
        println(items[indexPath.row])
        break
    case 1:
        var goView = DetailViewController(nibName: "DetailViewController", bundle:nil)
        self.navigationController?.pushViewController(goView, animated: false)
        println(items[indexPath.row])
        break
    case 2:
        var goView = SliderViewController(nibName: "SliderViewController", bundle:nil)
        self.navigationController?.pushViewController(goView, animated: false)
        println(items[indexPath.row])
        break
    case 3:
        var goView = ImageCalleryViewController(nibName: "ImageCalleryViewController", bundle:nil)
        self.navigationController?.pushViewController(goView, animated: false)
        println(items[indexPath.row])
        break
    case 4:
        // var goView = WebDisplayViewController(nibName: "WebDisplayViewController", bundle:nil)
        // self.navigationController?.pushViewController(goView, animated: false)
        self.navigationController?.pushViewController(WebDisplayViewController(), animated: false);
        println(WebDisplayViewController());
        println(items[indexPath.row])
        break
    default:
        return;

    }
}

这是我在网络视图中的代码。我试图不使用Interface Builder（想要先习惯语法）

import Foundation
import UIKit


class WebDisplayViewController: UIViewController {

    override func viewDidLoad() {

        var webView = UIWebView (frame: CGRectMake(20, 240, 280, 310));
        var url = NSURL(string :"http://developer.xamarin.com/guides/cross-platform/Application_Fundamentals/Web_Services/");
        var request = NSURLRequest(URL: url!);
        webView.scalesPageToFit = true;
        webView.loadRequest(request);
        self.view.addSubview(webView);
        println("I am in Web");
        super.viewDidLoad()
    }

}

AppDelegate中的代码：

class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?


    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
        // Override point for customization after application launch.

        let mainVC = ViewController()
        let navigationVC = UINavigationController(rootViewController: mainVC)
        window?.rootViewController = navigationVC;
        window?.makeKeyAndVisible()
        return true
    }

请告诉我有什么问题。