import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?


    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
        // 启动后的第一个页面
        self.window = UIWindow(frame: UIScreen.mainScreen().bounds);
        
        // 这里设置rootViewController为ViewController实例
        let vc = ViewController();
        self.window?.rootViewController = vc;//本行vc处填写你要选择的页面
        
        self.window?.backgroundColor = .whiteColor();
        self.window?.makeKeyAndVisible();
        return true;
    }

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        self.view.backgroundColor = .yellowColor();//背景色的设置
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


}