不使用Main.storyboard的方法

1. 保留Main.storyboard
2. 删除Main.storyboard中的controller
3. Info.plist中删除Main Storyboard Base Name对应关系

didFinishLoadD代理中要实例化UIWindow
window = UIWindow(frame: UIScreen.mainScreen().bounds)
window?.rootViewController = sandwichesController
window?.makeKeyAndVisible()

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