记录下在didFinishLaunchingWithOptions中：
self.window=UIWindow(frame:UIScreen.main.bounds)
self.window!.backgroundColor=UIColor.white
//设置root
letrootVC =MainViewController()
self.window!.rootViewController= rootVC
self.window!.makeKeyAndVisible()
记录下在didFinishLaunchingWithOptions中：
self.window=UIWindow(frame:UIScreen.main.bounds)
self.window!.backgroundColor=UIColor.white
//设置root
letrootVC =MainViewController()
self.window!.rootViewController= rootVC
self.window!.makeKeyAndVisible()
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