AppDelegate初始化快捷引用

[[UINavigationBar appearance] setBarTintColor:[UIColor colorWithRed:0.973 green:0.965 blue:0.965 alpha:1.000]];

    

self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

    

self.window.backgroundColor = [UIColor whiteColor];

    

ViewController *viewController = [[ViewController alloc] init];

    

UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:viewController];

    

self.window.rootViewController = navigationController ;

    

[self.window makeKeyAndVisible];