纯代码编写APP时在AppDelegate.m里面添加NavigationController和TabBarController的代码如下图：
详细代码如下：
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
UIWindow *window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
_window = window;
_window.backgroundColor = [UIColor whiteColor];
_window.hidden = 0;
QYNewsViewController *firstVC = [[QYNewsViewController alloc] init];
UINavigationController *firstNav = [[UINavigationController alloc] initWithRootViewController:firstVC];
QYReaderViewController *secondVC = [[QYReaderViewController alloc] init];
UINavigationController *secondNav = [[UINavigationController alloc] initWithRootViewController:secondVC];
QYVideoViewController *thirdVC = [[QYVideoViewController alloc] init];
UINavigationController *thirdNav = [[UINavigationController alloc] initWithRootViewController:thirdVC];
QYDiscoverViewController *forthVC = [[QYDiscoverViewController alloc] init];
UINavigationController *forthNav = [[UINavigationController alloc] initWithRootViewController:forthVC];
QYMeViewController *fifthVC = [[QYMeViewController alloc] init];
UINavigationController *fifthNav = [[UINavigationController alloc] initWithRootViewController:fifthVC];
NSArray *viewControllers = @[firstNav,secondNav,thirdNav,forthNav,fifthNav];
UITabBarController *mainViewController = [[UITabBarController alloc] init];
mainViewController.viewControllers = viewControllers;
mainViewController.tabBar.tintColor = [UIColor colorWithRed:94/255.0 green:211/255.0 blue:44/255.0 alpha:1.0];
_window.rootViewController = mainViewController;
return YES;
}
