纯代码设置NavigationController（转载）

在AppDelegate中，要跳转页面，需要初始化当前ViewController的NavigationController

- (BOOL)application:(UIApplication*)application didFinishLaunchingWithOptions:(NSDictionary*)launchOptions

{

// Override point for customization after application launch.

//一下三步，为了去掉storyboard；点击项目，将main interface值置为空

//设置全屏

self.window= [[UIWindowalloc]initWithFrame:[UIScreenmainScreen].bounds];

/**将自己的默认启动ViewController设为根视图**/

//app入口Viewcontroller

ViewController* vc =[[ViewControlleralloc]init];

UINavigationController* nav =[[UINavigationControlleralloc]initWithRootViewController:vc];

self.window.rootViewController= nav;

//显示

[self.windowmakeKeyAndVisible];

returnYES;

}