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在页面跳转时，若想用pushViewController，则必须在AppDelegate设置UINavigationController，否则pushViewController无效。
并且用pushViewController从A跳往B后，在B页面自带“Back”按钮返回上一页。类似于
这样设置，在AppDelegate中
1 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { 2 self.window = [[UIWindow alloc]initWithFrame:[[UIScreen mainScreen] bounds]]; 3 UIViewController *controllerA = [[ViewController alloc]init]; 4 UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:controllerA]; 5 6 self.window.rootViewController = nav; 7 [self.window makeKeyAndVisible]; 8 9 return YES; 10 }
在controllerA中的跳转页面方法中这样写
-(void)turnToOtherController{ ControllerB *controllerB = [[ControllerB alloc]init]; [self.navigationController pushViewController:controllerB animated:YES]; }
这样，导航条就会一直存在。若不想要导航条，那么在AppDelegate这样写
1 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { 2 self.window = [[UIWindow alloc]initWithFrame:[[UIScreen mainScreen] bounds]]; 3 UIViewController *controllerA = [[ViewController alloc]init]; 4 self.window.rootViewController = controllerA; 5 [self.window makeKeyAndVisible]; 6 7 return YES; 8 }
而下面这种方法是通用的，无需设置rootViewController。
[self presentViewController:mainView animated:YES completion:nil];//controller自带的属性
下面的则需要
[self.navigationController pushViewController:mainView animated:YES]; //必须在AppDelegate设置UINavigationController，否则pushViewController无效。 //并且使用pushViewController后，在B页面，会自带一个“Back”按钮返回上一页。
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原文地址：http://www.cnblogs.com/Apologize/p/4309130.html
