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Alex Rivera
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in my viewcontroller,I have a button,when press the button,entry the navigationController,my code like: -(IBAction)ShangHaiButtonPressed:(id)sender{ marketviewcontroller = [[MarketViewController alloc]initWithNibName:@"MarketViewController" bundle:nil]; NSLog(@"%@",self.navigationController); [self.navigationController pushViewController:marketviewcontroller animated:YES]; [marketviewcontroller release]; } but I can see the self.navigationController is null,how to solve this problem?thank you. update: - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { _switchviewcontroller = [[SwitchViewController alloc]initWithNibName:@"SwitchViewController" bundle:nil]; [self.window addSubview:_switchviewcontroller.view]; [self.window makeKeyAndVisible]; return YES; }
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