你应该做以下事情
self.window = [[UIWindow alloc]initWithFrame:[[UIScreen mainScreen] bounds]];
NLLoginViewController *loginVC = [[NLLoginViewController alloc]initWithNibName:@"NLLoginViewController" bundle:nil];
PageViewController *pageVC = [[PageViewController alloc]initWithNibName:@"PageViewController" bundle:nil];
UINavigationController *navigation
if(![[NSUserDefaults standardUserDefaults] boolForKey:@"is_SignedIn"]))
navigation = [[UINavigationController alloc]initWithRootViewController:logindVC];
else
navigation = [[UINavigationController alloc]initWithRootViewController:pageVC];
self.window.rootViewController = navigation;
之后在登录视图控制器中,您必须设置
[[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"is_SignedIn"];