为什么不正确的ViewController显示？以及如何显示正确的？

Question

我试图将用户发送到注册页面，如果他们还没有注册用户名等。我无法获得注册viewController加载，它只加载MainViewController。我已经尝试了我能找到的所有方法，但没有任何效果。我的背景是Java / Android，所以这一切都很新。正确方向的一点将非常感激..

码

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.




    BOOL hasRegistered = YES;

    if (!hasRegistered)
    {
    UIViewController *viewController = [[UIStoryboard storyboardWithName:@"Main" bundle:NULL] instantiateViewControllerWithIdentifier:@"registrationView"];
[self presentViewController:viewController animated:YES completion:nil];
    }

}

Answer 1

试试这个

registrationViewController *viewController = (registrationViewController*)[[UIStoryboard storyboardWithName:@"Main" bundle:NULL] instantiateViewControllerWithIdentifier:@"registrationView"];

代替

UIViewController *viewController = [[UIStoryboard storyboardWithName:@"Main" bundle:NULL] instantiateViewControllerWithIdentifier:@"registrationView"];

如果以模态方式显示视图控制器，则使用此命令打开

[self presentViewController:viewController animated:YES completion:nil];

或者如果你使用navigationController那么

[self.navigationController pushViewController:viewController animated:YES];