如何在iOS中从rootViewController推送Viewcontroller

Question

I have 2 ViewController. loginViewControl which sets to rootViewControoler :

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

    loginViewControl = [[LoginTab alloc] init];
    self.window.rootViewController = loginViewControl;
    [self.window makeKeyAndVisible];

    return YES;
}

And I create StatusViewController : *.h

 @interface StatusViewController : UIViewController<UITabBarControllerDelegate>
{
    IBOutlet UITabBarController *tabBarController;

    IBOutlet UIButton *UploadButton;
    IBOutlet UIButton *ConvertorButton;
    IBOutlet UIButton *CompletedButton;
}
@property (nonatomic, retain) IBOutlet UITabBarController *tabBarController;
@end

Now I want to push StatusViewController from loginViewControl(rootviewcontroller).I used below code but it not work.

 - (IBAction)statusButtonClick:(id)sender;
{
    StatusViewController *statusView = [[StatusViewController alloc]init];
    [self.navigationController pushViewController:statusView animated:YES];

    [statusView release];   

}

Do you have any suggestions? Thanks in advance

Answer 1

You not setting UINavigationViewcontroller at the didFinishLaunchingWithOptions of Window's RootViewcontroller, We can't Push a UIViewController without UINavigationViewcontroller

So First Set LoginViewController as a RootViewController of UINavigationViewcontroller like Bellow:-

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

    loginViewControl = [[YourLoinViewcontroller alloc] initWithNibName:@"YourLoinViewcontroller" bundle:nil];
    UINavigationController *objNavigationController=[[UINavigationController alloc]initWithRootViewController:loginViewControl];

    self.window.rootViewController = objNavigationController;
    [self.window makeKeyAndVisible];

    return YES;
}

EDIT

Connect your StatusViewcontroller's view with File owner like bellow:-

your push method like this:-

- (IBAction)statusButtonClick:(id)sender;
{
    StatusViewController *statusView = [[StatusViewController alloc]initWithNibName:@"StatusViewController" bundle:nil];
    [self.navigationController pushViewController:statusView animated:YES];

}

Answer 2

Unless your login view controller is a navigation controller, self.navigationController in statusButtonClick will return nil and so this won't work. Maybe you can try:

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

    loginViewControl = [[LoginTab alloc] init];
    self.window.rootViewController = [[UINavigationController alloc] initWithRootViewController:loginViewControl];
    [self.window makeKeyAndVisible];

    return YES;
}

This will enclose a loginViewController in a navigationController which will permit you to push another viewController in the navigationController's stack.

Answer 3

- (IBAction)statusButtonClick:(id)sender; {

    // If used StoryBoard
    UIStoryboard *story=[UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
    StatusViewController *statusView = [story instantiateViewControllerWithIdentifier:@"StatusViewController"];
    [self.navigationController pushViewController:statusView animated:YES];

    // If used XIB
     StatusViewController *statusView = [[StatusViewController alloc]initWithNibName:@"StatusViewController" bundle:nil];
    [self.navigationController pushViewController:statusView animated:YES]; }