UILongPressGestureRecognizer如何将当前视图更改为另一个视图控制器？

Question

How do I programmatically change from my 1st view controller to my 2nd view controller, which in storyboard is linked to the 1st in storyboard?

My iPad storyboard has a Tab Bar Controller as the "initial View Controller", which links through a "Relationship Seque view controllers" to a Navigation Controller, which links through a "root view" link, to View Controller A, which has a UIButton, which links through a 'Manual Seque push' to View Controller B.

Tab Bar Cntrl => Navigation Cntrlr ==(root view)==> View Cntrl A, UIButton ==(push)==> View Cntrl B

So, when running, with View Controller A shown, pressing its UIButton causes the view to change to View Controller B.

There's another UIButton on a UITableView cell on View Controller A. When I press and hold this button, the delegate for UILongPressGestureRecognizer fires ok, and I need View Controller B to now be the view.

How then do I change from View Controller A to View Controller B? And with VC B open, how do I change back to VC A ?

THE DELEGATE THAT RESPONDS TO PRESS-AND-HOLD............ - (void)schedule_long_press_delegate:(UILongPressGestureRecognizer *)recognizer { if (recognizer.state == UIGestureRecognizerStateEnded) { printf("Long press Ended ................. \\n");

    // Get storyboard:
    UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:@"MainStoryboard_iPad"
                                                             bundle: nil];
    printf("mainStoryboard = %x \n", (int)mainStoryboard ); // !!! ax

    // Get nav controller for MANAGE view:
    UINavigationController *MANAGE_UINavigationController = (UINavigationController*)[mainStoryboard 
                        instantiateViewControllerWithIdentifier: @"MANAGE_Storyboard_ID"];
    printf("MANAGE_UINavigationController = %x  \n", (int)MANAGE_UINavigationController ); // !!! ax


    // Get MANAGE view's view controller:
    SCHEDULE_UIViewController *schedule_UIViewController = [self.storyboard instantiateViewControllerWithIdentifier:
                                        NSStringFromClass([SCHEDULE_UIViewController class])];
    printf("schedule_UIViewController = %x  \n", (int)schedule_UIViewController ); // !!! ax

    // Change screen to MANAGE view:
    [MANAGE_UINavigationController  pushViewController: schedule_UIViewController animated:YES];
}
else {
    printf("Long press detected .....................   \n");
}        

}

STORYBOARD SETTINGS: UITabBarController ... Storyboard ID is blank. ..links to: UINavigationController ... Class=UINavigationController StoryboardID = "MANAGE_Storyboard_ID" ..links to: UIViewController ... Class=acc StoryboardID is blank (INITIAL VIEW) ..links to: UIViewController ... Class & StoryboardID = "SCHEDULE_UIViewController" (TARGET VIEW)

OUTPUT:..........

mainStoryboard = 1f8b4900
MANAGE_UINavigationController = 1e5d45f0
schedule_UIViewController 2 = 1e5d4b20

Answer 1

In the delegate method for the long press gesture recognizer you can push view controller B from code like this:

ViewControllerB *viewControllerB = [self.storyboard instantiateViewControllerWithIdentifier:NSStringFromClass([ViewControllerB class])];
[self.navigationController pushViewController:viewControllerB animated:YES];

You can use a different identifier if you want; using the class name is just my preference.

Changing back to view controller A will be handled for you by the navigation controller. The user will be presented with a back button in the upper left corner.