Shift to Parent View Controller from child view controller - iOS

Question

I have a main Actions View Controller, and on that there is button "Review". Review Button's functionality is :

 - (IBAction)btnReview:(id)sender
{
    ReviewViewController *vc = [[ReviewViewController alloc]initWithNibName:@"ReviewViewController" bundle:nil];
    [self addChildViewController:vc];
    [vc didMoveToParentViewController:self];
    [self.view addSubview:vc.view];
}

Now on Review Page, I have a button. And on that button's action, I want to switch back to Parent View Controller. Its view should be displayed. I have tried following code, it either pauses or crashes application.

[self didMoveToParentViewController:nil];
[self.view removeFromSuperview];
[self removeFromParentViewController];

I even tried:

[self dismissModalViewControllerAnimated:YES]

I have read other posts related to this question as well but could not find a satisfactory answer. Please Help!

Solution 1

I'm assuming that this is a custom viewcontroller container you're trying to build, "self" is the Main Actions viewController you're talking about.

Try this:

- (IBAction)btnReview:(id)sender
{
    ReviewViewController *vc = [[ReviewViewController alloc]initWithNibName:@"ReviewViewController" bundle:nil];

    [self addChildViewController:vc];

    [self.view addSubview:vc.view];

    [vc didMoveToParentViewController:self];

    vc = nil;

}

For the "Back" button, I'm assuming this is the Button to return to Main Actions viewController from the Review viewController, try this:

- (IBAction)btnReviewHide:(id)sender
 {

    [self willMoveToParentViewController:nil];
    [self.view removeFromSuperview];
    [self removeFromParentViewController];

 }

Hope this helps.

Solution 2

You should use delegation. When you click the button in your ReviewViewController, you call a method like: [self.delegate hideReviewController:self];

And this method would look something like:

- (void)hideReviewController:(ReviewViewController *)controller {
                [UIView animateWithDuration:0.3
                                  delay:0
                                options:UIViewAnimationOptionCurveEaseInOut
                             animations:^{
                                  controller.view.alpha = 0;
                             } completion:^(BOOL finished) {
                                  [self.view removeSubview:controller.view];
                                  // If you want the Review Controller to be deallocated:
                                  [self removeChildViewController:controller];
                             }];
}

EDIT: In your ReviewDelegate.h file add:

@class ReviewViewController;

@protocol ReviewDelegate <NSObject>
- (void)hideReviewController:(ReviewViewController *)controller;
@end

Then add this property:

@property (nonatomic, weak) id <ReviewDelegate> delegate;

In the parent class:

 - (IBAction)btnReview:(id)sender
{
    ReviewViewController *vc = [[ReviewViewController alloc]initWithNibName:@"ReviewViewController" bundle:nil];
    vc.delegate = self;
    [self addChildViewController:vc];
    [vc didMoveToParentViewController:self];
    [self.view addSubview:vc.view];
}

    - (void)hideReviewController:(ReviewViewController *)controller {
                    [UIView animateWithDuration:0.3
                                      delay:0
                                    options:UIViewAnimationOptionCurveEaseInOut
                                 animations:^{
                                      controller.view.alpha = 0;
                                 } completion:^(BOOL finished) {
                                      [self.view removeSubview:controller.view];
                                      // If you want the Review Controller to be deallocated:
                                      [self removeChildViewController:controller];
                                 }];
    }

I also suggest that you read about delegation

Solution 3

Try this

self.view=nil;
[self willMoveToParentViewController:nil];
[self.view removeFromSuperview];
[self removeFromParentViewController];

Solution 4

Since you are adding the Child View as a Subview on to Parent you need to manually it from its superview (in your case parentview). Rather then adding it as a subview you can make use of presentViewController method as follow:

 - (IBAction)btnReview:(id)sender
  {

   ReviewViewController *vc = [[ReviewViewController alloc] initWithNibName:@"ReviewViewController" bundle:nil];
   [self presentViewController:vc
                      animated:YES
                    completion:nil];
  } 

and in the child class code for back button will be :

  -(IBAction)backButtonClicked:(id)sender
  {
      [self dismissViewControllerAnimated:YES completion:nil];
  }

Solution 5

You don't need to make it complex... Just use UINavigationController.

To navigate from ParentVC to ChildVC :

  ChildViewController *ChildVC = [[ChildViewController alloc]initWithNibName:@"ChildViewController" bundle:nil];
[self.navigationController pushViewController:ChildVC animated:YES];

And for navigating back from ChildVC to ParentVC :

ParentViewController *ParentVC = [[ParentViewController alloc]initWithNibName:@"ParentViewController" bundle:nil];

[self.navigationController popViewControllerAnimated:YES];

View more solutions

Comments

[user2334616]

No, I am not using UINavigationController, as my application is Tab based.

[The Kraken]

See Levi's answer above, then.

[user2334616]

Navigating from ParentVC to ChildVC is working fine, but crashes when navigating back from ChildVC to ParentVC.

[Vineet Singh]

Have you implemented 'pushViewController:' for navigation from ParentVC to ChildVC????

[Vineet Singh]

Have you implemented UINavigationControllerDelegate in your interface file of your parentVC as well as in ChildVC.