Question

I have created 3 views.
1st view is home, 2nd is inventory and 3rd is overlay view.
Now from home screen using pushviewcontroller, i am navigating to the inventory view screen.
In inventory view i have one capture button. capture button will open camera on overlayview.
Now the issue is there is a button called back button in the overlayview, when i click on this button i want to navigate to the home screen, but for that i need to 1st dissmiss the camera. How is this possible?

Capture Button in Inventory View

   -(IBAction) btnCapture:(id) sender
   {
     @try 
     {
          [self showImagePicker:UIImagePickerControllerSourceTypeCamera]; 
     }
      @catch (NSException *exception) 
      {
         UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"No Camera" message:@"Camera is not available  " delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil];
         [alert show];
         [alert release];
      }
}

In OverlayView Back button Event:

    -(IBAction)btnBack:(id)sender
     {
          app.navcntr=1;
          [self.delegate didFinishWithCamera];
          [self dismissModalViewControllerAnimated:YES];
      }

and in Inventory View, viewWillAppear

   -(void) viewWillAppear:(BOOL)animated
    {
          if(app.navcntr ==1)
          {
                [self.navigationController popToRootViewControllerAnimated:YES];
          }
           app.navcntr=0;
   }

The issue is it is navigating to home screen but application get crashed.
How to solve it?

Thanks.

Answer 1

I think you are trying to dismiss your camera view twice. I mean didFinishWithCamera method will dismiss it. Remove the line [self dismissModalViewControllerAnimated:YES];

-(IBAction)btnBack:(id)sender
     {
          app.navcntr=1;
          [self.delegate didFinishWithCamera];              
     }

EDITED

You should not perform animations when you are not on screen (“will appear”).

Write your code in viewDidAppear like

-(void) viewDidAppear:(BOOL)animated
    {
          [super viewDidAppear:animated];

          if(app.navcntr ==1)
          {
                [self.navigationController popToRootViewControllerAnimated:YES];
          }
           app.navcntr=0;
   }