Question

View Controller A displays View Controller B in horizontal orientation

#pragma mark Rotation Delegate Methods
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    // Return YES for supported orientations.
    return YES;
}

-(void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {

    if (UIInterfaceOrientationIsLandscape(toInterfaceOrientation)) {
        [landscapeChartViewController.chartImageView reloadWithUrl:
            [NSString stringWithFormat:@"someurl",[symbol uppercaseString]]];

        NSLog(@"showing chart");
        [self presentModalViewController:landscapeChartViewController animated:NO];
    }    
}

This works fine. View Controller B shows up in landscape orientation. Here is View Controller B’s implementation:

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    // Return YES for supported orientations
    return YES;
}

-(void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {

    if (UIInterfaceOrientationIsPortrait(toInterfaceOrientation)) {
        NSLog(@"dismissing chart");
        [self.parentViewController dismissModalViewControllerAnimated:NO];
    }
}

The problem is, when I go back into portrait orientation to show View Controller A, View Controller A is stuck in landscape orientation. How can I fix this?

Answer 1

EDIT: after reading your comment, I suggest trying to use willRotateToInterfaceOrientation:duration: instead of willAnimateRotationToInterfaceOrientation, like this:

controller A:

 - (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {
   if (UIInterfaceOrientationIsLandscape(toInterfaceOrientation)) {
     [landscapeChartViewController.chartImageView reloadWithUrl:
        [NSString stringWithFormat:@"someurl",[symbol uppercaseString]]];

     NSLog(@"showing chart");
     [self presentModalViewController:landscapeChartViewController animated:NO];
   }    
}

controller B:

 - (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {
  if (UIInterfaceOrientationIsPortrait(toInterfaceOrientation)) {
      NSLog(@"dismissing chart");
      [self.parentViewController dismissModalViewControllerAnimated:NO];
  }
}

I do more or less the same in a project of mine, only between two non modal views.