can't remove navigation item in QLPreviewController in iOS 6 - ios

Question

i subclassed QLPreviewController and used
[[self navigationItem] setRightBarButtonItem:nil];
but the navigationItem is only removed in iOS 5, not iOS6

Answer 1

i managed to do it by creating a timer to check for the navigation item and remove it
Here is the code:
[self inspectSubviewsForView:self.view];
- (void)inspectSubviewsForView:(UIView *)view
{
for (UIView *subview in view.subviews)
{
NSLog(#"class detected %#",[subview description]);
if ([subview isKindOfClass:[UINavigationBar class]])
{
UINavigationBar *bar = (UINavigationBar *)subview;
if ([[bar items] count] > 0)
{
UINavigationItem *navItem = [[bar items] objectAtIndex:0];
[navItem setRightBarButtonItem:nil];
{
}
if ([subview isKindOfClass:[UIView class]] && [[subview subviews] count] > 0)
{
[self inspectSubviewsForView:subview];
}
}
}
[self inspectSubviewsForView:subview];
}
}

Answer 2

Simple solution for this is add one dummy view to current viewController and Add QLPreviewController.view to dummy view .
previewController = [[QLPreviewController alloc] init];
previewController.dataSource = self;
previewController.delegate = self;
previewController.currentPreviewItemIndex = 0;
[self.ContentView addSubview:previewController.view];
- (IBAction)removeQPView:(id)sender {
[previewController.view removeFromSuperview];
}