UIModalPresentationFormSheet White Corners [duplicate]

This question already has answers here: iOS: Why do I have white, rounded corners on my modal view? (9 answers) Closed 9 years ago.

I'm attempting to use UIModalPresentationFormSheet with a dark background but the corners of the开发者_Go百科 view always have a little white showing.

You can see a picture here.

I haven't seen this happen before. Any ideas on what is causing this?

---

First import "QuartzCore/QuartzCore.h" in which ViewController will show as UIModalPresentationFormSheet then override the viewWillAppear

- (void)viewWillAppear:(BOOL)animated 
{
    [super viewWillAppear:animated];
    self.view.superview.layer.cornerRadius = 10;
    self.view.superview.layer.borderColor = [UIColor darkGrayColor].CGColor;
    self.view.superview.layer.borderWidth = 1;
    self.view.superview.clipsToBounds = YES;
}

---

If you want the shadow you shouldn't clip to the superview's bounds.

This solution will keep the shadow visible.

self.view.superview.layer.cornerRadius = 7.f;
for (CALayer *layer in self.view.superview.layer.sublayers)
    if (layer != self.view.layer)
        layer.cornerRadius = 8.f;

---

    SpecPopover *ctrl = [[SpecPopover alloc] initWithNibName:@"SpecPopover" bundle:nil];

     // Create a Navigation controller
     UINavigationController *navController = [[UINavigationController alloc]
                                                         initWithRootViewController:ctrl];

     [self.navigationController pushViewController:ctrl animated:YES];
     navController.modalPresentationStyle = UIModalPresentationFormSheet;
     navController.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
     navController.view.backgroundColor = [UIColor clearColor];        

     // show the navigation controller modally
     [self presentModalViewController:navController animated:YES];
      navController.view.superview.frame = CGRectMake (200,200,400,400);
     // Following removes the white round edges from the corner.       <<<<<<<<-------------   
     navController.view.superview.layer.cornerRadius = 8;
     navController.view.superview.layer.borderColor = [UIColor clearColor].CGColor;
     navController.view.superview.layer.borderWidth = 2;
     navController.view.superview.clipsToBounds = YES;
 [navController release];
        [ctrl release];