IPhone - After dismissing Modal View Controller - gap is left at top of page

Question

When starting the app, if the user doesn\'t have login information stored, I want to display a modal view controller to force the entry of this information. I found through

Answer 1

I've had the same problem and here is my solution. Just add this to your AdDelegate:

- (BOOL)bannerViewActionShouldBegin:(ADBannerView *)banner willLeaveApplication:(BOOL)willLeave
{
    if (!willLeave)
        [[UIApplication sharedApplication] setStatusBarHidden:YES animated:YES];
    return YES;
}

- (void)bannerViewActionDidFinish:(ADBannerView *)banner
{
    [[UIApplication sharedApplication] setStatusBarHidden:NO animated:YES];
}

It's very simple; when the ad appears I hide the status bar and when the ad disappears I show it again. I hope the answer helps some people.

Answer 2

For me, my modal view controller was a MoviePlayer and when it would be presented, it seemed that the status bar would be redrawn. When the view was dismissed, this second status bar would somehow create a 20px offset at the bottom of my screen, just above the tabbar controller.

To fix this, when the modal view controller was presented, I would hide the status bar. When the movie had finished playing and the modal view controller was going to be dismissed, I made the status bar visible.

- (void) moviePlayerLoadStateChanged:(NSNotification*)notification 
{
[[UIApplication sharedApplication] setStatusBarHidden:YES];
}


- (void) moviePlayBackDidFinish:(NSNotification*)notification 
{
[[UIApplication sharedApplication] setStatusBarHidden:NO];
}

Answer 3

Turns out this was happening because I was calling my modalviewcontroller on the current view controller, but my view controller already had a another view controller loaded as a subview. Once I changed it to make the view controller in the subview, load the modal, then it went away. Thanks for all your help.

Answer 4

I find that both presenting and dismissing modal view controllers cause this, especially when you want to do custom layouting in -viewDidLoad (which some say you shouldn't, but I've never found a better, working way). What I do is:

[self.view addSubview:self.viewController1.view]; // I suppose this layouts all (sub)views.
[self.viewController1.view removeFromSuperview]; 

Now you can present as such:

    self.viewController1.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
    [self.viewController2 presentModalViewController:self.viewController1 animated:YES];

without risking viewController1 to be laid out in a foul way until transition done, then snapping to wherever it should be. The same applies to dismissing. Works for me on iOS 3.0 though 5.0, iPhone and iPad.

Answer 5

I had the same problem. My solution was to temporarily close the status bar just before switching views:

- (void) temporarilyHideStatusBar {
  [[UIApplication sharedApplication] setStatusBarHidden:YES];
  [self performSelector:@selector(showStatusBar) withObject:nil afterDelay:0];
}
- (void) showStatusBar {
  [[UIApplication sharedApplication] setStatusBarHidden:NO];
}

// Use these by calling the hide function just before a broken view switch:
[self temporarilyHideStatusBar];
[self doViewSwitch];

// No need to call [self showStatusBar]; explicitly.

I experimented with other code-based solutions, and I like this one the best because it works 100% of the time - some of my frame-based solutions only worked most of the time - and because it has minimal user-visible effects.

I suspect this is an Apple bug, and it would be nice to hear the official word from them on the best workaround.

Answer 6

I used @Mark Hammonds answer, but simply reset the frame's offset to 0, ie:

// this won't be called on the parent view if a modal dialog is dismissed. [self.parentViewController viewWillAppear: animated]; 
// actually dismiss the modal dialog. 
[[TOSplitViewController active] dismissModalViewControllerAnimated: animated]; 
// fix the mysterious white bar that appeared on the top. 
[[TOSplitViewController active].view setFrame:CGRectMake(0,0, [TOSplitViewController active].view.frame.size.width, [TOSplitViewController active].view.frame.size.height)];

As you might guess, this was while trying to dismiss a modal dialog presented on top of a split view on an iPad application.

I did try @Tyler's answer, and it didn't work for me.

This on iOS4.1, targeting iPad 3.2.