How to make the incall overlay not push the ui downwards

Question

I have an iOS app. It works great. Except when the user has a hotspot on or is in a call but the call app is minimised

The extended height of the status bar pushes m

Answer 1

I used use "Vertical space - Bottom layout Guide - Button". This way, a button I have on the bottom of the screen stays in the same place when there is an in call bar and if a different screen size is used (3.5inch or 4icnh).

Answer 2

The Simplest Solution is to make sure that your view's springs-and-struts or Autolayout properties allow for compression or expansion of the view , If you have some complex UI then you can implement UIApplicationWillChangeStatusBarFrameNotification observer.

You can handle the UIApplicationWillChangeStatusBarFrameNotification and UIApplicationDidChangeStatusBarOrientationNotification notifications which will tell you the new size of the status bar.

If you are intent on using a transform on your view to handle resizing, you can implement -viewWillLayoutSubviews in your view controllers (probably in a common base class) to set a transform on the root view of the view controller.

-(void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(statusFrameChanged:)
                                                 name:UIApplicationWillChangeStatusBarFrameNotification
                                               object:nil];
}

-(void)viewDidDisappear:(BOOL)animated
{
    [super viewDidDisappear:animated];
    [[NSNotificationCenter defaultCenter] removeObserver:self
                                                    name:UIApplicationWillChangeStatusBarFrameNotification
                                                  object:nil];
}

- (void)statusFrameChanged:(NSNotification*)note
{
    CGRect statusBarFrame = [note.userInfo[UIApplicationStatusBarFrameUserInfoKey] CGRectValue];
    CGFloat statusHeight = statusBarFrame.size.height;

    UIScreen *screen = [UIScreen mainScreen];
    CGRect viewRect = screen.bounds;

    viewRect.size.height -= statusHeight;
    viewRect.origin.y = statusHeight;
    self.view.frame = viewRect;
    [self.view setNeedsLayout];
}

- (void)viewWillLayoutSubviews
{
    [super viewWillLayoutSubviews];

    CGRect baseFrame = self.view.frame;
    // 548.0 is the full height of the view.  Update as necessary.
    CGFloat scale = self.view.frame.size.height / 548.0;
    [self.view setTransform:CGAffineTransformMakeScale(1.0, scale)];
    self.view.frame = baseFrame;
}