Question

Looking for confirmation or a correction on the following behaviour…

When problematically changing width of a fixed space uibarbuttonitem in UItoolbar via willAnimateRotationToInterfaceOrientation method, the display lags behind showing landscape when in portrait and vice versa after a few rotations. Like it goes one step out of sync.

As isolated test I:

• Created new view based project in iPad
• In IB designer added a uitoolbar to top of view

• and the following uibarbutton items to it:

  left button|--Fixed space--|middle button<--flexible space-->right button
  

• Assign UIBarButtonItemFixedSpace as IBOutlet to “|–Fixed space–|” button

• Add following method to *.m

  -(void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation) interfaceOrientation duration:(NSTimeInterval)duration { 
      if (interfaceOrientation == UIInterfaceOrientationPortrait || interfaceOrientation == UIInterfaceOrientationPortraitUpsideDown){
          UIBarButtonItemFixedSpace.width = 100;
      }else{
          UIBarButtonItemFixedSpace.width = 500;   
      }
  } 
  

Even thought the if statement does fire correctly in respective orientation after a few 90 degree rotations, the display lags one 90 degree rotation behind. Seen in both simulator and iPad iOS 4.3 & Xcode 4

Am I missing something?

Answer 1

Although this does look like a bug, I have moved away from bar buttons and gone with popovers instead…in other words a re-think and re-design in the UI.