I've a four tabs TabBarController. The first tab is selected and loaded whenever the view is showing up. It's a view with a webview as subview. Now showing up the first time I found a white space between the NavigationBar and the beginning of the WebView. Clicking on the second tab and clicking back to the first the space disappears. (sorry not allowed to post an image yet...)
This again happens when I call the TabBarController on a deeper level in my DrillDown App (means every branch in the App ends with a detailled view (containing the tabs). The WebView loads a HTML file and a CSS, tried out to set borders, margins and paddings to 0 or fixed values...no changes.