I've been using the BWStatusBarOverlay in some of my Apps to visualize a Down-/Upload Progress, as well as other Status-Messages, now an App using this Library has been rejected.
10.1 We found that your app does not comply with the Apple iOS Human Interface Guidelines, as required by the App Store Review Guidelines. The app includes the use of an overlay on top of the UIStatusBar. It may be helpful to review the iOS Human Interface Guidelinesto help ensure your app is in compliance with these terms and conditions.
The easiest, and at this point, most accurate solution was to replace and removed the BWStatusBarOverlay by an ordinary spinning loader. Seems to me I've got to look out for a new neat mechanism to visualize loading processes without interrupting UX.