When hiding the statusbar my navigation bar moves up in iOS7
You can create a custom UIView with its frame as
customView.frame=CGRectMake(0, 20, self.view.frame.size.width, self.view.frame.size.height);Also hide your status bar by following the below steps
Go to info.plist and add two attributes if not present. set "Status bar is initially hidden" to YES and set UIViewControllerBasedStatusBarAppearance to NO. This will hide status bar for your app.
Add this code in your view Controller:
if ([self respondsToSelector:@selector(setEdgesForExtendedLayout:)]){ self.edgesForExtendedLayout = UIRectEdgeNone;}
You should use of positionForBar: method of UIBarPositioningDelegate Protocol.
I don't want to put another answer or copy/past so you should take closer look at following question\answers. :)
iOS 7 Status Bar Collides With NavigationBar
iOS 7 UIToolBar Overriding With Status Bar
statusbar overlapping content in iOS7