On iOS8, displaying my app in landscape mode will hide the status bar but on iOS 7 the status bar is displayed on both orientations

Try this

Add below code in didRotateFromInterfaceOrientation

[[UIApplication sharedApplication] setStatusBarHidden:NO withAnimation:UIStatusBarAnimationNone];

EDIT
NO NEED TO WRITE CODE IN ALL VIEW CONTROLLER
Set View controller-based status bar appearance to NO in plist and add below code in
root view controller’s viewDidLoad

[[UIApplication sharedApplication] setStatusBarHidden:YES withAnimation:UIStatusBarAnimationNone];
[[UIApplication sharedApplication] setStatusBarHidden:NO withAnimation:UIStatusBarAnimationNone];

Demo project
https://www.dropbox.com/s/uumneidk4wom5md/demoStatusBar.zip?dl=0

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