For remove UIDevice orientation warning just put bellow code in your file where you want to put fix orientation

For example if you want to your project only support Landscape or Portrait Orientation then when you put bellow line... i.e

-(void)viewWillAppear:(BOOL)animated

{

    [[UIDevice currentDevice] setOrientation:UIInterfaceOrientationLandscapeRight];

}

then its give warning like...

'UIDevice' may not respond to 'setOrientation:'

so for solve this warning just put bellow code where you use this line

@interface UIDevice (MyPrivateNameThatAppleWouldNeverUseGoesHere)

- (void) setOrientation:(UIInterfaceOrientation)orientation;

@end