supportedInterfaceOrientations implementation that allows all orientations on iPad, all but upside-down on the iPhone 6 Plus, and portrait-only for others. But it feels dirty...

gistfile1.txt

- (NSUInteger)supportedInterfaceOrientations
{
    UIInterfaceOrientationMask rtnOrientationMask = UIInterfaceOrientationMaskPortrait;

    if ( UIDevice.currentDevice.userInterfaceIdiom == UIUserInterfaceIdiomPad ) {
        rtnOrientationMask = UIInterfaceOrientationMaskAll;
    } else if ( [UIScreen mainScreen].bounds.size.height > 600.0f || [UIScreen mainScreen].bounds.size.width > 600.0f ) {
        rtnOrientationMask = UIInterfaceOrientationMaskAllButUpsideDown;
    } else {
        rtnOrientationMask = UIInterfaceOrientationMaskPortrait;
    }
    
    return rtnOrientationMask;
}