The proper way to enable landscape orientation only for some devices in iOS 8.3

Question

I'm developing an Universal App in iOS SDK 8.3 and I'm using UISplitViewController. For some reasons I want to enable landscape orientation only for iPads and iPhone 6 Plus.

I can't find out a proper way to obtain this and for the moment I'm using this 'poor' work around that overrides a function of UIApplicationDelegateProtocol

- (NSUInteger) application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)
{
   if (window.traitCollection.userInterfaceIdiom == UIUserInterfaceIdiomUnspecified)
      return UIInterfaceOrientationMaskAll;

   if (window.traitCollection.userInterfaceIdiom == UIUserInterfaceIdiomPad)
      return UIInterfaceOrientationMaskAll;

   if (window.traitCollection.horizontalSizeClass == UIUserInterfaceSizeClassRegular)
      return UIInterfaceOrientationMaskAllButUpsideDown;

   //iPhone 6 plus detected.
   if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone
    && MAX([UIScreen mainScreen].bounds.size.height,[UIScreen mainScreen].bounds.size.width) == 736)
      return UIInterfaceOrientationMaskAll;

   return UIInterfaceOrientationMaskPortrait;
}

Is there an elegant and 'safe' way to obtain the same result?

Answer 1

Enable your Landscape Device Orientation in Deployment Info. Then put these macros for references:

 #define IS_IPAD (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
 #define IS_IPHONE (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)
 #define IS_RETINA ([[UIScreen mainScreen] scale] >= 2.0)

 #define SCREEN_WIDTH ([[UIScreen mainScreen] bounds].size.width)
 #define SCREEN_HEIGHT ([[UIScreen mainScreen] bounds].size.height)
 #define SCREEN_MAX_LENGTH (MAX(SCREEN_WIDTH, SCREEN_HEIGHT))
 #define SCREEN_MIN_LENGTH (MIN(SCREEN_WIDTH, SCREEN_HEIGHT))

 #define IS_IPHONE_4_OR_LESS (IS_IPHONE && SCREEN_MAX_LENGTH < 568.0)
 #define IS_IPHONE_5 (IS_IPHONE && SCREEN_MAX_LENGTH == 568.0)
 #define IS_IPHONE_6 (IS_IPHONE && SCREEN_MAX_LENGTH == 667.0)
 #define IS_IPHONE_6P (IS_IPHONE && SCREEN_MAX_LENGTH == 736.0)

3. Determine your preferred Interface Orientation in your ViewController

using these method:

- (BOOL) shouldAutorotate {
BOOL shouldRotate = (IS_IPAD || IS_IPHONE_6P) ? YES : NO;
return shouldRotate;
}

- (NSUInteger) supportedInterfaceOrientations {
 NSUInteger orientation = (IS_IPAD || IS_IPHONE_6P) ? UIInterfaceOrientationMaskLandscape : UIInterfaceOrientationMaskPortrait;
 return orientation;
 }

 - (UIInterfaceOrientation) preferredInterfaceOrientationForPresentation {
 UIInterfaceOrientation interface = (IS_IPAD || IS_IPHONE_6P) ? (UIInterfaceOrientationLandscapeLeft | UIInterfaceOrientationLandscapeRight) : UIInterfaceOrientationPortrait;
 return interface;
 }