ios - How to create separate orientation for specific view controller using objective C? -

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i trying programmatically create ui orientation (portrait , landscape) using objective c devices. here problem have multiple view controllers. want use multiple orientation particular view controller. 

for ex:   splash screen (app delegate - portrait) login screen (portrait) home screen (both)

if controlled below method app delegate root class cant enable both orientation home view controller. showing black screen. 

- (nsuinteger) application:(uiapplication *)application supportedinterfaceorientationsforwindow:(uiwindow *)window {      return uiinterfaceorientationmaskportrait; }

you can try following implementation. here doing is, sends interfaceorientation need visible view controller app delegate. fist finds visible viewcontroler , gets supported interface orientation, if supportedinterfaceorientations method not implemented in visible view controller, return default orientation.

- (uiinterfaceorientationmask)application:(uiapplication *)application supportedinterfaceorientationsforwindow:(uiwindow *)window  {     uiviewcontroller *topcontroller = [self topmostviewcontroller];      if ([topcontroller respondstoselector:@selector(supportedinterfaceorientations)]) {         return [topcontroller supportedinterfaceorientations];     }      return uiinterfaceorientationmaskallbutupsidedown; }  - (uiviewcontroller *)topmostviewcontroller {     uiviewcontroller *topcontroller = self.window.rootviewcontroller;      return [self topviewcontrollerwithrootviewcontroller:topcontroller]; }  - (uiviewcontroller *)topviewcontrollerwithrootviewcontroller:(uiviewcontroller *)rootviewcontroller {      if ([rootviewcontroller iskindofclass:[uitabbarcontroller class]]) {         uitabbarcontroller* tabbarcontroller = (uitabbarcontroller*)rootviewcontroller;         return [self topviewcontrollerwithrootviewcontroller:tabbarcontroller.selectedviewcontroller];     } else if ([rootviewcontroller iskindofclass:[uinavigationcontroller class]]) {         uinavigationcontroller* navigationcontroller = (uinavigationcontroller*)rootviewcontroller;         return [self topviewcontrollerwithrootviewcontroller:navigationcontroller.topviewcontroller];// dont use visible view controller, since return presented viewcontroller, may uialertcontroller.     } else if (rootviewcontroller.presentedviewcontroller && ![rootviewcontroller.presentedviewcontroller iskindofclass:[uialertcontroller class]]) {         uiviewcontroller* presentedviewcontroller = rootviewcontroller.presentedviewcontroller;         return [self topviewcontrollerwithrootviewcontroller:presentedviewcontroller];     } else {         return rootviewcontroller;     } }

and if want display view controller orientation other uiinterfaceorientationmaskallbutupsidedown implement following method in view controller

- (uiinterfaceorientationmask)supportedinterfaceorientations {     return <whichever orientation need>; }

update:

make sure selected orientations needed initial view controller in target settings.

ref: finding topmost view controller code this answer slight modification addressing uialertcontroller presented case


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