ios - Running code in app regardless of view -


i want app trigger action when iphone's orientation changes, regardless of user in app.

i'm using 

if (([[uidevice currentdevice] orientation] == uideviceorientationlandscapeleft) ||          ([[uidevice currentdevice] orientation] == uideviceorientationlandscaperight)) {   }

to check orientation of device.

where put code run if orientation changes?

in app delegate, register uideviceorientationdidchangenotification notification.

then in selector notification, can perform if check.

- (bool)application:(uiapplication *)application didfinishlaunchingwithoptions:(nsdictionary *)launchoptions {     [[nsnotificationcenter defaultcenter] addobserver:self selector:@selector(orientationchange) name: uideviceorientationdidchangenotification object:nil];      // else had in method }  - (void)orientationchange {     if (([[uidevice currentdevice] orientation] == uideviceorientationlandscapeleft) ||          ([[uidevice currentdevice] orientation] == uideviceorientationlandscaperight)) {     } }

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