objective c - UIInterfaceOrientationUnknown for what purpose -


in ios 8 have added device orientation detection uiinterfaceorientationunknown (check pre-release documentation here)

  • uiinterfaceorientationunknown

    the orientation of device cannot determined.

    available in ios 8.0 , later.

typedef enum : nsinteger {      uiinterfaceorientationunknown = uideviceorientationunknown,      uiinterfaceorientationportrait = uideviceorientationportrait,      uiinterfaceorientationportraitupsidedown = uideviceorientationportraitupsidedown,      uiinterfaceorientationlandscapeleft = uideviceorientationlandscaperight,      uiinterfaceorientationlandscaperight = uideviceorientationlandscapeleft  } uiinterfaceorientation;

the way see there 4 ways device possibly ever been portrait, upsidedown, landscaperight , landscapeleft. in circumstances ever have device orientation of unknown?

i have faced uiinterfaceorientationunknown state when window creation performed before uiapplication prepared , called applicationdidlaunch on appdelegate.

btw, achieved swizzling magic inside typhoon di framework.


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