objective c - UIAlertController:supportedInterfaceOrientations was invoked recursively -

when 2 alert present 1 one, means 1 alert present , on them alert presenting , app crashing. have used uialertcontroller display alert. app crashing in ios 9 device.

please me @ point.

this bug in ios 9 failed retrieve supportedinterfaceorientations uialertcontroller. , seems dropped infinite recursion loop in looking supportedinterfaceorientations uialertcontroller (e.g., tracks uialertcontroler -> uiviewcontroller -> uinavigationcontroller -> uitabbarcontroller -> uialertcontroller -> ...), while call uialertcontroller:supportedinterfaceorientations not implemented/overridden in source code.

in solution, added following piece of code:

extension uialertcontroller {          public override func supportedinterfaceorientations() -> uiinterfaceorientationmask {         return uiinterfaceorientationmask.portrait     }     public override func shouldautorotate() -> bool {         return false     } } 

then uialertcontroller directly return supported orientation value without infinite loop. hope helps.

edit: swift 3.0.1

extension uialertcontroller {     open override var supportedinterfaceorientations: uiinterfaceorientationmask {         return uiinterfaceorientationmask.portrait     }       open override var shouldautorotate: bool {         return false     } }