objective c - Unable to force device to change UIOrientation -

i have vc modally adds image picker controller, , goes same vc when pic selected. after obtain image via pickercontroller, add image screen, , want device automatically change landscape if pic landscape, , portrait if pic portrait.

i have unsuccessfully tried both of these approaches force device landscape

1.   [[uiapplication sharedapplication] setstatusbarorientation:uiinterfaceorientationlandscapeleft];  2.  [uiviewcontroller attemptrotationtodeviceorientation];   -(nsuinteger)supportedinterfaceorientations {  if (!isportrait) //isportrait false when pic landscape     return uiinterfaceorientationmasklandscape;  } 

alternatively, i'm wondering if it's best instantiate separate vc picture. i've avoided far after question

my guess have call [[uiapplication sharedapplication] setstatusbarorientation: inside viewwillappear: method of viewcontroller presenting uiimagepickercontroller.

for need know first image orientation, can this:

- (bool)shouldautorotate {     return no; }  - (void) viewdidappear:(bool)animated {     [super viewdidappear:animated];      if(myorientation>0)         [uiapplication sharedapplication].statusbarorientation = myorientation; }  - (void)presentpicker {     uiimagepickercontroller* imgpicker = [[uiimagepickercontroller alloc] init];     imgpicker.delegate = self;     [self presentviewcontroller:imgpicker animated:yes completion:nil]; }  - (void)imagepickercontroller:(uiimagepickercontroller *)picker didfinishpickingmediawithinfo:(nsdictionary *)info {     uiimage* image = [info objectforkey:@"uiimagepickercontrolleroriginalimage"];      if(image.size.width>image.size.height)         myorientation = uiinterfaceorientationlandscapeleft;     else         myorientation = uiinterfaceorientationportrait;      [picker dismissviewcontrolleranimated:yes completion:nil]; } 

also, don't forget set initial , supported interface orientations in plist (the first of supported orientations has equal initial orientation)