Detecting iPhone camera orientation

Question

I\'m getting inconsistent results depending on whether I get the image directly from the camera in the callback or choosing it from the camera roll.

In the UIImag

Answer 1

I have read somewhere that the UIImagePickerController doesn't turn on listening to hardware orientation events, so you may need to call

[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];

before you capture images in your own app. I'm about to go try testing this myself, so I hope it works!

Answer 2

I have tried the imageOrientation property after the picture has been taken, it's funny because I have the orientation values messed up. Up is Left, Down is Right, Left is Down and Right is Up, for example, if I hold the iPhone "Up" (the normal position) then imageOrientation is "UIImageOrientationRight".

- (void)imagePickerController:(UIImagePickerController *)picker
  didFinishPickingImage:(UIImage *)image
      editingInfo:(NSDictionary *)editingInfo {
    switch (image.imageOrientation) {
      case UIImageOrientationUp: //Left
       break;
      case UIImageOrientationDown: //Right
       break;
      case UIImageOrientationLeft: //Down
       break;
      case UIImageOrientationRight: //Up
       break;
      default:
       break;
     }
}

Currently I am using 4.1 SDK GM (xcode_3.2.4_and_ios_sdk_4.1_gm_seed) targeting for iOS 3.1

Answer 3

I posted this to the Apple forums, and got the explanation:

"The camera is actually landscape native, so you get up or down when you take a picture in landscape and left or right when you take a picture in portrait (depending on how you hold the device)."

See:

https://devforums.apple.com/message/301160#301160

Thanks:

https://devforums.apple.com/people/Rincewind