Open Radar

 
Summary: When passing a rather large image (i.e. iPad 2 camera photos are too small, but iPhone 4/the new iPad's camera photos are large enough) with an image orientation other than UIImageOrientationUp, the image when uploading to Facebook using the UIActivityTypePostToFacebook is rotated incorrectly.

Steps to Reproduce: Pass a large NSData to a UIActivityViewController (do NOT pass a UIImage, as there is a bug which causes UIImages with an imageOrientation other than UIImageOrientationUp to appear orientated incorrectly as well, rdar://12034547. That bug is NOT the same as this bug.), present the UIActivityViewController, and then tap "Facebook". 

Expected Results: The image is in the same orientation as the one posted 

Actual Results: The image is in the orientation it would be if it had no imageOrientation set.

Regression: Only if the image is larger than a certain size will the image be rotated incorrectly.

Notes: I'm guessing the system resizes the photo if it is larger than Facebook's maximum image size, but when it does it doesn't preserve the image orientation.

Included is a sample app which demonstrates this issue. This must be run on the new iPad with iOS 6, as that is the only iPad with a high enough camera resolution. First, launch the app and then tap the "Take Picture" button. Take a picture with the device in the orientation UIDeviceOrientationPortrait, UIDeviceOrientationLandscapeLeft, or UIDeviceOrientationLandscapeRight, and then once you're done tap the action button at the bottom of the screen. Tap Facebook, and see the image rotated incorrectly. To confirm this happens with UIImages too, you can uncomment this line in ViewController.m:

//#define kUseUIImageAsActivityItem

which will cause the app to pass UIImages to the UIActivityViewController. Note however ALL sharing options will have the image rotated incorrectly.