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POWeird behavior when rotating AVFoundation stills on iOS
 

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  1. POWeird behavior when rotating AVFoundation stills on iOS
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    <p>OK, so the following code works, but I don't get why. I am capturing still images from the Front camera using AVFoundation. I have this code before initiating capture:</p> <pre><code>if ([connection isVideoOrientationSupported]) { AVCaptureVideoOrientation orientation; switch ([UIDevice currentDevice].orientation) { case UIDeviceOrientationPortraitUpsideDown: orientation = AVCaptureVideoOrientationPortraitUpsideDown; break; case UIDeviceOrientationLandscapeLeft: orientation = AVCaptureVideoOrientationLandscapeRight; break; case UIDeviceOrientationLandscapeRight: orientation = AVCaptureVideoOrientationLandscapeLeft; break; default: orientation = AVCaptureVideoOrientationPortrait; break; } [connection setVideoOrientation:orientation]; } </code></pre> <p>and then this in the <code>captureStillImageAsynchronouslyFromConnection:completionHandler:</code> to store the image:</p> <pre><code>NSData *imageData = [AVCaptureStillImageOutputjpegStillImageNSDataRepresentation:imageSampleBuffer]; UIImage *i = [UIImage imageWithData:imageData]; orientation:i.imageOrientation]; UIGraphicsBeginImageContext(i.size); [i drawAtPoint:CGPointMake(0.0, 0.0)]; image.image = UIGraphicsGetImageFromCurrentImageContext(); </code></pre> <p>as you can see, I don't rotate the image or anything, just draw it in the context and save. But as soon as I try to use <code>i</code> it is always rotated by 90 degrees. If I try to rotate it using </p> <pre><code>UIImage *rotated = [[UIImage alloc] initWithCGImage:i.CGImage scale:1.0f orientation:i.imageOrientation]; </code></pre> <p>it doesn't work (no change from just using <code>i</code>).</p> <p>I understand that UIImage might just draw the image into the context using the right orientation automatically, but WTF?</p>
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