how to add rotate photo functionality to MWPhotoBrowser?

Below is my attempt. I added a rightBarButtonItem to the navigation bar. Then connected it with the method below. What am I doing wrong? When I click the button, the method is called, because I see the log. Nothing visible happens when it is called. If I click the button repeatedly, the image flickers however.

- (void)rotatedImage
{
    NSLog(@"rotatedImage");
    id <MWPhoto> assetPhoto =  [self photoAtIndex:_currentPageIndex];
    UIImageOrientation imageOrientation = assetPhoto.underlyingImage.imageOrientation;
    UIImageOrientation orientationToBe;

    if (imageOrientation == UIImageOrientationLeft) orientationToBe = UIImageOrientationDown;
    else if (imageOrientation == UIImageOrientationDown) orientationToBe = UIImageOrientationRight;
    else if (imageOrientation == UIImageOrientationRight) orientationToBe = UIImageOrientationUp;
    else orientationToBe = UIImageOrientationLeft;

    UIImage *rotatedImage = [UIImage imageWithCGImage:[assetPhoto.underlyingImage CGImage] scale: 1 orientation:orientationToBe];

    MWPhoto *r = [MWPhoto photoWithImage:rotatedImage];
    [_photos replaceObjectAtIndex:_currentPageIndex withObject:r];
    [self reloadData];  
}

Solution

is it possible that the -(MWPhoto *) photoWithImage method doesn't read the orientation property of the UIImage? i would try rotating the image by drawing it into a rotated image context and then extracting the rotated image from the context. check out this thread: Creating a UIImage from a rotated UIImageView