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Resetting UIScrollView's zoomScale property on autorotation
-(float) findZoomScale {
    float widthRatio = self.view.bounds.size.width / self.imageView.image.size.width;
    float heightRatio = self.view.bounds.size.height / self.imageView.image.size.height;
    float ratio;
    if (widthRatio > heightRatio) ratio = widthRatio;
    else ratio = heightRatio;
        return ratio;
}

- (void) viewWillAppear:(BOOL)animated {
    [super viewWillAppear:YES];
    self.imageView.image = self.image;
    self.imageView.frame = CGRectMake(0, 0, self.imageView.image.size.width, self.imageView.image.size.height);
    self.scrollView.contentSize = self.imageView.image.size;
    self.scrollView.zoomScale = [self findZoomScale];
        [self.scrollView flashScrollIndicators];
}

- (void)viewDidLoad {
    [super viewDidLoad];
    self.image = [UIImage imageWithData:[NSData dataWithContentsOfURL:self.photoURL]];
    self.imageView.image = self.image;
    self.imageView.frame = CGRectMake(0, 0, self.imageView.image.size.width,
        self.imageView.image.size.height);
    self.scrollView.delegate = self;
    self.scrollView.zoomScale = 1.0;
    self.navigationItem.title = self.photoTitle;
    self.scrollView.autoresizesSubviews = YES;
    self.scrollView.autoresizingMask = (UIViewAutoresizingFlexibleBottomMargin |
        UIViewAutoresizingFlexibleRightMargin | UIViewAutoresizingFlexibleLeftMargin |
        UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleWidth |
        UIViewAutoresizingFlexibleHeight);
}

-(void)viewWillLayoutSubviews