Set photo for UIScrollView

gistfile1.m

- (void)viewDidLoad
{
[super viewDidLoad];
self.title = _photoName;

_imageView.image = _image;
_imageView.frame = (CGRect){CGPointZero, _imageView.image.size};

_scroller.contentSize = _imageView.image.size;
_scroller.minimumZoomScale = .3;        
_scroller.maximumZoomScale = 3;
_scroller.delegate = self;
_scroller.scrollEnabled = YES;
[_scroller setBackgroundColor:[UIColor blackColor]];

[_scroller addSubview:_imageView];

CGFloat width = _imageView.image.size.width;
CGFloat height = _imageView.image.size.height;
CGRect rect;

if (width > height) {
    rect = CGRectMake(0, 0, 1, height+150);
} else {
    rect = CGRectMake(0, 0, width, 1);
}

[_scroller zoomToRect:rect animated:NO];

}