A pannable, rotatable and zoomable image with gesture recognizers.

GestureImage.m

- (id)initWithImage:(UIImage *)image {
    if ((self = [super initWithImage:image])) {
        self.userInteractionEnabled = YES;
        self.multipleTouchEnabled = YES;
        _pinchGestureRecognizer = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchRecognized:)];
        [self addGestureRecognizer:_pinchGestureRecognizer];
        _pinchGestureRecognizer.delegate = self;
        _panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panRecognized:)];
        [self addGestureRecognizer:_panRecognizer];
        _panRecognizer.delegate = self;
        _rotationRecognizer = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotationRecognized:)];
        [self addGestureRecognizer:_rotationRecognizer];
        _rotationRecognizer.delegate = self;
    }
    return self;
}

#pragma mark -
#pragma mark Touch Handling

- (void)pinchRecognized:(UIPinchGestureRecognizer *)gestureRecognizer {
    switch (gestureRecognizer.state) {
        case UIGestureRecognizerStateChanged:
        case UIGestureRecognizerStateRecognized:
            self.transform = CGAffineTransformScale(self.transform, gestureRecognizer.scale, gestureRecognizer.scale);
            [gestureRecognizer setScale:1.0];
            break;
        default:
            break;
    }
}

- (void)panRecognized:(UIPanGestureRecognizer *)gestureRecognizer {
    switch (gestureRecognizer.state) {
        case UIGestureRecognizerStateChanged:
        case UIGestureRecognizerStateRecognized:
            CGPoint translation = [gestureRecognizer translationInView:self.superview];
            self.center = CGPointMake(self.center.x + translation.x, self.center.y + translation.y);
            [gestureRecognizer setTranslation:CGPointZero inView:self.superview];
            break;
        default:
            break;
    }
}

- (void)rotationRecognized:(UIRotationGestureRecognizer *)gestureRecognizer {
    switch (gestureRecognizer.state) {
        case UIGestureRecognizerStateChanged:
        case UIGestureRecognizerStateRecognized:
            CGFloat angle = [gestureRecognizer rotation];
            self.transform = CGAffineTransformRotate(self.transform, angle);
            [gestureRecognizer setRotation:0];
            break;
        default:
            break;
    }
}

# pragma mark - 
# pragma mark UITapGestureRecognizerDelegate

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
    return YES;
}