GGDraggableView.m

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (!self) return nil;

    self.panGestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(dragged:)];
    [self addGestureRecognizer:self.panGestureRecognizer];

    [self loadImageAndStyle];

    self.overlayView = [[GGOverlayView alloc] initWithFrame:self.bounds];
    self.overlayView.alpha = 0;
    [self addSubview:self.overlayView];

    return self;
}