Untitled

Recognize that in which direction a control dragged
@interface YourImageView : UIImageView
{
    CGPoint previousPt;
    //Other iVars.
}
@end

@implementation YourImageView

- (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    previousPt = [[touches anyObject] locationInView:self.view];
}

- (void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    const CGPoint p = [[touches anyObject] locationInView:self.view];
    if (previousPt.x > p.x)
    {
        //Dragged right to left
    }
    else if  (previousPt.x < p.x)
    {
        //Dragged left to right
    }
    else
    {
        //no move
    }
    //Do the same thing for y-direction
}