Not able to move two images using uipangesturerecogniser - ios

Question

I want to move two images with same UIPanGestureRecognizer ,
I am able to move the first image, but as soon as I try to move the second image the first one goes back to its original position. I want the first image to retain it's after changed position.
-(void) viewWillAppear:(BOOL)animated
{
UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:#selector(handlePanSuper:)];
[self.view addGestureRecognizer:pan];
}
- (void)handlePanSuper:(UIPanGestureRecognizer *)sender
{
static UIImageView *viewToMove;
static CGPoint originalCenter;
if (sender.state == UIGestureRecognizerStateBegan)
{
CGPoint location = [sender locationInView:self.view];
if (CGRectContainsPoint(self.imageView.frame, location))
{
viewToMove = imageView;
originalCenter = viewToMove.center;
}
else if (CGRectContainsPoint(self.image2.frame, location))
{
viewToMove = image2;
originalCenter = viewToMove.center;
}
else
{
viewToMove = nil;
}
if (viewToMove)
{
viewToMove.alpha = 0.8;
[viewToMove.superview bringSubviewToFront:viewToMove];
NSLog(#"hi i am being touched.");
}
}
if (sender.state == UIGestureRecognizerStateChanged && viewToMove != nil)
{
CGPoint translation = [sender translationInView:self.view];
viewToMove.center = CGPointMake(originalCenter.x + translation.x, originalCenter.y + translation.y);
}
else if ((sender.state == UIGestureRecognizerStateEnded ||
sender.state == UIGestureRecognizerStateFailed ||
sender.state == UIGestureRecognizerStateCancelled) && viewToMove != nil)
{
// do whatever post dragging you want, e.g.
// snap the piece into place
// CGPoint center = viewToMove.center;
//viewToMove.center = center;
viewToMove.alpha = 1.0;
viewToMove = nil;
}
}

Answer 1

You are setting your gesture recognizer in your superView. Why? You could set it inside the views that you are trying to move, it's easier and less likely to strange behaviors I edited your code, see below (not tested)
-(void) viewWillAppear:(BOOL)animated
{
UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:#selector(handlePanSuper:)];
self.imageView.userInteractionEnabled = self.image2.userInteractionEnabled = YES;
[self.imageView addGestureRecognizer:pan];
[self.image2 addGestureRecognizer:pan];
}
- (void)handlePanSuper:(UIPanGestureRecognizer *)sender
{
UIImageView *viewToMove = (UIImageView*)sender.view;
CGPoint originalCenter = viewToMove.center;
if (sender.state == UIGestureRecognizerStateBegan)
{
CGPoint location = [sender locationInView:self.view];
viewToMove.alpha = 0.8;
[viewToMove.superview bringSubviewToFront:viewToMove];
NSLog(#"hi i am being touched.");
}
else if (sender.state == UIGestureRecognizerStateChanged)
{
CGPoint translation = [sender translationInView:self.view];
viewToMove.center = CGPointMake(originalCenter.x + translation.x, originalCenter.y + translation.y);
}
else if ((sender.state == UIGestureRecognizerStateEnded ||
sender.state == UIGestureRecognizerStateFailed ||
sender.state == UIGestureRecognizerStateCancelled))
{
// do whatever post dragging you want, e.g.
// snap the piece into place
// CGPoint center = viewToMove.center;
//viewToMove.center = center;
viewToMove.alpha = 1.0;
viewToMove = nil;
}
}
Please try this, and let me know if worked.