Limit UIPanGestureRecognizer to 1 object at 1 time in array - objective-c

Question

How do i set the panning off when the other object is currently using it?
Eg, when i'm panning on 1 object, the other object should not move. Currently i'm able to pan 2 object.
Another way is to set the panning min touch to 2, which i don't want.
My main code:
UIPanGestureRecognizer *imagePanGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:#selector(moveImage:)];
imagePanGesture.delegate = self;
[tempImageView addGestureRecognizer:imagePanGesture];
[currentImageArray addObject:tempImageView];
- (void)moveImage:(UIPanGestureRecognizer *)recognizer
{
CGPoint translation = [recognizer translationInView:self.view];
recognizer.view.center = CGPointMake(recognizer.view.center.x + translation.x,
recognizer.view.center.y + translation.y);
[recognizer setTranslation:CGPointMake(0, 0) inView:self.view];
if (recognizer.state == UIGestureRecognizerStateEnded)
{
CGPoint velocity = [recognizer velocityInView:self.view];
CGFloat magnitude = sqrtf((velocity.x * velocity.x) + (velocity.y * velocity.y));
CGFloat slideMult = magnitude / 200;
float slideFactor = 0.1 * slideMult; // Increase for more of a slide
CGPoint finalPoint = CGPointMake(recognizer.view.center.x + (velocity.x * slideFactor),
recognizer.view.center.y + (velocity.y * slideFactor));
finalPoint.x = MIN(MAX(finalPoint.x, 0), self.view.bounds.size.width);
finalPoint.y = MIN(MAX(finalPoint.y, 0), self.view.bounds.size.height);
[UIView animateWithDuration:slideFactor*2 delay:0 options:UIViewAnimationOptionCurveEaseOut animations:^{
recognizer.view.center = finalPoint;
} completion:nil];
}
}
i figured out how to do it. Before panning, compare the view.
if(recognizer.view == [currentImageArray objectAtIndex:iCurrentImageTag])

Answer 1

i figured out how to do it. Before panning, compare the view.
if(recognizer.view == [currentImageArray objectAtIndex:iCurrentImageTag])

Answer 2

The correct way to do this would be in the GestureRecognizer Delegate:
https://developer.apple.com/library/prerelease/ios/documentation/UIKit/Reference/UIGestureRecognizerDelegate_Protocol/index.html
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer