iOS: Drag Effect not working well - ios

Question

I have implemented the drag effect on an image but during my test I see that the image is moving only on the click mouse event.
I cannot move my image with the mouse on my screen through the drag event. But when I click on a side of my screen the image take the place where I have clicked.
I followed many topics on youtube but finally, I haven't the same behavior.
This my code:
ScreenView1.h
IBOutlet UIImageView *image;
ScreenView1.m
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
UITouch *touch = [[event allTouches] anyObject];
CGPoint location = [touch locationInView:touch.view];
image.center = location;
[self ifCollision];
}
-(void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
[self touchesBegan:touches withEvent:event];
}

Answer 1

If you want to drag an image view, you will be so much happier using a UIPanGestureRecognizer. It makes this sort of thing trivial. Using touchesBegan is so iOS 4!
UIPanGestureRecognizer* p =
[[UIPanGestureRecognizer alloc] initWithTarget:self
action:#selector(dragging:)];
[imageView addGestureRecognizer:p];
// ...
- (void) dragging: (UIPanGestureRecognizer*) p {
UIView* vv = p.view;
if (p.state == UIGestureRecognizerStateBegan ||
p.state == UIGestureRecognizerStateChanged) {
CGPoint delta = [p translationInView: vv.superview];
CGPoint c = vv.center;
c.x += delta.x; c.y += delta.y;
vv.center = c;
[p setTranslation: CGPointZero inView: vv.superview];
}
}

Answer 2

You're not doing the right thing in the touchesMoved:withEvent:, which is why the drag won't work. Here's a little code that works:
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint location = [touch locationInView:self];
[CATransaction begin];
[CATransaction setDisableActions:YES];
[image setCenter:location];
[CATransaction commit];
}

Answer 3

For the others, I have implemented my issue in that way:
- (IBAction)catchPanEvent:(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];
}
thank you again Matt!