Drag UIVIew relative to finger - ios

Question

I have a little problem.
I have some UIView and I'm able to drag them with methods touchesBegan and touchesMoved.
My problem is my UIView's coordinates (0,0) is coming under my finger. I would like to avoid that.
Do you know how to do that. I try some things but with no success :(
Thanks a lot !

Answer 1

It will depend on the size of the view but you can probably set the center property to your touch's location.
Animating the center to your tap location
[UIView animateWithDuration:0.25f
delay:0.0f
options:(UIViewAnimationOptionBeginFromCurrentState|UIViewAnimationOptionCurveEaseInOut)
animations:^{
theView.center = tapLocation;
}
completion:NULL]
Instead of just moving the location or translating it, you can animate the view to your current touch in all touches* methods.

Answer 2

when you press down your finger save the point
then measure the speed of the drag, and apply the speed to the position of your view (I translate my view with origin in my exemple)
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
NSUInteger touchCount = [touches count];
NSUInteger tapCount = [[touches anyObject] tapCount];
NSLog(#"touchesBegan");
NSLog(#"%d touches", touchCount);
NSLog(#"%d taps", tapCount);
UITouch *touch = [touches anyObject];
pNow = [touch locationInView:self];
pLast = [touch locationInView:self];
}
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
NSUInteger touchCount = [touches count];
NSUInteger tapCount = [[touches anyObject] tapCount];
NSLog(#"touchesMoved");
NSLog(#"%d touches", touchCount);
NSLog(#"%d taps", tapCount);
UITouch *touch = [touches anyObject];
pNow = [touch locationInView:self];
mouseSpeed.x = pNow.x - pLast.x;
mouseSpeed.y = pNow.y - pLast.y;
NSLog(#"mouseSpeed : %f, %f", mouseSpeed.x, mouseSpeed.y);
origin.x += mouseSpeed.x;
origin.y += mouseSpeed.y;
NSLog(#"origin : %f, %f", origin.x, origin.y);
//copy point for the next update
pLast = pNow;
}