Track tapping coordinates on iPhone - iphone

Question

I want to move UIImageView by tappig the location on the screen. How do I get X, Y coordinates of the tapping finger?

Answer 1

in the viewDidLoad.m, this could do the job :
/* Create the Tap Gesture Recognizer */
self.tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(handleTaps:)];
/* The number of fingers that must be on the screen */
self.tapGestureRecognizer.numberOfTouchesRequired = 1;
/* The total number of taps to be performed before the gesture is recognized */
self.tapGestureRecognizer.numberOfTapsRequired = 1;
/* Add this gesture recognizer to our view */
[self.view addGestureRecognizer:self.tapGestureRecognizer];
And then in the handleTaps: method
- (void) handleTaps:(UITapGestureRecognizer*)paramSender{
NSUInteger touchCounter = 0;
for (touchCounter = 0; touchCounter < paramSender.numberOfTouchesRequired; touchCounter++)
{
CGPoint touchPoint = [paramSender locationOfTouch:touchCounter inView:paramSender.view];
NSLog(#"Touch #%lu: %#", (unsigned long)touchCounter+1, NSStringFromCGPoint(touchPoint));
}
}
Of course, you implement the handleTaps method regarding your needs.

Answer 2

You can use any of below methods
If you want it to be moved on touched begin Event, use this
- (void) touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event{}
If you want it to be moved on touches ended event, use this
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{}
and place the code pasted below
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
CGPoint pt = [[touches anyObject] locationInView:self.view];
imageView.center = CGPointMake(pt.x,pt.y);
}
In Above code , the pt Contains the x and y co-ordinates of your touched location.
Moreover you may also use animations for smoother moves.