Is it possible to get the x and y coordinates of a touch? - ios

Question

is it possible to get the x and y coordinates of a touch? If so could someone please provide a very simple example where the coordinates are just logged to the console.

Answer 1

Using touchesBegan Event
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [[event allTouches] anyObject];
CGPoint touchPoint = [touch locationInView:self.view];
NSLog(#"Touch x : %f y : %f", touchPoint.x, touchPoint.y);
}
This event is triggered when touch starts.
Using Gesture
Register your UITapGestureRecognizer in viewDidLoad: Method
- (void)viewDidLoad {
[super viewDidLoad];
UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(tapGestureRecognizer:)];
[self.view setUserInteractionEnabled:YES];
[self.view addGestureRecognizer:tapGesture];
}
Setting up the tapGestureRecognizer function
// Tap GestureRecognizer function
- (void)tapGestureRecognizer:(UIGestureRecognizer *)recognizer {
CGPoint tappedPoint = [recognizer locationInView:self.view];
CGFloat xCoordinate = tappedPoint.x;
CGFloat yCoordinate = tappedPoint.y;
NSLog(#"Touch Using UITapGestureRecognizer x : %f y : %f", xCoordinate, yCoordinate);
}
Sample Project

Answer 2

First you need to add a gesture recognizer to the view you want.
UITapGestureRecognizer *myTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(myTapRecognizer:)];
[self.myView setUserInteractionEnabled:YES];
[self.myView addGestureRecognizer:myTap];
Then in the gesture recognizer method you make a call to locationInView:
- (void)myTapRecognizer:(UIGestureRecognizer *)recognizer
{
CGPoint tappedPoint = [recognizer locationInView:self.myView];
CGFloat xCoordinate = tappedPoint.x;
CGFloat yCoordinate = tappedPoint.y;
}
You may want to take a look at apple's UIGestureRecognizer Class Reference

Answer 3

Here's a very basic example (place it inside your view controller):
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
CGPoint currentPoint = [touch locationInView:self.view];
NSLog(#"%#", NSStringFromCGPoint(currentPoint));
}
This triggers every time the touch moves. You can also use touchesBegan:withEvent: which triggers when a touch starts, and touchesEnded:withEvent: which triggers when a touch ends (i.e. a finger is lifted).
You can also do this using a UIGestureRecognizer, which in many cases is more practical.