Sprite Kit detect position of touch

Question

I want to run different actions depending on if you touch the left or right half of the screen. So an action when you touch the left half, and another when the right half is touched.

I suppose I could make a transparent button image that covers half of the screen and use this code to run an action when touched, but I don't think that's the way to go. Is there a better way to detect the position of a touch?

You can use a gesture recognizer instead of buttons. Then take the location of the touch event and determine where that point lies on the screen. http://stackoverflow.com/questions/16618109/how-to-get-uitouch-location-from-uigesturerecognizer — Dan Watkins, Feb 12 '14 at 20:30
Thanks for your help, but I think I came up with a pretty good solution. (see answer) — user2255273, Feb 12 '14 at 20:42

score 5 · Accepted Answer · answered Feb 12 '14 at 20:44

5

Override the touchesEnded:withEvent or touchesBegan:withEvent: method to do this:

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{
    UITouch *touch = [touches anyObject];

    if(touch){
        if([touch locationInView:self.view]>self.size.width/2){
            [self runTouchOnRightSideAction];
        }else{
            [self runTouchOnLeftSideAction];
        }
    } 
}

answered Feb 12 '14 at 20:44

67cherries

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Thanks, but I just found the solution and posted it a couple of minutes ago. – user2255273 Feb 12 '14 at 20:48
@user2255273 sorry about that, I was in the middle of writing my answer when you posted yours. – 67cherries Feb 12 '14 at 20:49
No problem, your version is cleaner! Thanks – user2255273 Feb 12 '14 at 20:54

score 3 · Answer 2 · answered Feb 12 '14 at 20:41

I came up with the following code and it works perfect.

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {

    UITouch *touch = [touches anyObject];
    CGPoint touchLocation = [touch locationInNode:self];

    // If left half of the screen is touched
    if (touchLocation.x < self.size.width / 2) {
        // Do whatever..
    }

    // If right half of the screen is touched
    if (touchLocation.x > self.size.width / 2) {
        // Do whatever..
    }
}

Sprite Kit detect position of touch

2 Answers2