how do I associate a UISwipeGestureRecognizer with one side of the screen? - ios

Question

I have been attempting to figure out how I can associate one UISwipeGestureRecognizer with the right half of the screen and another UISwipeGesture recognizer with the other half of the screen, however, I have been unsuccessful in coding this mechanic properly. Below is my current code. I have no idea on how I can associate one of the swipe recognizers with one half of the screen. Any help would be much appreciated
-(void)didMoveToView:(SKView *)view {
UISwipeGestureRecognizer *leftSwipe1 = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:#selector(leftSwiped1)];
[leftSwipe1 setDirection:UISwipeGestureRecognizerDirectionLeft];
[leftSwipe1 setNumberOfTouchesRequired:1];
[self.view addGestureRecognizer:leftSwipe1];
UISwipeGestureRecognizer *rightSwipe1 = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:#selector(rightSwiped1)];
[rightSwipe1 setDirection:UISwipeGestureRecognizerDirectionRight];
[rightSwipe1 setNumberOfTouchesRequired:1];
[self.view addGestureRecognizer:rightSwipe1];
self.physicsWorld.gravity = CGVectorMake(0, -9.8);
self.physicsWorld.contactDelegate = self;
}
-(void)rightSwiped1 {
SKNode *person1 = [self childNodeWithName:#"person1"];
SKAction *moveRight = [SKAction moveTo:CGPointMake(CGRectGetMidX(self.frame) - 80, CGRectGetMidY(self.frame) + 200) duration:0.2f];
[person1 runAction:moveRight];
}
-(void)leftSwiped1 {
SKNode *person1 = [self childNodeWithName:#"person1"];
SKAction *moveLeft = [SKAction moveTo:CGPointMake(CGRectGetMidX(self.frame) - 400, CGRectGetMidY(self.frame) + 200) duration:0.2f];
[person1 runAction:moveLeft];
}

Answer 1

In a nutshell; You will have to do the filtering yourself.
In the documentation for UISwipeGestureRecognizer it states:
You may determine the location where a swipe began by calling the
UIGestureRecognizer methods locationInView: and
locationOfTouch:inView:. The former method gives you the centroid if
more than one touch was involved in the gesture; the latter gives the
location of a particular touch.
For example: For the left swipe gesture you will do something like
First change your initWithTarget action selector to take an argument like this
UISwipeGestureRecognizer *leftSwipe1 = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:#selector(leftSwiped1:)];
Then in your handler do something like this:
-(void)leftSwiped1:(UIGestureRecognizer *)gestureRecognizer {
CGPoint pt = [gestureRecognizer locationInView:self.view];
if(pt.x < (self.view.bounds.size.width/2))
{
SKNode *person1 = [self childNodeWithName:#"person1"];
SKAction *moveLeft = [SKAction moveTo:CGPointMake(CGRectGetMidX(self.frame) - 400, CGRectGetMidY(self.frame) + 200) duration:0.2f];
[person1 runAction:moveLeft];
}
}