Touch Detection inside Polygon Shape xCode

Suppose you have some polygon shape like the above pic and you need to find the touch inside this shape.

For this i have made my own logic from various sources and this code is as below

-(BOOL)pointInPolygon:(int)xPos andY:(int) yPos andPolyArray:(NSArray *)poly

{

    int j = poly.count - 1;

    BOOL oddNodes = false;

    for (int i = 0; i <poly.count; i++) {

        NSValue *val = [poly objectAtIndex:i];

        CGPoint pi = [val CGPointValue];

        

        val = [poly objectAtIndex:j];

        CGPoint pj = [val CGPointValue];

        

        if ((pi.y < yPos && pj.y >= yPos) ||  (pj.y < yPos && pi.y >= yPos)) {

            if (pi.x + (yPos - pi.y) / (pj.y - pi.y) * (pj.x - pi.x) <xPos) {

                oddNodes = !oddNodes;

            }

        }

        j = i;

    }

    return oddNodes;

}

In this function you just need to pass X and Y position of Touch location, with the polygon co-ordinates Array.

Now how to create a Polygon Shape Array?

Here is the solution of this, to define a Polygon Shape points

self.trackArea = [NSArray arrayWithObjects:[NSValue valueWithCGPoint:CGPointMake(412,0)],

                  [NSValue valueWithCGPoint:CGPointMake(827,0)],

                  [NSValue valueWithCGPoint:CGPointMake(210,768)],

                  [NSValue valueWithCGPoint:CGPointMake(0,768)],

                  [NSValue valueWithCGPoint:CGPointMake(0,513)],

                  

                  nil];

Now How to call, So here is that

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

{

    [super touchesBegan:touches withEvent:event];

    UITouch *touch = [touches anyObject];

    CGPoint touchPoint = [touch locationInView:self.view];

    if([self pointInPolygon:touchPoint.x andY:touchPoint.y andPolyArray:self.track1Area])

    {

        NSLog(@"Touch Detected for polygon");

    }

}