Detect closer point inside a view from touch - objective-c

Question

There's a way to, when the user touches outside the view, the app detects the closer point inside this view? I want to detect just like the image below.
EDIT:
CGPoint touchPoint = [[touches anyObject] locationInView:self.view];
if (CGRectContainsPoint([_grayView frame], touchPoint)) {
// The touch was inside the gray view
} else {
// The touch was outside the view. Detects where's the closer CGPoint inside the gray view.
// The detection must be related to the whole view (In the image example, the CGPoint returned would be related to the whole screen)
}

Answer 1

static float bound(float pt, float min, float max)
{
if(pt < min) return min;
if(pt > max) return max;
return pt;
}
static CGPoint boundPoint(CGPoint touch, CGRect bounds)
{
touch.x = bound(touch.x, bounds.origin.x, bounds.origin.x + bounds.size.width;
touch.y = bound(touch.y, bounds.origin.y, bounds.origin.y + bounds.size.height;
return touch;
}

Answer 2

All you need is a little math:
Ask the touch for its locationInView: with the view in question as the argument.
Compare the point’s x with the view’s bounds, clamping to the extrema of that CGRect.
There is no step three, the result of the above is the point you are looking for.

Answer 3

Try this code!
CGPoint pt = [touches locationInView:childView];
if(pt.x >= 0 && pt.x <= childView.frame.size.width
&& pt.y >= 0 && pt.y <= childView.frame.size.height) {
NSLog(#"Touch inside rect");
return;
}
pt.x = MIN(childView.frame.size.width, MAX(0, pt.x));
pt.y = MIN(childView.frame.size.height, MAX(0, pt.y));
// and here is the point
NSLog(#"The closest point is %f, %f", pt.x, pt.y);