Best way to check where touched

I’m making an Iphone game where you play against eachother on one screen. What is the most effecient way to check if the top half or the button half of the screen is touched/pressed? Both players should be able to touch at the same time.

When you check the input touches, it may be more then one touch, you will want to iterate through them and check there position, which is just a Vector2(X,Y).

Touch.Position documentation

Vector2 documentation

Input.touches documentation, has example of iterating through the touches collection