Need Code for Aiming a Ball (Swift Coding Language Only!)

Hello, I am working on a Sprite Kit game that involves aiming and releasing a ball towards where the player was aiming when they let go of the screen. However, I don't know how to code this (in Swift). I would like the aiming to work similar to how it works in the iPhone game known as "Ballz". Can someone please code this aiming mechanism for me in Swift? *I would prefer that SKActions are utilized. Please write notes in your code so I know what everything does. (It must be in Swift! I will not accept it if it is in any other coding language). I don't expect this to cost much as I am just asking you to do one thing.