現在タッチされてる指の数を
[[event allTouches] count]
で取得できるってのを知りませんでした；
[touches allObjects]
でそのイベントをトリガーしたタッチを取得できるのは知ってたんですが；
I didn't know that I can get the number of fingers that are currently touching by doing this:
[[event allTouches] count]
I only knew this
[touches allObjects]
which retrieves only the touches that triggered the event.