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iOS Build a Simple iPhone App (iOS7) Animating and Intercepting Events Intercepting Touch Events

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

when I type in -(void) tochesBegan,

xcode automatically fills in the code for me and it's somewhat different from amit's coding:

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

This code doesn't work when I run the app. I had to erase <UITouch*> to make it work.

Can someone explain what is this UITouch and why?