Possible Duplicate:
What does @synthesize window=_window do?
How come when you @synthesize something like buttonPressed , You need to do this:
@synthesize buttonPressed = buttonPressed_;
I've been following some tutorials and this keeps coming up. Why?
You do not have to do it that way.
By default, @synthesize variableName does work, if your synthesized accessors shall have the same name as your instance variable.
In your example, the instance variable is called buttonPressed_ but your accessor methods will omit the _ and thus just be called setButtonPressed and buttonPressed.
