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Hey everyone! I’m quite new to Cocoa, and I’m a little embarrassed to say that I’m having trouble understanding how to get my program to respond to keystrokes. As such, I’m trying to write a program that draws a black rectangle that increases in length every time the user hits the ‘c’ key. So far it just draws a black rectangle on a blue background, and nothing at all happens when the user hits ‘c’.

Here is what I have thus far:

Input.h #import <Cocoa/Cocoa.h>

@interface Input : NSView {

int length;


Input.m #import “Input.h”

@implementation Input

I copied and pasted the keyDown method from another site, and needless to say I don’t really understand it. To my eyes, this program ought to work if pressing ‘c’ calls the keyDown method. My conclusion is that it doesn’t (call keyDown that is, obviously it doesn’t work). So how can I get this functioning? I’ve seen FirstResponder referenced a few places talking about event handling, but I’m afraid I wasn’t able to glean enough from those articles to apply accepting user input. Do I have to somehow implement FirstResponder? Basically, I’m clueless and new. Please help!