Detect which key is pressed [closed]

问题

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Closed 7 years ago.

How do I tell which key was pressed in a Cocoa Application (I know each key has an associated number)? In my case, I want to log the key to the console.

This is my code:

- (BOOL)acceptsFirstResponder {
return YES;
}


-(void)keyUp:(NSEvent*)event {
NSLog(@"Key %@", event);
}

回答1:

Use the NSEvent methods keyCode, characters or charactersIgnoringModifiers.

- (void)keyUp:(NSEvent *)event {
    NSLog(@"Characters: %@", [event characters]);
    NSLog(@"KeyCode: %hu", [event keyCode]);
}

回答2:

NSEvent has the keyCode method that returns exactly what you're looking for.

来源：https://stackoverflow.com/questions/12770980/detect-which-key-is-pressed