检测按下哪个键[关闭]

我如何知道在 Cocoa 应用程序中按下了哪个键（我知道每个键都有一个关联的数字）？就我而言，我想将密钥记录到控制台。

这是我的代码：

- (BOOL)acceptsFirstResponder {
return YES;
}


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

Use the NSEvent http://developer.apple.com/library/mac/documentation/Cocoa/Reference/ApplicationKit/Classes/NSEvent_Class/Reference/Reference.html方法keyCode https://developer.apple.com/library/mac/documentation/Cocoa/Reference/ApplicationKit/Classes/NSEvent_Class/Reference/Reference.html#//apple_ref/occ/instm/NSEvent/keyCode, characters https://developer.apple.com/library/mac/documentation/Cocoa/Reference/ApplicationKit/Classes/NSEvent_Class/Reference/Reference.html#//apple_ref/occ/instm/NSEvent/characters or charactersIgnoringModifiers https://developer.apple.com/library/mac/documentation/Cocoa/Reference/ApplicationKit/Classes/NSEvent_Class/Reference/Reference.html#//apple_ref/occ/instm/NSEvent/charactersIgnoringModifiers.

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