I got sick of all the non answers to do it some other way people so I put my nose down and figured out a way to make this work. This isn t using keydown event directly but it is using the keydown in the block. And the behavior is exactly what I wanted.

案文领域

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@interface LQRestrictedInputTextField : NSTextField 

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成为首批反应者,举办地方活动

static id eventMonitor = nil;

- (BOOL)becomeFirstResponder {
    BOOL okToChange = [super becomeFirstResponder];
    if (okToChange) {
        [self setKeyboardFocusRingNeedsDisplayInRect: [self bounds]];

        if (!eventMonitor) {
            eventMonitor = [NSEvent addLocalMonitorForEventsMatchingMask:NSKeyDownMask handler:^(NSEvent *event) {

                NSString *characters = [event characters];
                unichar character = [characters characterAtIndex:0];
                NSString *characterString=[NSString stringWithFormat:@"%c",character];

                NSArray *validNonAlphaNumericArray = @[@" ",@"(",@")",@"[",@"]",@":",@";",@" ",@""",@".",@"<",@">",@",",@"{",@"}",@"|",@"=",@"+",@"-",@"_",@"?",@"#",
                                                   @(NSDownArrowFunctionKey),@(NSUpArrowFunctionKey),@(NSLeftArrowFunctionKey),@(NSRightArrowFunctionKey)];

                if([[NSCharacterSet alphanumericCharacterSet] characterIsMember:character] || character == NSCarriageReturnCharacter || character == NSTabCharacter || character == NSDeleteCharacter || [validNonAlphaNumericArray containsObject:characterString ] ) { //[NSCharacterSet alphanumericCharacterSet]
                }  else {
                    NSBeep();
                    event=nil;
                }
                return event;
            } ];

        }
    }
    NSLog(@"become first responder");
    return okToChange;
}

一俟文本现场编辑结束活动

另外,如果你重新使用ARC I,就会发现你可能需要将描述的文字概略交给地狱。 我的先令和价值被保留。 在没有ns语的情况下,我必须把指向斯特鲁韦的通知标语保留下来,以免其被释放。

-(void) textDidEndEditing:(NSNotification *)notification {
    [NSEvent removeMonitor:eventMonitor];
    eventMonitor = nil;

    NSTextView *textView=[notification object];
    self.stringValue=textView.string;
}

你们可以将NStext Field分类,并使用NSText Field的钥匙。

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@interface MyTextField : NSTextField <NSTextFieldDelegate>

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-(void)keyUp:(NSEvent *)theEvent {
    NSLog(@"Pressed key in NStextField!");
}