击中钥匙时发出不必要的哔声

Posted 2021-03-31

我有一个自定义视图，接受键输入，它在NSScrollView内。我已将acceptsFirstResponder设置为yes，它正在成功接受keyDown。但每次按下钥匙，我都会听到一声哔哔声。我确信还有其他东西需要但不记得是什么..请帮助。

-(void)keyUp:(NSEvent *)theEvent{

NSLog(@"is first responder %i", self.window.firstResponder == self);

switch (theEvent.keyCode) {
    case KeyCodeEnumBackspace:
    case KeyCodeEnumDelete:
    {
        if (self.scheduleControl.selectedEvent) {
            [self.scheduleControl deleteEvent:self.scheduleControl.selectedEvent];
        }
    }
        break;

    default:
        break;
}
   }

答案

得到它了。哔哔声发生在keyDown，而不是KeyUp。要删除蜂鸣声，我需要处理它，一个空的实现就足够了。关键是不要把它传递给超级

- (void)keyDown:(NSEvent *)theEvent {

}

- (void)keyUp:(NSEvent *)theEvent {
    switch (theEvent.keyCode) {
        case KeyCodeEnumBackspace:
        case KeyCodeEnumDelete:
            if (self.scheduleControl.selectedEvent) {
                [self.scheduleControl deleteEvent:self.scheduleControl.selectedEvent];
            }
            break;
        default:
            break;
    }
}