ios - 使用 UIKeyCommand 检测连续按键

Question

是否可以连续按键？

我正在使用 keyCommands: 来拦截在外部键盘上按下的箭头键，但每次按下我只会收到 1 次调用。只要按住键，我希望每 X 毫秒收到多次调用，或者在按下和释放键时调用。

这是我的代码:

- (NSArray *)keyCommands
{
    UIKeyCommand *upArrow = [UIKeyCommand keyCommandWithInput:UIKeyInputUpArrow
                                                modifierFlags:0
                                                       action:@selector(upArrow:)];
    UIKeyCommand *downArrow = [UIKeyCommand keyCommandWithInput:UIKeyInputDownArrow
                                                  modifierFlags:0
                                                         action:@selector(downArrow:)];
    UIKeyCommand *leftArrow = [UIKeyCommand keyCommandWithInput:UIKeyInputLeftArrow
                                                  modifierFlags:0
                                                         action:@selector(leftArrow:)];
    UIKeyCommand *rightArrow = [UIKeyCommand keyCommandWithInput:UIKeyInputRightArrow
                                                   modifierFlags:0
                                                          action:@selector(rightArrow:)];
    UIKeyCommand *leftArrowCmd = [UIKeyCommand keyCommandWithInput:UIKeyInputLeftArrow
                                                     modifierFlags:UIKeyModifierCommand
                                                            action:@selector(leftArrowCmd:)];
    UIKeyCommand *rightArrowCmd = [UIKeyCommand keyCommandWithInput:UIKeyInputRightArrow
                                                      modifierFlags:UIKeyModifierCommand
                                                             action:@selector(rightArrowCmd:)];
    UIKeyCommand *lCmd = [UIKeyCommand keyCommandWithInput:@"l"
                                             modifierFlags:UIKeyModifierCommand
                                                    action:@selector(lCmd:)];
    UIKeyCommand *rCmd = [UIKeyCommand keyCommandWithInput:@"r"
                                             modifierFlags:UIKeyModifierCommand
                                                    action:@selector(rCmd:)];
    UIKeyCommand *mCmd = [UIKeyCommand keyCommandWithInput:@"m"
                                             modifierFlags:UIKeyModifierCommand
                                                    action:@selector(mCmd:)];
    return @[upArrow, downArrow, leftArrow, rightArrow, leftArrowCmd, rightArrowCmd, lCmd, rCmd, mCmd];
}

Answer 1

看来这在iOS 7中确实是不可能的。