用户连续点击同一个按钮，如何判断用户间断了3秒以上没有点击？

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debounce(防抖)

# coffescript
debounce: (fn, context, wait)->
    tid = null
    # if content is a number, assign it to wait
    if not isNaN context
      wait = context if context > 0
      context = undefined
    wait = 200 if isNaN(wait) or wait < 0

    ->
      args = arguments
      clearTimeout tid
      tid = setTimeout ->
        fn?.apply context, args
        return
      , wait
      return

debounce(防抖)和throttle(节流)

以上为前端语法，参考原理

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// 点击发送按钮

• (void)giftSendViewPressedSendBtn:(DNGiftSendView *)giftSendView {

  // 礼物单元格数据模型
  NSIndexPath *currentIndexPath = giftSendView.viewModel.currentIndexPath;
  NSArray<DNGiftSendViewCellViewModel > cellmodels = [giftSendView.viewModel.cellViewModels objectAtIndex:currentIndexPath.section];
  DNGiftSendViewCellViewModel *cellmodel = [cellmodels objectAtIndex:currentIndexPath.row];

  // 提示
  if (!currentIndexPath) {

  [DNToastView showToastWith:@"请选择礼物"];
  return;

  }

  // 发送礼物时间间隔定时器 init
  [self giftSendViewScheduledTimerInitWithDuration:kGiftSendViewScheduledTimerInitWithDuration andGift:cellmodel.gift];

  // 发送礼物
  [[self class] cancelPreviousPerformRequestsWithTarget:self selector:@selector(giftSendViewSendGifts) object:nil];
  [self performSelector:@selector(giftSendViewSendGifts) withObject:nil afterDelay:kGiftSendViewSendGiftDelayDuration];

}

// 发送礼物时间间隔定时器 init

• (void)giftSendViewScheduledTimerInitWithDuration:(NSTimeInterval)interval andGift:(DNGift *)gift {

  if (!_giftSendViewScheduledTimer) {

  __weak typeof (self) weakSelf = self;
  
  _giftSendViewScheduledTimer = [NSTimer scheduledTimerWithTimeInterval:interval firing:^{
  
      if (weakSelf.giftSendViewScheduledTimer.isValid) {
  

            // 发送本地消息
            if([weakSelf giftSendViewSendLocalMsg:gift]) {

                [weakSelf.waittingSendGifts addObject:gift];// 增加等待发送礼物
            }

            [weakSelf giftSendViewScheduledTimerDestroy];// 发送礼物时间间隔定时器 destroy
        }
    }];
}

}

// 发送多个礼物

• (void)giftSendViewSendGifts {

  // 礼物数为0
  if (self.waittingSendGifts.count == 0) {

  return;

  }

  // 发送多个礼物
  __weak typeof(self) weakSelf = self;
  [_artistLiveDataController requestGiftsSendWithActivityId:self.activityId andGifts:self.waittingSendGifts andCallback:^(NSError error, NSArray<DNGift > *sendFailGifts) {

  if (error) {
  
      // 余额不足提示
      if (error.code == DNDataControlErrorUserRemainingMoneyNotEnough) {
  
          [weakSelf giftSendFailedViewAnimationShow];// 显示余额不足提示
          [self requestUserRemainingMoney];// 请求用户余额
      }
  
      // 其他错误处理
      if (error.code == DNDataControlErrorGiftSendFailed) {
  

        }

        // 把扣掉的余额加回来
        for (int i=0; i<sendFailGifts.count; i++) {

            DNGift *failureGift = [sendFailGifts objectAtIndex:i];
            weakSelf.giftSendView.remainMoney += failureGift.giftPrice.floatValue;// 减少余额
            NSLog(@"－－－－－－－－发送礼物[%@]失败！！！－－－－－－－－",failureGift.giftName);
        }
    } else {

        NSLog(@"－－－－－－－－发送礼物成功！！！－－－－－－－－");
    }

}];

// 清空等待发送的礼物
weakSelf.waittingSendGifts = [NSMutableArray arrayWithCapacity:0];

}

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利用Objective-C的methodSwizzing，替换sendAction:to:forEvent:方法，在替换的方法里面定义一个变量用来存储点击的时间。
可以参考：
http://www.jianshu.com/p/e4f1...

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你可以在点击按钮的时候开启一个定时器，判断时间间隔