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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伊谢尔伦2017-04-18 09:31:08 2楼

// 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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