iOS tableViewCell 在cell赋值、网络加载照片位置偏移大小错乱，做一个类似qq列表的tableview 更新3

更新3: 问题 加载慢！
（一时间给的处理负载过大，要分散）在下载图片，判断状态后 对每个cell对图片灰置图片处理保存，影响了主线程的操作 
           ：上拉加载时，无法上下滑动tableview 无法点击cell
          ： 去除对每一个图片对灰置保存，只保存彩色，在需要灰色时在灰置，

    需求： 类似QQ列表的头像加载刷新，判断在线离线状态改变头像，以及彩色头像灰色处理，下载图片+获取在线状态需要连网--再改变头像
    问题：由于cell的复用以及下拉刷新数据每次加载10条数据，会出现头像赋值不正确，位置偏移大小不同的变化
    原因：由于cell的重复调用，加载数据方法已经赋值方法也在重复的调用，所以头像加载 在线状态判断好后，网络延迟，
         （个人开始yy：启动时的cell和赋值结束的cell可能不是同一个）
    修改：当cell开始调用的时候，给当前的cell赋tag值，加载结束判断是不是自己的tag：不是了跳过是了赋值。反正可以解决问题

    避免头像的重复加载，更换：由于每次进来都要重新加载一组新的头像，并没有做本地化处理；
    此处理会影响主线程操作：在控制器中添加一个可变的字典dict ； dict= {@"0":image,@"1":image,@"2":image,@"3":@"default",@"lasttime":@"0/1/2"}
         0是离线的image；1在线；2忙碌；3有值(使用默认头像，不存入字典)；lasttime 记录上一次的状态，刷新时首先显示上一次的状态值，刷新状态后：对比上一次，
         如果和上一次不一样了在更换；

//头像灰化处理

//置灰
+(UIImage*)createGrayCopy:(UIImage*)source{
    int width = source.size.width;
    int height = source.size.height;
    CGColorSpaceRef colorSpace =CGColorSpaceCreateDeviceGray();
    CGContextRef context =CGBitmapContextCreate(nil,
                                                width,
                                                height,
                                                ,// bits per component
                                                ,
                                                colorSpace,
                                                kCGBitmapByteOrderDefault);
    CGColorSpaceRelease(colorSpace);
    if(context ==NULL) {
        return nil;
    }
    CGContextDrawImage(context,
                       CGRectMake(,, width, height), source.CGImage);
    UIImage*grayImage = [UIImage imageWithCGImage:CGBitmapContextCreateImage(context)];
    CGContextRelease(context);
    return grayImage;
}

  //下载图片

//根据uid 取出相应的字典
NSMutableDictionary * dicc = arrayAllImage[model.uid];
//判断是否保存过图片
    if (dicc[@""]) {
        //之前保存过值
        cell.imageview.image = dicc[@""];

         if ([dicc[lasttime] isEqualToString:@""]) {
            cell.busyOr.hidden = NO;

         }else{
             cell.busyOr.hidden = YES;

         }

    }else{

//没有的话 下载  保存，设置在线状态 0离线灰色头像 1在线2忙碌彩色头像
        if ([model.status isEqualToString:@""]) {
            [cell.imageview sd_setImageWithURL:[NSURL URLWithString:model.headimage] placeholderImage:[UIImage imageNamed:HeadPortraitDoctor]];

            dicc =[NSMutableDictionary  dictionary];

            [dicc setObject:cell.imageview.image forKey:@""];

            [dicc setObject:@"" forKey:lasttime];
            [arrayAllImage setObject:dicc forKey:model.uid];

            cell.busyOr.hidden = YES;//隐藏 忙碌状态
        }
        else if([model.status isEqualToString:@""]){

            [cell.imageview sd_setImageWithURL:[NSURL URLWithString:model.headimage] placeholderImage:nil];
            //不在线
            cell.busyOr.hidden = YES;

            dicc =[NSMutableDictionary  dictionary];
            if (cell.imageview.image) {

               cell.imageview.image = [UIImage createGrayCopy:cell.imageview.image];
            }else{

                cell.imageview.image = graimage;
                [dicc setObject:graimage forKey:@""];
            }

            [dicc setObject:cell.imageview.image forKey:@""];
            [dicc setObject:@"" forKey:lasttime];
            [arrayAllImage setObject:dicc forKey:model.uid];

        }
        else if([model.status isEqualToString:@""]){
            //忙碌
            [cell.imageview sd_setImageWithURL:[NSURL URLWithString:model.headimage] placeholderImage:[UIImage imageNamed:HeadPortraitDoctor]];

            dicc =[NSMutableDictionary  dictionary];
            [dicc setObject:cell.imageview.image forKey:@""];
            [dicc setObject:@"" forKey:lasttime];
            [arrayAllImage setObject:dicc forKey:model.uid];
            cell.busyOr.hidden = NO;
        }

    }

    if(!ScrollerYesNo){
        //给图片标记
        cell.imageview.tag = indexPath.row+;

        [[GetUrlSession shareUrlconnection]connetion:[NSString stringWithFormat:@"%@?uid=%@&port=%@",searchOnlineStatusGet,model.uid,model.port] Haget:^(NSDictionary *data, NSError *error, NSHTTPURLResponse *response) {

            NSString* onlineStatue = [NSString stringWithFormat:@"%@",data[@"status"]];

            dispatch_async(dispatch_get_main_queue(), ^{

                NSMutableDictionary * diccc = [NSMutableDictionary dictionary];
                [diccc setDictionary: arrayAllImage[model.uid]];

                //判断当前的状态。  以及是否上一次的状态值
                if ([onlineStatue isEqualToString:@""] && ![onlineStatue isEqualToString:diccc[lasttime]]) {

                    UIImageView *lastImageView = [self.view viewWithTag:indexPath.row+];

                    if (![lastImageView isEqual:cell.imageview]) {

                        return ;
                    }

                    //在线
                    [cell.imageview sd_setImageWithURL:[NSURL URLWithString:model.headimage] placeholderImage:[UIImage imageNamed:HeadPortraitDoctor]];

                    [dicc setObject:cell.imageview.image forKey:@""];

                    [dicc setObject:@"" forKey:lasttime];
                    [arrayAllImage setObject:dicc forKey:model.uid];

                    cell.busyOr.hidden = YES;
                }else if([onlineStatue isEqualToString:@""]  && ![onlineStatue isEqualToString:diccc[lasttime]]){
                    //不在线
                    cell.busyOr.hidden = YES;

                    UIImageView *lastImageView = [self.view viewWithTag:indexPath.row+];

                    if (![lastImageView isEqual:cell.imageview]) {

                        return ;
                    }

                    [cell.imageview sd_setImageWithURL:[NSURL URLWithString:model.headimage] placeholderImage:nil];
                    if (cell.imageView.image) {
                        cell.imageview.image = [UIImage createGrayCopy:cell.imageview.image];
                    }else{
                    cell.imageview.image = graimage;
                    }
                    [dicc setObject:cell.imageview.image forKey:@""];
                    [dicc setObject:@"" forKey:lasttime];
                    [arrayAllImage setObject:dicc forKey:model.uid];

                }
                else if([onlineStatue isEqualToString:@""]  && ![onlineStatue isEqualToString:diccc[lasttime]]  ){
                    //忙碌

                    UIImageView *lastImageView = [self.view viewWithTag:indexPath.row+];

                    if (![lastImageView isEqual:cell.imageview]) {

                        return ;
                    }

                    //在线
                    [cell.imageview sd_setImageWithURL:[NSURL URLWithString:model.headimage] placeholderImage:[UIImage imageNamed:HeadPortraitDoctor]];
                    [dicc setObject:cell.imageview.image forKey:@""];
                    [dicc setObject:@"" forKey:lasttime];
                    [arrayAllImage setObject:dicc forKey:model.uid];
                    cell.busyOr.hidden = NO;
                }

            });

        }];

    }