使用调度队列在uitableview中进行平滑滚动，在数组中提供随机值

Question

我在墙上显示帖子等不喜欢按钮，这些按钮必须显示喜欢和不喜欢的数量。帖子的数据来自不同的API。但喜欢和不喜欢的价值来自不同的API。对于每个帖子的喜欢不喜欢有一个id，它被送到API然后点击。因此，对于每个帖子，该API被命中意味着等于单元格的数量。所以我使用了调度队列但是它在数组中显示了混洗值，并且没有调度队列，它给出了正确的值，但是在滚动时表被暂停并且非常慢。如何解决这个问题，请指导。

这是代码。

-(UITableViewCell *) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"Cell";

Cell *cell = (Cell*)[self.mPublicFriendTable dequeueReusableCellWithIdentifier:nil];
if (cell == nil) {
    cell = [[Cell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
else{
    cell = [[Cell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}

cell.contentView.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"text_boxbg.png"]];

cell.selectionStyle = UITableViewCellSelectionStyleNone;
cell.mLblName.frame = CGRectMake(50, 9, 150, 18);
cell.mLblTxt.frame = CGRectMake(50, 26, 218, 29);

if (indexPath.section == [self.mArrLike count])
{
     cell.textLabel.text = @"Load More...";
} else
{
strLk = [self.mArrLike objectAtIndex:indexPath.section];
strDLk = [self.mArrDislike objectAtIndex:indexPath.section];

   // NSLog(@"mARRUname:%d", [self.mArrUName count]);
cell.mLblName.text = [self.mArrUName objectAtIndex:indexPath.section];
CGSize size = [cell.mLblName.text sizeWithFont:[UIFont boldSystemFontOfSize:20.0]];
cell.mLblImg.frame = CGRectMake(size.width+20,14, 9, 14);

NSString *imageUrlString = [self.mArrProfileImg objectAtIndex:indexPath.section];
NSLog(@"counter at:%d",indexPath.section);
asyncImageView = [[AsyncImageView alloc]initWithFrame:CGRectMake(9, 9, 37, 37)];
[asyncImageView loadImageFromURL:[NSURL URLWithString:imageUrlString]];
[cell.contentView addSubview:asyncImageView];

cell.mLblTxt.text = [self.mArrText objectAtIndex:indexPath.section];
cell.mLblDate.text = [self.mArrDate objectAtIndex:indexPath.section];
cell.mLblTimeImg.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"message.png"]];
cell.mLblDate.textColor = [UIColor colorWithRed:109.0/255.0 green:218.0/255.0 blue:250.0/255.0 alpha:1.0];

[cell.mBtnLike setImage:[UIImage imageNamed:@"thumb_up.png"] forState:UIControlStateNormal];
    [cell.mBtnLike addTarget:self action:@selector(like:) forControlEvents:UIControlEventTouchUpInside];
//[cell.mBtnLike setBackgroundColor:[UIColor colorWithRed:47.0/255.0 green:200.0/255.0 blue:247.0/255.0 alpha:1.0]];
[cell.mBtnLike setTitleEdgeInsets:UIEdgeInsetsMake(0, 0, 0, -10)];
cell.mBtnLike.imageEdgeInsets = UIEdgeInsetsMake(0, -10, 0, 0);
[cell.mBtnLike setTitle:strLk forState:UIControlStateNormal];

[cell.mBtnDislike setImage:[UIImage imageNamed:@"thumb_down.png"] forState:UIControlStateNormal];
[cell.mBtnDislike addTarget:self action:@selector(dislike) forControlEvents:UIControlEventTouchUpInside];
 //[cell.mBtnDislike setBackgroundColor:[UIColor colorWithRed:47.0/255.0 green:200.0/255.0 blue:247.0/255.0 alpha:1.0]];
[cell.mBtnDislike setTitleEdgeInsets:UIEdgeInsetsMake(0, 0, 0, -10)];
cell.mBtnDislike.imageEdgeInsets = UIEdgeInsetsMake(0, -15, 0, 0);
[cell.mBtnDislike setTitle:strDLk forState:UIControlStateNormal];

[cell.mBtnShare setImage:[UIImage imageNamed:@"back_icon.png"] forState:UIControlStateNormal];
[cell.mBtnShare addTarget:self action:@selector(share) forControlEvents:UIControlEventTouchUpInside];
 //[cell.mBtnShare setBackgroundColor:[UIColor colorWithRed:47.0/255.0 green:200.0/255.0 blue:247.0/255.0 alpha:1.0]];
cell.mBtnShare.imageEdgeInsets = UIEdgeInsetsMake(0, 0, 0, -35);
[cell.mBtnShare setTitleEdgeInsets:UIEdgeInsetsMake(0, -50, 0, 0)];
[cell.mBtnShare setTitle:@"" forState:UIControlStateNormal];

[cell.mBtnComm setImage:[UIImage imageNamed:@"chat_icon.png"] forState:UIControlStateNormal];
[cell.mBtnComm addTarget:self action:@selector(comments) forControlEvents:UIControlEventTouchUpInside];
//[cell.mBtnComm setBackgroundColor:[UIColor colorWithRed:47.0/255.0 green:200.0/255.0 blue:247.0/255.0 alpha:1.0]];
[cell.mBtnComm setTitleEdgeInsets:UIEdgeInsetsMake(0, -52, 0, 0)];
cell.mBtnComm.imageEdgeInsets = UIEdgeInsetsMake(0, 0, 0, -50);
[cell.mBtnComm setTitle:@"30" forState:UIControlStateNormal];
}
return cell;
}

- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath
{
  NSLog(@"count like:%d", [self.mArrLike count]);
NSLog(@"count uname:%d", [self.mArrUName count]);
if(indexPath.section == ([self.mArrLike count]-1))
{
[self loadData:indexPath.section];
}
}

-(void)loadData:(int)indexVal;
{
status = [NSString stringWithFormat:@"get"];
[self.mButtonsStatusDict setObject:status forKey:@"status"];

[self.mButtonsPidDict setObject:[self.mArrPid objectAtIndex:indexVal] forKey:@"pid"];

dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0ul);

dispatch_async(queue, ^{

    self.mButtonsDict = [MyEventApi likeDislike:self.mButtonsUidDict post:self.mButtonsPidDict postStatus:self.mButtonsStatusDict];
    NSLog(@"buttons data dict:%@", self.mButtonsDict);


    dispatch_sync(dispatch_get_main_queue(), ^{

        [self.mArrLike addObject: [self.mButtonsDict valueForKey:@"like"]];
        [self.mArrDislike addObject: [self.mButtonsDict valueForKey:@"dislike"]];

        NSLog(@"arrLike count:%d", [self.mArrLike count]);
       // strLk = [self.mArrLike objectAtIndex:indexPath.section];
       // strDLk = [self.mArrDislike objectAtIndex:indexPath.section];

        [self.mPublicFriendTable reloadData];
    });
});
}

尝试使用调度队列和异步json，但没有得到正确的结果。 请提前指导以上感谢。

Answer 1

-Declare .h文件中的变量int serialIndexVal;

- 维护一个serialIndexVal，它将跟踪indexVal ...

serialIndexVal++; 
indexVal=serialIndexVal; 

将以下代码放在GCD块

中

__block NSString *status = [NSString stringWithFormat:@"get"];
 [self.mButtonsStatusDict setObject:status forKey:@"status"]; 
[self.mButtonsPidDict setObject:[self.mArrPid objectAtIndex:indexVal] forKey:@"pid"];

- 在viewWillDisappear上制作你的serialIndexVal=0;再次。