重新加载tableview数据重复

Question

我在uitableviewcell内的标签文字上使用了NSTimer。这个标签文本每5秒更新一次，我每5秒钟调用一次[重新加载theTableView];而不是更新它似乎重复而不是覆盖如何来：

以下是重新加载数据时的图像：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath

{



chatCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell"];
if (cell == nil) cell = [[chatCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:@"cell"];
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;




cell.backgroundColor = [UIColor colorWithRed:243/255.0f green:243/255.0f blue:247/255.0f alpha:1.0f];
    cell.homeTeamLabel = [[UILabel alloc] initWithFrame:CGRectMake(80, 10, 140, 20)];
    cell.homeTeamLabel.text = [[arrayBarclay objectAtIndex:indexPath.row] objectForKey:@"hometeam" ];
    cell.homeTeamLabel.font = [UIFont systemFontOfSize:14.0];
    cell.homeTeamLabel.textColor = [UIColor blackColor];
    [cell.contentView addSubview:cell.homeTeamLabel];

    cell.awayTeamLabel = [[UILabel alloc] initWithFrame:CGRectMake(80, 30, 140, 20)];
    cell.awayTeamLabel.text = [[arrayBarclay objectAtIndex:indexPath.row] objectForKey:@"awayteam" ];
    cell.awayTeamLabel.font = [UIFont systemFontOfSize:14.0];
    cell.awayTeamLabel.textColor = [UIColor blackColor];
    [cell.contentView addSubview:cell.awayTeamLabel];


    cell.homeTeamScore = [[UILabel alloc] initWithFrame:CGRectMake(cell.frame.size.width-50, 10, 30, 20)];
    cell.homeTeamScore.text = [[arrayBarclay objectAtIndex:indexPath.row] objectForKey:@"homescore" ];
    cell.homeTeamScore.font = [UIFont systemFontOfSize:14.0];
    cell.homeTeamScore.textColor = [UIColor blackColor];
    [cell.contentView addSubview:cell.homeTeamScore];

    cell.awayTeamScore = [[UILabel alloc] initWithFrame:CGRectMake(cell.frame.size.width-50, 30, 30, 20)];
    cell.awayTeamScore.text = [[arrayBarclay objectAtIndex:indexPath.row] objectForKey:@"awayscore" ];
    cell.awayTeamScore.font = [UIFont systemFontOfSize:14.0];
    cell.awayTeamScore.textColor = [UIColor blackColor];
    [cell.contentView addSubview:cell.awayTeamScore];


    cell.time = [[UILabel alloc] initWithFrame:CGRectMake(10, 0, 40, 60)];
    cell.time.textAlignment = NSTextAlignmentCenter;
    cell.time.text = [[arrayBarclay objectAtIndex:indexPath.row] objectForKey:@"time" ];
    cell.time.font = [UIFont systemFontOfSize:14.0];
    cell.time.textColor = [UIColor blackColor];
    [cell.contentView addSubview:cell.time];

}

Answer 1

不要在cellForRowAtIndexPath中使用[cell addSubview:yourView];，它会继续在您的单元格上添加子视图，无论它是否存在。子类UITableViewCell并分配所有视图并在初始化中添加它们，然后引用这些属性并在NSTimer调用的方法中更新它们的方式。

Answer 2

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
     chatCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell"];
     if (cell == nil){
        cell = [[chatCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:@"cell"];

        //It's better to move following code to chatCell
        //And ChatCell className will also be better.
        cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;

        cell.backgroundColor = [UIColor colorWithRed:243/255.0f green:243/255.0f blue:247/255.0f alpha:1.0f];
        cell.homeTeamLabel = [[UILabel alloc] initWithFrame:CGRectMake(80, 10, 140, 20)];
        cell.homeTeamLabel.font = [UIFont systemFontOfSize:14.0];
        cell.homeTeamLabel.textColor = [UIColor blackColor];
        [cell.contentView addSubview:cell.homeTeamLabel];

        cell.awayTeamLabel = [[UILabel alloc] initWithFrame:CGRectMake(80, 30, 140, 20)];
        cell.awayTeamLabel.font = [UIFont systemFontOfSize:14.0];
        cell.awayTeamLabel.textColor = [UIColor blackColor];
        [cell.contentView addSubview:cell.awayTeamLabel];

        cell.homeTeamScore = [[UILabel alloc] initWithFrame:CGRectMake(cell.frame.size.width-50, 10, 30, 20)];

        cell.homeTeamScore.font = [UIFont systemFontOfSize:14.0];
        cell.homeTeamScore.textColor = [UIColor blackColor]
        [cell.contentView addSubview:cell.homeTeamScore];

        cell.awayTeamScore = [[UILabel alloc] initWithFrame:CGRectMake(cell.frame.size.width-50, 30, 30, 20)];
        cell.awayTeamScore.font = [UIFont systemFontOfSize:14.0];
        cell.awayTeamScore.textColor = [UIColor blackColor];
        [cell.contentView addSubview:cell.awayTeamScore];

        cell.time = [[UILabel alloc] initWithFrame:CGRectMake(10, 0, 40, 60)];
        cell.time.textAlignment = NSTextAlignmentCenter;
        cell.time.font = [UIFont systemFontOfSize:14.0];
        cell.time.textColor = [UIColor blackColor];
        [cell.contentView addSubview:cell.time];
     }  

     //Move [arrayBarclay objectAtIndex:indexPath.row] out  will be better.
     NSDictionnary *contentDict = [arrayBarclay objectAtIndex:indexPath.row];
     cell.homeTeamLabel.text = [contentDict objectForKey:@"hometeam"];
     cell.awayTeamLabel.text = [contentDict objectForKey:@"awayteam"];
     cell.homeTeamScore.text = [contentDict objectForKey:@"homescore" ];
     cell.awayTeamScore.text = [contentDict objectForKey:@"awayscore" ];
     cell.time.text = [contentDict objectForKey:@"time" ];

     return cell;
}

如果要重用单元格，最好在其init方法中初始化其子视图。只要显示单元格，就会调用cellForRowAtIndexPath:。如果您需要动态addsubview，请先删除以前添加的视图。