Question

滚动不堆积时如何在tableViewCell中创建数据？

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

    static NSString *theCell = @"Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:theCell];

    if (! cell) {

        cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:theCell];
    }

    UILabel *data1 = [self createLabelText:[NSString stringWithFormat:@"%@",[[arrayUtama objectAtIndex:indexPath.row]objectForKey:@"nomer"]]WithFrame:CGRectMake(10, 10, 150, 50) WithFont:[UIFont fontWithName:@"Arial" size:16] WithColor:[UIColor clearColor]];
    [cell insertSubview:data1 atIndex:0];

    UILabel *data2 = [self createLabelText:[NSString stringWithFormat:@"%@",[[arrayUtama objectAtIndex:indexPath.row]objectForKey:@"subjek"]]WithFrame:CGRectMake(50, 10, 150, 50) WithFont:[UIFont fontWithName:@"Arial" size:16] WithColor:[UIColor clearColor]];
    [cell insertSubview:data2 atIndex:1];

    UILabel *data3 = [self createLabelText:[NSString stringWithFormat:@"%@",[[arrayUtama objectAtIndex:indexPath.row]objectForKey:@"shadowScore"]]WithFrame:CGRectMake(200, 10, 150, 50) WithFont:[UIFont fontWithName:@"Arial" size:16] WithColor:[UIColor clearColor]];
    [cell insertSubview:data3 atIndex:2];

    UILabel *data4 = [self createLabelText:[NSString stringWithFormat:@"%@",[[arrayUtama objectAtIndex:indexPath.row]objectForKey:@"finalScore"]]WithFrame:CGRectMake(250, 10, 150, 50) WithFont:[UIFont fontWithName:@"Arial" size:16] WithColor:[UIColor clearColor]];
    [cell insertSubview:data4 atIndex:3];

    UILabel *data5 = [self createLabelText:[NSString stringWithFormat:@"%@",[[arrayUtama objectAtIndex:indexPath.row]objectForKey:@"kkm"]]WithFrame:CGRectMake(300, 10, 150, 50) WithFont:[UIFont fontWithName:@"Arial" size:16] WithColor:[UIColor clearColor]];
    [cell insertSubview:data5 atIndex:4];

    UILabel *data6 = [self createLabelText:[NSString stringWithFormat:@"%@",[[arrayUtama objectAtIndex:indexPath.row]objectForKey:@"Status"]]WithFrame:CGRectMake(350, 10, 150, 50) WithFont:[UIFont fontWithName:@"Arial" size:16] WithColor:[UIColor clearColor]];
    [cell insertSubview:data6 atIndex:5];

    UILabel *data7 = [self createLabelText:[NSString stringWithFormat:@"%@",[[arrayUtama objectAtIndex:indexPath.row]objectForKey:@"teachernote"]]WithFrame:CGRectMake(400, 10, 150, 50) WithFont:[UIFont fontWithName:@"Arial" size:16] WithColor:[UIColor clearColor]];
    [cell insertSubview:data7 atIndex:6];

    return cell;
}

Answer 1

问题是每次加载单元格时，您都要添加新的UILabel。当细胞被回收时，这就成了一个问题，因为它们已经创建了标签并且你正在创建更多的细胞。

您应该对UITableViewCell进行子类化，在加载时创建所需的UILabel和布局，然后只需在cellForRowAtIndexPath:方法中设置信息即可。这使您可以回收单元格并提高性能，同时保持布局并避免您发现的“堆叠问题”。

第二个选项

第二种，不太理想的选择是将UILabel创建方法移动到if (!cell)块并使用标记检索它们并将它们设置在该块之外。这样便携性更差，更脆弱，但重复使用标签的效果相同。它看起来像这样：

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

    static NSString *theCell = @"Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:theCell];

    if (! cell) {

        cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:theCell];

        UILabel *data1 = [self createLabelText:[NSString stringWithFormat:@"%@",[[arrayUtama objectAtIndex:indexPath.row]objectForKey:@"nomer"]]WithFrame:CGRectMake(10, 10, 150, 50) WithFont:[UIFont fontWithName:@"Arial" size:16] WithColor:[UIColor clearColor]];
        data1.tag = 1;
        [cell insertSubview:data1 atIndex:0];

        // ... Load Other labels and give unique tags

    }

    UILabel *data1 = [cell viewWithTag:1];
    data1 setText:[NSString stringWithFormat:@"%@",[[arrayUtama objectAtIndex:indexPath.row]objectForKey:@"nomer"]]];

    // ... Load other labels by tag and set text.

    return cell;
}

滚动时，tableview中的数据会堆积

1 个答案: