Objective c 将一半以上的单元格移动到另一个分区时，Tableview崩溃

基本上，我正在尝试编写一个应用程序，它有一个包含两个部分的tableview，一个包含未完成的任务（单元格），另一个包含已完成的任务。每个单元格都有一个复选框UIButton子类。问题是，当我签出超过一半的项目时，它会因NSRangeException而崩溃。我非常感谢您对这个问题的任何建议

错误：*由于未捕获的异常“NSRangeException”而终止应用程序，原因：'*-[\uu NSArrayM objectAtIndex:]：索引9超出边界[0..8]'

CheckMarkTapped方法（调用以切换项目）：

CELLFORROWATINDEXPATH方法：

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

    static NSString *CellIdentifier = @"Cell";

    if (indexPath.section == 1) {
        CellIdentifier = @"Cell1";
    }

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
        cell.showsReorderControl = YES;
    }

    for (UIControl *checkbox in [cell subviews]) {
        if (checkbox.tag == 9001) {
            [checkbox removeFromSuperview];
        }
    }

    if (indexPath.section == 0) {
        UIButton *checkbox = [[UIButton alloc]initWithFrame:CGRectMake(5, 5, 40, 40)];
        [checkbox addTarget:self action:@selector(checkMarkTapped:) forControlEvents:UIControlEventTouchUpInside];
        [cell setIndentationWidth:45];
        [cell setIndentationLevel:1];

        [checkbox setTag:9001];
        [checkbox setImage:[UIImage imageNamed:@"unchecked"] forState:UIControlStateNormal];
        [checkbox setImage:[UIImage imageNamed:@"checked"] forState:UIControlStateSelected];

        [cell addSubview:checkbox];

        cell.textLabel.backgroundColor = [UIColor whiteColor];
        cell.textLabel.backgroundColor = [UIColor whiteColor];
        cell.contentView.backgroundColor = [UIColor whiteColor];
        cell.textLabel.font = [UIFont boldSystemFontOfSize:20];

        switch (indexPath.section) {
            case 0:
                cell.textLabel.text = [[uncompletedItems objectAtIndex:indexPath.row]objectForKey:@"Name"];
                break;
            case 1:
                cell.textLabel.text = [[completedItems objectAtIndex:indexPath.row]objectForKey:@"Name"];
                [checkbox setSelected:YES];
                break;
            default:
                break;
        }

        [cell addSubview:checkbox];

    } else if (indexPath.section == 1) {

        UIButton *checkbox = [[UIButton alloc]initWithFrame:CGRectMake(5, 5, 40, 40)];
        [checkbox addTarget:self action:@selector(checkMarkTapped:) forControlEvents:UIControlEventTouchUpInside];
        [cell setIndentationWidth:45];
        [cell setIndentationLevel:1];
        [checkbox setTag:9001];

        cell.textLabel.backgroundColor = [UIColor whiteColor];
        cell.textLabel.backgroundColor = [UIColor whiteColor];
        cell.contentView.backgroundColor = [UIColor whiteColor];
        cell.textLabel.font = [UIFont boldSystemFontOfSize:20];
        cell.textLabel.text = [[uncompletedItems objectAtIndex:indexPath.row]objectForKey:@"Name"];

        [checkbox setImage:[UIImage imageNamed:@"unchecked"] forState:UIControlStateNormal];
        [checkbox setImage:[UIImage imageNamed:@"checked"] forState:UIControlStateSelected];

        [cell addSubview:checkbox];

        switch (indexPath.section) {
            case 0:
                cell.textLabel.text = [[uncompletedItems objectAtIndex:indexPath.row]objectForKey:@"Name"];
                break;
            case 1:
                cell.textLabel.text = [[completedItems objectAtIndex:indexPath.row]objectForKey:@"Name"];
                [checkbox setSelected:YES];
                break;
            default:
                break;
        }

        [cell addSubview:checkbox];
    }
    return cell;
}

这是坠机事件的NSLog。如您所见，当数组具有相等数量的项时会发生这种情况：

2012-12-26 12:54:44.583 Checklist R4[1128:c07] Destination Row: 0, UnCompleted Count: 19, Completed Count: 1
2012-12-26 12:54:45.034 Checklist R4[1128:c07] Destination Row: 1, UnCompleted Count: 18, Completed Count: 2
2012-12-26 12:54:45.454 Checklist R4[1128:c07] Destination Row: 2, UnCompleted Count: 17, Completed Count: 3
2012-12-26 12:54:45.873 Checklist R4[1128:c07] Destination Row: 3, UnCompleted Count: 16, Completed Count: 4
2012-12-26 12:54:46.294 Checklist R4[1128:c07] Destination Row: 4, UnCompleted Count: 15, Completed Count: 5
2012-12-26 12:54:47.072 Checklist R4[1128:c07] Destination Row: 5, UnCompleted Count: 14, Completed Count: 6
2012-12-26 12:54:47.399 Checklist R4[1128:c07] Destination Row: 6, UnCompleted Count: 13, Completed Count: 7
2012-12-26 12:54:48.085 Checklist R4[1128:c07] Destination Row: 7, UnCompleted Count: 12, Completed Count: 8
2012-12-26 12:54:48.621 Checklist R4[1128:c07] Destination Row: 8, UnCompleted Count: 11, Completed Count: 9
2012-12-26 12:54:49.090 Checklist R4[1128:c07] Destination Row: 9, UnCompleted Count: 10, Completed Count: 10
2012-12-26 12:54:50.234 Checklist R4[1128:c07] *** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayM objectAtIndex:]: index 9 beyond bounds [0 .. 8]'

---

您的

completedItems

或

uncompletedItems

数组，其中一个只有8个项目，但您尝试访问的项目不止这些。检查

numberOfRowsInSection

方法，给出它们的动态值，如

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    int rowCount = 0;
    if (section == 0) {
        rowCount = [uncompletedItems count];
    } else {
        rowCount = [completedItems count];
    }
    return rowCount;
}

而且它不需要同时使用

开关

和

if

。请使用任何人检查您的

部分

是否为0或1

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

static NSString *CellIdentifier = @"Cell";

if (indexPath.section == 1) {
    CellIdentifier = @"Cell1";
}

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

if (cell == nil) {
    cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    cell.showsReorderControl = YES;
}

for (UIControl *checkbox in [cell subviews]) {
    if (checkbox.tag == 9001) {
        [checkbox removeFromSuperview];
    }
}

    UIButton *checkbox = [[UIButton alloc]initWithFrame:CGRectMake(5, 5, 40, 40)];
    [checkbox addTarget:self action:@selector(checkMarkTapped:) forControlEvents:UIControlEventTouchUpInside];
    [cell setIndentationWidth:45];
    [cell setIndentationLevel:1];

    [checkbox setTag:9001];
    [checkbox setImage:[UIImage imageNamed:@"unchecked"] forState:UIControlStateNormal];
    [checkbox setImage:[UIImage imageNamed:@"checked"] forState:UIControlStateSelected];

    [cell addSubview:checkbox];

    cell.textLabel.backgroundColor = [UIColor whiteColor];
    cell.textLabel.backgroundColor = [UIColor whiteColor];
    cell.contentView.backgroundColor = [UIColor whiteColor];
    cell.textLabel.font = [UIFont boldSystemFontOfSize:20];

    switch (indexPath.section) {
        case 0:
            cell.textLabel.text = [[uncompletedItems objectAtIndex:indexPath.row]objectForKey:@"Name"];
            break;
        case 1:
            cell.textLabel.text = [[completedItems objectAtIndex:indexPath.row]objectForKey:@"Name"];
            [checkbox setSelected:YES];
            break;
        default:
            break;
    }

    [cell addSubview:checkbox];

return cell;
}

---

您的代码中可能有两个问题

返回到表视图的行数小于数组的行数
计数。

您的数组超出了表中的行数
查看。

---

您描述的

错误

清楚地表明您的数组有

8个

索引，但您正在访问导致错误的

9个

索引。

两件事：首先显示或说明返回了多少行/节，其次说明在哪一行代码中获得异常（如果您不知道，请添加异常断点）.我知道是什么原因导致了错误，但我无法理解它为什么访问不存在的第九个索引。另外，奇怪的是，只有当两个部分中的项相等时才会发生这种情况。好吧，一个快速的解决方案是，我们可以进行检查，只有当

索引

小于

数组计数

时，才在tableView中插入数据。它不起作用。它以前崩溃过。我编辑了这篇文章以包含它崩溃的点。我检查了cellForRowAtIndexPath方法，发现它没有问题。还有其他想法吗？通过设置来尝试。我找不到你的代码中有什么问题。因为在按钮操作中，有时添加，有时插入<代码>符号断点将使您知道代码崩溃的位置。

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

static NSString *CellIdentifier = @"Cell";

if (indexPath.section == 1) {
    CellIdentifier = @"Cell1";
}

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

if (cell == nil) {
    cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    cell.showsReorderControl = YES;
}

for (UIControl *checkbox in [cell subviews]) {
    if (checkbox.tag == 9001) {
        [checkbox removeFromSuperview];
    }
}

    UIButton *checkbox = [[UIButton alloc]initWithFrame:CGRectMake(5, 5, 40, 40)];
    [checkbox addTarget:self action:@selector(checkMarkTapped:) forControlEvents:UIControlEventTouchUpInside];
    [cell setIndentationWidth:45];
    [cell setIndentationLevel:1];

    [checkbox setTag:9001];
    [checkbox setImage:[UIImage imageNamed:@"unchecked"] forState:UIControlStateNormal];
    [checkbox setImage:[UIImage imageNamed:@"checked"] forState:UIControlStateSelected];

    [cell addSubview:checkbox];

    cell.textLabel.backgroundColor = [UIColor whiteColor];
    cell.textLabel.backgroundColor = [UIColor whiteColor];
    cell.contentView.backgroundColor = [UIColor whiteColor];
    cell.textLabel.font = [UIFont boldSystemFontOfSize:20];

    switch (indexPath.section) {
        case 0:
            cell.textLabel.text = [[uncompletedItems objectAtIndex:indexPath.row]objectForKey:@"Name"];
            break;
        case 1:
            cell.textLabel.text = [[completedItems objectAtIndex:indexPath.row]objectForKey:@"Name"];
            [checkbox setSelected:YES];
            break;
        default:
            break;
    }

    [cell addSubview:checkbox];

return cell;
}