ios UITableViewcell 设置复选标记但滚动时间复选标记是自动隐藏并尝试解决它崩溃

Question

我有一个表格 View 单元格，这是从一个数组绑定(bind)并选择多个单元格并设置为复选标记，但是当我滚动表格时，复选标记会自动隐藏然后我在 stackoverflow 上搜索，找到一个答案链接是 UITableview accessory type disappear while scrolling

我尝试了这段代码，但应用程序崩溃了这是我的代码，请帮助我

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

    static NSString *simpleTableIdentifier = @"FirstTableViewCell";

   FirstTableViewCell  *cell = (FirstTableViewCell *)[tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];
    if (cell == nil)
    {
        NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"FirstTableViewCell" owner:self options:nil];
        cell = [nib objectAtIndex:0];
    }
    if(tableView ==nurseTypeTable){
        cell.lbl1.text = [arrayNurseType objectAtIndex:indexPath.row];

        if(_nurseArray.count != nil){
      //  if (_nurseArray == nil || [_nurseArray count] == 0) {
        NSNumber *rowNsNum = [_nurseArray objectAtIndex:indexPath.row];
        if ( [arrayNurseType containsObject:rowNsNum]  )
        {
            cell.accessoryType = UITableViewCellAccessoryCheckmark;
        }
        else
        {
            cell.accessoryType = UITableViewCellAccessoryNone;
        }
        }

        return cell;
    }
}
    -(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    NSString * cellValue=nil;
    if (tableView==nurseTypeTable) {
        UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];

        //Here is for Check
        if(cell.accessoryType == UITableViewCellAccessoryNone) {
            cell.accessoryType = UITableViewCellAccessoryCheckmark;
            //here i add  in array
            cellValue=[arrayNurseType objectAtIndex:indexPath.row];
            NSLog(@"%@",cellValue);

            [_nurseArray addObject:cellValue];
            NSLog(@"%@",_nurseArray);

        }
        //Here is for uncheck
        else {
            cellValue=[arrayNurseType objectAtIndex:indexPath.row];
            [_nurseArray removeObject:cellValue];
            cell.accessoryType = UITableViewCellAccessoryNone;
            NSLog(@"Remove Array  %@",_nurseArray);
        }
        // [tableView deselectRowAtIndexPath:indexPath animated:YES];


    }

在函数cellForRowAtIndexPath **

NSNumber *rowNsNum = [_nurseArray objectAtIndex:indexPath.row];** is creash on debug time 
arrayNurseType = [NSMutableArray arrayWithObjects:@" Nurse ",@"One",nil]

Answer 1

你应该使用

     if(tableView ==nurseTypeTable){
        cell.lbl1.text = [arrayNurseType objectAtIndex:indexPath.row];

        if(_nurseArray.count != nil){
      //  if (_nurseArray == nil || [_nurseArray count] == 0) {
        if ( [_nurseArray containsObject:indexPath]  )
        {
            cell.accessoryType = UITableViewCellAccessoryCheckmark;
        }
        else
        {
            cell.accessoryType = UITableViewCellAccessoryNone;
        }
        }

        return cell;
    }
}