Question

我有一个动态数量的部分和行的UITableView，我想使用我设法使用以下代码创建的自定义cell.accessoryView。

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    [stackRotationController pop];
    cell = (TreeCell *)[cuttingTableView cellForRowAtIndexPath:indexPath];

    UIImageView *checkmark = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"findbitting@2x.png"]];
    NSNumber *newState;

    if ([[selectedStatesMArray objectAtIndex:indexPath.row] boolValue] == NO) {
        newState = [NSNumber numberWithBool:YES];
        cell.accessoryView = checkmark;
    } else {
        newState = [NSNumber numberWithBool:NO];
        cell.accessoryView = UITableViewCellAccessoryNone;
    }
    [selectedStatesMArray replaceObjectAtIndex:indexPath.row withObject:newState];

    //....
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSString *currentNumber = [uniqueKeys objectAtIndex:indexPath.section];
    NSMutableArray *currentArray = [sortedDictionaryArraysForTableView objectForKey:currentNumber];
    cellDictionary = [currentArray objectAtIndex:indexPath.row];

    static NSString *CellIdentifier = @"Cell";

    cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[TreeCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
        cell.selectionStyle = UITableViewCellSelectionStyleNone;
    }

    // Configure the cell.
//    cell.selectionStyle = UITableViewCellSelectionStyleNone;
    UIImageView *checkmark = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"findbitting@2x.png"]];

    if ([[selectedStatesMArray objectAtIndex:indexPath.row] boolValue] == NO) {
        cell.accessoryView = UITableViewCellAccessoryNone;
    } else {
        cell.accessoryView = checkmark;
    }


    cell.itemsDictionary = cellDictionary;
    cellDictionary = nil;
    [cell drawCell];

    return cell;
}

问题在于，它为每个有行标记的部分添加了一个勾号...这不是我想要的，所以我更改了上面的代码来处理NSMutableArray {{1} }}

但现在我收到错误

NSMutableArrays

当我去显示第一个单元格时，应用程序会出现以下错误

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    [stackRotationController pop];
    cell = (TreeCell *)[cuttingTableView cellForRowAtIndexPath:indexPath];

    UIImageView *checkmark = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"findbitting@2x.png"]];
    NSNumber *newState;



    NSMutableArray *tempInternalMArray = [selectedStatesMArray objectAtIndex:indexPath.section];

    if ([[tempInternalMArray objectAtIndex:indexPath.row] boolValue] == NO) {
        newState = [NSNumber numberWithBool:YES];
        cell.accessoryView = checkmark;
    } else {
        newState = [NSNumber numberWithBool:NO];
        cell.accessoryView = UITableViewCellAccessoryNone;
    }
    [tempInternalMArray replaceObjectAtIndex:indexPath.row withObject:newState];
    [selectedStatesMArray replaceObjectAtIndex:indexPath.section withObject:tempInternalMArray];

    //....
}


- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSString *currentNumber = [uniqueKeys objectAtIndex:indexPath.section];
    NSMutableArray *currentArray = [sortedDictionaryArraysForTableView objectForKey:currentNumber];
    cellDictionary = [currentArray objectAtIndex:indexPath.row];

    static NSString *CellIdentifier = @"Cell";

    cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[TreeCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
        cell.selectionStyle = UITableViewCellSelectionStyleNone;
    }

    // Configure the cell.
    // cell.selectionStyle = UITableViewCellSelectionStyleNone;
    UIImageView *checkmark = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"findbitting@2x.png"]];

    NSMutableArray *tempInternalMArray = [[selectedStatesMArray objectAtIndex:indexPath.section] mutableCopy];

    if ([[tempInternalMArray objectAtIndex:indexPath.row] boolValue] == NO) { // error happens here
        cell.accessoryView = UITableViewCellAccessoryNone;
    } else {
        cell.accessoryView = checkmark;
    }


    cell.itemsDictionary = cellDictionary;
    cellDictionary = nil;
    [cell drawCell];

    return cell;
}

我从我的解析器委托中获取值Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayM objectAtIndex:]: index 0 beyond bounds for empty array'。在调用selectedStatesMArray代码之前调用此代码，因此它应该正常工作但不是。

cellForRow

Answer 1

你的问题是你有一个空数组但不是尝试解密你的代码，我建议你使用NSMutableIndexSet数组。它会让你的生活更轻松。

让我们从初始化方法开始。您应该在完成加载数据之后但在对tableview上的reloadData进行任何调用之前立即调用此方法。

@property (nonatomic,strong) NSMutableArray *selectStates;

-(void) initialiseSelectStates {
   self.selectedStates=[NSMutableArray new];
   for (int i=0;i<uniqueKeys.count;i++) {
       [self.selectedStates addObject:[NSMutableIndexSet new]];
   }
}

现在，您的didSelectRowAtIndexPath将是 -

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    [stackRotationController pop];
    cell = (TreeCell *)[cuttingTableView cellForRowAtIndexPath:indexPath];

    NSMutableIndexSet *sectionSelects=[self.selectedStats objectAtIndex:indexPath.section];

    if ([sectionSelects containsIndex:indexPath.row]) {
       [selectionSelects removeIndex:indexPath.row];
       cell.accessoryView=nil;
    }
    else {
       [selectionSelects addIndex:indexPath.row];
       cell.accessoryView=[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"findbitting@2x.png"]];
    }
    //....
}

您的cellForRowAtIndexPath:将

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSString *currentNumber = [uniqueKeys objectAtIndex:indexPath.section];
    NSMutableArray *currentArray = [sortedDictionaryArraysForTableView objectForKey:currentNumber];
    NSMutableIndexSet *sectionSelects=[self.selectedStats objectAtIndex:indexPath.section];

    static NSString *CellIdentifier = @"Cell";

    cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[TreeCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
        cell.selectionStyle = UITableViewCellSelectionStyleNone;
    }

    // Configure the cell.
    // cell.selectionStyle = UITableViewCellSelectionStyleNone;

    if ([sectionSelects containsIndex:indexPath.row]) { 
       cell.accessoryView=[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"findbitting@2x.png"]];
    }
    else {
       cell.accessoryView=nil;
    }

    cell.itemsDictionary = (NSDictionary *)[currentArray objectAtIndex:indexPath.row];
    [cell drawCell];

    return cell;
}

使用UITableView indexPath访问NSMutableArrays的多维NSMutableArray

1 个答案: