使用UITableView indexPath访问NSMutableArrays的多维NSMutableArray

我有一个dynamic的部分和行的UITableView ，我想要使用自定义cell.accessoryView ，我已经设法使用下面的代码创build。

 - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { [stackRotationController pop]; cell = (TreeCell *)[cuttingTableView cellForRowAtIndexPath:indexPath]; UIImageView *checkmark = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"[e-mail]"]]; 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:@"[e-mail]"]]; if ([[selectedStatesMArray objectAtIndex:indexPath.row] boolValue] == NO) { cell.accessoryView = UITableViewCellAccessoryNone; } else { cell.accessoryView = checkmark; } cell.itemsDictionary = cellDictionary; cellDictionary = nil; [cell drawCell]; return cell; } 

问题是这样的，它添加了一个刻度到每一个有行剔的部分…这是不是我想要的，所以我改变了上面的代码工作NSMutableArray的NSMutableArrays 。

但是现在我得到一个错误

 - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { [stackRotationController pop]; cell = (TreeCell *)[cuttingTableView cellForRowAtIndexPath:indexPath]; UIImageView *checkmark = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"[e-mail]"]]; 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:@"[e-mail]"]]; 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; } 

当我去显示第一个单元格的应用程序时，会出现以下错误

 Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayM objectAtIndex:]: index 0 beyond bounds for empty array' 

我从我的parsing器委托获取值selectedStatesMArray像这样。 这个代码在cellForRow代码被调用之前调用，所以它应该工作，但不是。

 NSNumber *newState; newState = [NSNumber numberWithBool:NO]; NSMutableArray *tempSelectedStatesMArray = [[NSMutableArray alloc] init]; for (int i = 0; i < [sortedDictionaryArraysForTableView count]; i++) { NSMutableArray *tempSectionSelectedStatsMArray = [[NSMutableArray alloc] init]; for (int j = 0; j < [[sortedDictionaryArraysForTableView objectForKey:[NSString stringWithFormat:@"%d",i]] count]; j++) { [tempSectionSelectedStatsMArray addObject:newState]; } [tempSelectedStatesMArray addObject:tempSectionSelectedStatsMArray]; } selectedStatesMArray = [tempSelectedStatesMArray mutableCopy]; 

任何帮助，将不胜感激。

Answer 1

你的问题是你有一个空数组，而不是尝试和解读你的代码，我build议你使用一个NSMutableIndexSet的数组。 这会让你的生活变得更轻松。

我们从初始化方法开始。 您应该在完成加载数据之后，在调用tableview上的reloadData之前立即调用它。

 @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，你的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:@"[e-mail]"]]; } //.... } 

和你的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:@"[e-mail]"]]; } else { cell.accessoryView=nil; } cell.itemsDictionary = (NSDictionary *)[currentArray objectAtIndex:indexPath.row]; [cell drawCell]; return cell; }