如何获取 NSMutableArray 的 indexPath 值？

Question

我必须得到 NSMutableArray 的 IndexPath 值。当当时选择特定单元格时，我必须执行操作，它的 IndexPath 存储在 NSMutableArray 中并且特定单元格高度正在增加。当我在那个时候再次按下那个单元格时，特定的单元格高度正在减小。这怎么可能，我必须提出什么样的条件？

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSLog(@"%@",indexPath);
    selectIndexPathCell = indexPath;
    NSIndexPath *previousSelectedIndexPath = selectIndexPathCell;
    selectIndexPathCell = indexPath;

    if (previousSelectedIndexPath) {             
     [tableView reloadRowsAtIndexPaths:[NSArray arrayWithObject:previousSelectedIndexPath]
                                       withRowAnimation:UITableViewRowAnimationAutomatic];
    }
    [tableView reloadRowsAtIndexPaths:[NSArray arrayWithObject:selectIndexPathCell]
                 withRowAnimation:UITableViewRowAnimationAutomatic];

     self.selectedRow = sections_main[indexPath.section][@"content"][indexPath.row];
    [tblPeople beginUpdates];

    [tblPeople endUpdates];
}

- (CGFloat)tableView:(UITableView *)aTableView heightForRowAtIndexPath:(NSIndexPath *)indexPath 
{
    if(selectIndexPathCell != nil && [selectIndexPathCell compare:indexPath] == NSOrderedSame){
        return 80;
           }else{
               return 60.0;
}

}

Answer 1

据我了解，您需要基于标准的表格视图单元格高度。您可以通过将相应单元格的rowIndex 保存在array 中来管理它，并且通过使用reloadData 函数高度可以在heightForRowAtIndexPath 委托下进行管理，单元格高度将根据数组值进行更改。看看我的建议here。

希望对你有帮助！

编辑：（未经测试的版本给你一个想法）

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    if(![arrayOfExpandedCellIndexes containsObject:[NSNumber numberWithInteger:indexPath.row]])
    {
        [arrayOfExpandedCellIndexes addObject:[NSNumber numberWithInteger:indexPath.row]];  // add if it does not exist
    }
    else
    {
        [arrayOfExpandedCellIndexes removeObject:[NSNumber numberWithInteger:indexPath.row]];  // remove if it exists
    }

    [tableView reloadData];  // reload data so height would adjust in `heightForRowAtIndexPath`
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    if([arrayOfExpandedCellIndexes containsObject:[NSNumber numberWithInteger:indexPath.row]])    
         return EXTENDED_CELL_HEIGHT;   // Macro : #define EXTENDED_CELL_HEIGHT 230.0f 
    else 
         return NORMAL_CELL_HEIGHT;     // Macro : #define NORMAL_CELL_HEIGHT   100.0f 
}

假设arrayOfExpandedCellIndexes 是NSMutableArray 以维护索引。

Answer 2

Take a global variable ex: Int selectedIndex; and now in didselectrow write this 
-(void)viewDidLoad  
{  
[super viewDidLoad];  
selectedIndex=50; // please assign it as your arraycount+1; which you are using to display on tableview  
}  
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{

 if(selectedIndex==indexPath.row)
 {
   // if this is true you can do decrease your cell height
 selectedIndex=50; // please assign it as your arraycount+1;
 }
 else
 {
  // user can select one row and he can select another row without minimizing the previous one so you need to minimize the previous and increase new one. by using selectedIndex decrease cell height and by using indexPath.row increase height of cell
 selectedIndex=indexPath.row;

 }
[tableview reload];
 }
-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
 if(selectedIndex==indexPath.row)
{
  return 60;
}
else
{
 return 30;
}

}