扩展折叠 UITableViewCells

在 Storyboard 中，在 UIViewController 上添加一个 UITableView 对象，让它覆盖整个视图。设置 UITableviewDataSource 和 UITableviewDelegate 连接。

Objective-C

在你的 .h 文件中

NSMutableArray *arrayForBool;
NSMutableArray *sectionTitleArray;

在你的 .m 文件中

- (void)viewDidLoad  {
    [super viewDidLoad];

    arrayForBool = [[NSMutableArray alloc] init];
    sectionTitleArray = @[@"Sam",@"Sanju",@"John",@"Staffy"];
           
    for (int i=0; i<[sectionTitleArray count]; i++) {
        [arrayForBool addObject:[NSNumber numberWithBool:NO]];
    }

    _tableView.dataSource = self;
    _tableView.delegate = self;
}  

 // Declare number of rows in section
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
     if ([[arrayForBool objectAtIndex:section] boolValue]) {
         return section+2;
    } else {
         return 0; 
    }
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
 
static NSString *cellid=@"hello";
UITableViewCell *cell=[tableView dequeueReusableCellWithIdentifier:cellid];
if (cell==nil) {
    cell=[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:cellid];
}
   BOOL manyCells  = [[arrayForBool objectAtIndex:indexPath.section] boolValue];

         /** If the section supposed to be closed******/
    if(!manyCells){
        cell.backgroundColor=[UIColor clearColor];   
        cell.textLabel.text=@"";
    }
      /** If the section supposed to be Opened******/
    else{
        cell.textLabel.text=[NSString stringWithFormat:@"%@ %d",[sectionTitleArray objectAtIndex:indexPath.section],indexPath.row+1];
        cell.backgroundColor=[UIColor whiteColor];
        cell.selectionStyle=UITableViewCellSelectionStyleNone ;
    }
cell.textLabel.textColor=[UIColor blackColor];

 /** Add a custom Separator with cell*/
  UIView* separatorLineView = [[UIView alloc]initWithFrame:CGRectMake(15, 40, _expandableTableView.frame.size.width-15, 1)];
separatorLineView.backgroundColor = [UIColor blackColor];
[cell.contentView addSubview:separatorLineView];
return cell;
}

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return [sectionTitleArray count];
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath  *)indexPath
{

/*************** Close the section, once the data is selected ***********************************/
[arrayForBool replaceObjectAtIndex:indexPath.section withObject:[NSNumber numberWithBool:NO]];

 [_expandableTableView reloadSections:[NSIndexSet indexSetWithIndex:indexPath.section] withRowAnimation:UITableViewRowAnimationAutomatic];

 }

 - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
if ([[arrayForBool objectAtIndex:indexPath.section] boolValue]) {
    return 40;
}
return 0;

   }

- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{

UIView *sectionView=[[UIView alloc]initWithFrame:CGRectMake(0, 0, 280,40)];
sectionView.tag=section;
UILabel *viewLabel=[[UILabel alloc]initWithFrame:CGRectMake(10, 0, _expandableTableView.frame.size.width-10, 40)];
viewLabel.backgroundColor=[UIColor clearColor];
viewLabel.textColor=[UIColor blackColor];
viewLabel.font=[UIFont systemFontOfSize:15];
viewLabel.text=[NSString stringWithFormat:@"List of %@",[sectionTitleArray objectAtIndex:section]];
[sectionView addSubview:viewLabel];
         /********** Add a custom Separator with Section view *******************/
UIView* separatorLineView = [[UIView alloc] initWithFrame:CGRectMake(15, 40, _expandableTableView.frame.size.width-15, 1)];
separatorLineView.backgroundColor = [UIColor blackColor];
[sectionView addSubview:separatorLineView];

/********** Add UITapGestureRecognizer to SectionView   **************/

UITapGestureRecognizer  *headerTapped   = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(sectionHeaderTapped:)];
[sectionView addGestureRecognizer:headerTapped];

return  sectionView;

}

- (void)sectionHeaderTapped:(UITapGestureRecognizer *)gestureRecognizer{

NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:gestureRecognizer.view.tag];
if (indexPath.row == 0) {
    BOOL collapsed  = [[arrayForBool objectAtIndex:indexPath.section] boolValue];
    for (int i=0; i<[sectionTitleArray count]; i++) {
        if (indexPath.section==i) {
            [arrayForBool replaceObjectAtIndex:i withObject:[NSNumber numberWithBool:!collapsed]];
        }
    }
    [_expandableTableView reloadSections:[NSIndexSet indexSetWithIndex:gestureRecognizer.view.tag] withRowAnimation:UITableViewRowAnimationAutomatic];
    
   }
 }