一个tableview的自带动画

[super viewDidLoad];
    //
    [self setEdgesForExtendedLayout:UIRectEdgeNone];//避免布局上移
    
    // Uncomment the following line to preserve selection between presentations.
    // self.clearsSelectionOnViewWillAppear = NO;
    
    // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
    // self.navigationItem.rightBarButtonItem = self.editButtonItem;
    
    //    _dataSource = @{@"面试": @[@"自我介绍", @"如何回答面试官的问题"] ,
    //                    @"薪资": @[@"谈钱牢记四句话", @"面试获高薪资的实战技巧"],
    //                    @"简历": @[@"HR是这样看简历的"]};
    
    self.view.backgroundColor = [UIColor whiteColor];
    self.tableView.backgroundColor = [UIColor whiteColor];
    
    _dataSource = [[NSMutableArray alloc] init];
    
    
    //初始化一条数
    NSDictionary * oraldic1 = @{@"title": @"自我介绍"};
    NSDictionary * oraldic2 = @{@"title": @"如何回答面试官的问题"};
    
    NSArray * oralarray = @[oraldic1, oraldic2];
    
    NSMutableDictionary * dictionary = [[NSMutableDictionary alloc] init];
    [dictionary setObject:oralarray forKey:@"detail"];
    [dictionary setObject:@(NO) forKey:@"isFold"];
    [dictionary setObject:@"面试" forKey:@"title"];
    
    //将数据加入数据源中
    [_dataSource addObject:dictionary];
    
    //初始化第二条数据
    NSDictionary * saldic1 = @{@"title": @"谈钱牢记四句话"};
    NSDictionary * saldic2 = @{@"title": @"面试获高薪资的实战技巧"};
    
    NSArray * salarray = @[saldic1, saldic2];
    NSMutableDictionary * salDictionary = [[NSMutableDictionary alloc] init];
    [salDictionary setObject:salarray forKey:@"detail"];
    [salDictionary setObject:@(NO) forKey:@"isFold"];
    [salDictionary setObject:@"薪资" forKey:@"title"];
    
    [_dataSource addObject:salDictionary];
    
       NSDictionary *dic3=@{@"title":@"HR时这样看简历的"};
      NSArray *arr=@[dic3];
    NSMutableDictionary *saldic=[[NSMutableDictionary alloc]init];
    [saldic setObject:arr forKey:@"detail"];
    [saldic setObject:@(NO) forKey:@"isFold"];
    [saldic setObject:@"简历" forKey: @"title"];
   [_dataSource addObject:saldic];
   
    
    //配置tableview
    self.tableView.rowHeight = 40;
    self.tableView.separatorStyle = UITableViewCellSeparatorStyleNone;
    
    //添加刷新功能
    self.refreshControl = [[UIRefreshControl alloc] init];
    self.refreshControl.attributedTitle = [[NSAttributedString alloc] initWithString:@"下拉刷新"];
    self.refreshControl.tintColor = [UIColor redColor];
    [self.refreshControl addTarget:self action:@selector(doRefreshProcess) forControlEvents:UIControlEventValueChanged];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    // Return the number of sections.
    
    
    return [_dataSource count];
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    // Return the number of rows in the section.
    
    //得到header状态
    BOOL flag = [_dataSource[section][@"isFold"] boolValue];
    return flag ? [_dataSource[section][@"detail"] count] : 0;
}


- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    
    static NSString * identify = @"reuseIdentifier";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:identify];
    if (!cell) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:identify];
    }
    NSString * key = _dataSource[indexPath.section][@"detail"][indexPath.row][@"title"];
    
    cell.textLabel.text = key;
    
    return cell;
}

//- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
//{
//    return _dataSource[section][@"title"];
//}

//创建tableview 头
- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{
    NSString *sectionIdentifier = @"mySection";
    UITableViewHeaderFooterView *headerView = [tableView dequeueReusableHeaderFooterViewWithIdentifier:sectionIdentifier];
    headerView.userInteractionEnabled = YES;
    if (!headerView) {
        //大标题label
        headerView = [[UITableViewHeaderFooterView alloc]initWithReuseIdentifier:sectionIdentifier];
        headerView.contentView.backgroundColor = [UIColor whiteColor];
        UILabel *textLabel = [[UILabel alloc] initWithFrame:CGRectMake(10, 0, 300, 50)];
        textLabel.tag = 201;
        textLabel.textColor = [UIColor blackColor];
        textLabel.backgroundColor = [UIColor whiteColor];
        textLabel.font = [UIFont boldSystemFontOfSize:20];
        [headerView.contentView addSubview:textLabel];
        
        UILabel *lineLabel = [[UILabel alloc] initWithFrame:CGRectMake(10, 45, 375, 1)];
        lineLabel.backgroundColor = [UIColor colorWithWhite:0.9 alpha:1.0];
        [headerView.contentView addSubview:lineLabel];
        
        //展开按钮
        UIButton *openBtn = [[UIButton alloc] initWithFrame:CGRectMake(330, 5, 40, 40)];
        openBtn.tag = 202;
        openBtn.backgroundColor = [UIColor redColor];
        [openBtn.titleLabel setFont:[UIFont systemFontOfSize:20]];
        [openBtn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
        [openBtn setImage:[UIImage imageNamed:@"inter_open"] forState:UIControlStateNormal];
        [openBtn setImage:[UIImage imageNamed:@"inter_close"] forState:UIControlStateSelected];
        [openBtn addTarget:self action:@selector(doFoldAndUnfold:) forControlEvents:UIControlEventTouchUpInside];
        [headerView.contentView addSubview:openBtn];
    }
    
    UILabel *textLabel = (UILabel *)[headerView viewWithTag:201];
    textLabel.text = _dataSource[section][@"title"];
    UIButton *sectionBtn = (UIButton *)[headerView viewWithTag:202];
    //得到展开状态
    BOOL flag = [_dataSource[section][@"isFold"] boolValue];
    sectionBtn.selected = flag ? YES : NO;
    sectionBtn.tag = 300 + section;//重新设定tag值
    
    return headerView;
}

- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
{
    return 50;
}

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    LMdetailController *detail=[[LMdetailController alloc]init];
    [self.navigationController pushViewController:detail animated:YES];
}

- (void)doFoldAndUnfold:(UIButton *)sender
{
    //修改按钮点击状态
    sender.selected = !sender.selected;
    
    NSInteger section = sender.tag - 300;//得到哪组
    //得到数据
    //首先确定展开之后多少行
    NSMutableArray * indexArray = [[NSMutableArray alloc] init];
    NSInteger count = [_dataSource[section][@"detail"] count];
    for (int i = 0; i < count; i ++) {
        NSIndexPath * path = [NSIndexPath indexPathForRow:i inSection:section];
        [indexArray addObject:path];
    }
    
    //同步数据源中的展开状态
    [_dataSource[section] setObject:@(sender.selected) forKey:@"isFold"];
    
    //开始展开动画
    if (sender.selected) {
        [self.tableView insertRowsAtIndexPaths:indexArray withRowAnimation:UITableViewRowAnimationTop];
    } else {
        [self.tableView deleteRowsAtIndexPaths:indexArray withRowAnimation:UITableViewRowAnimationTop];
    }
    
}

- (void)doRefreshProcess
{
    [self.refreshControl beginRefreshing];
    self.refreshControl.attributedTitle = [[NSAttributedString alloc] initWithString:@"刷新中..."];
    NSLog(@"开始刷新");
    
    //模拟网络请求延时处理
    [self performSelector:@selector(refreshUserInterface) withObject:nil afterDelay:1.0];
}

- (void)refreshUserInterface
{
    
    [self.refreshControl endRefreshing];
    self.refreshControl.attributedTitle = [[NSAttributedString alloc] initWithString:@"下拉刷新"];
    NSLog(@"结束");
    //重新刷新tableview
    [self.tableView reloadData];
}