iOS实现类似QQ的好友列表，自由展开折叠（在原来TableView的基础上添加一个字典，一个Button）

//直接代码 只包含 折叠展开字典的处理搭建

#import "CFViewController.h"

@interface CFViewController ()<UITableViewDelegate,UITableViewDataSource>
{
    UITableView *CFTableView;
    //数据
    NSArray * CFOnearray;
    NSMutableArray *CFArray;
    NSArray *CFDetailArray;
   CGFloat HeightNormal;

    NSArray *arrayTitle;//
    NSArray * arraymodeltext;//内部分组Title
    CGFloat height0;//返回的高度

    //按钮的状态相关
    NSMutableDictionary * stateDict;//保存状态字典

}
@end
//chufang
@implementation CFViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    [self SetCustomBarWithLeftImage:@"ic_return" leftBtnString:nil titleText:@"处方" rightImageName:nil rightBtnSring:nil target:self];

    [self loadData];

}

-(void)loadData{

    HeightNormal = IPHONEHIGHT();
    CFArray = [NSMutableArray array];

    //包含状态的字典。  值为1 是展开状态 0收缩，，，以section为键
    stateDict = [[NSMutableDictionary alloc]init];
    arrayTitle = @[@"号: ",@"添加时间: ",@"诊: ",@"明细: ",@"金额: ",@"开: "];

    [[GetUrlSession shareUrlconnection]connetion:[NSString stringWithFormat:@"%@?org_code=%@&clinic_id=%@",CFUrlStr,_jzmodel.org_code,_jzmodel.clinic_id] Haget:^(NSDictionary *data, NSError *error, NSHTTPURLResponse *response) {

        //CFOnearray 时下载的数据。如果为空了。就不搭建UI

              if (CFOnearray.count>) {

            dispatch_async(dispatch_get_main_queue(), ^{
                [MBProgressHUD hideHUDForView:self.view animated:YES];

                [self creatUI];

            });

        }else{

            dispatch_async(dispatch_get_main_queue(), ^{
                [MBProgressHUD hideHUDForView:self.view animated:YES];

                [self CreatNilUI];

            });
        }

    }];

}

-(void)creatUI{

   //创建tableView
}

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
    return CFOnearray.count;
}

//每一组 返回的行数。通过判断字典进行 看是否要展开
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{

    NSString * sectionNum = [NSString stringWithFormat:@"%ld",section];

    NSString* state = [stateDict objectForKey:sectionNum];

    if ([state isEqualToString:@""]) {

        return ;

    }else{

        return ;
    }

}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{

       return cell;
}
//在透视图上添加一个button。进行监听点击事件
-(UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section{
    UIButton *backView = [[UIButton alloc]initWithFrame:CGRectMake(, , ScreenWidth, IPHONEHIGHT())];

    CFModel * model = CFOnearray[section];

    backView.tag = +section;
    [backView addTarget: self action:@selector(tapDown:) forControlEvents:UIControlEventTouchUpInside];
    backView.backgroundColor = [UIColor whiteColor];

    UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(IPHONEWIDTH(), IPHONEHIGHT(),ScreenWidth- IPHONEWIDTH(), IPHONEHIGHT())];

    label.font = [UIFont systemFontOfSize:IPHONEWIDTH()];
    label.textColor = shense;

    //组头大名字设定
    label.text = [NSString stringWithFormat:@"%@(%@)",model.diagnosis,dateSring];
    [backView addSubview:label];

    UIButton *btn = [[UIButton alloc]initWithFrame:CGRectMake(IPHONEWIDTH(), IPHONEHIGHT(), IPHONEWIDTH(), IPHONEHIGHT())];
    btn.tag = +section;

    /////////////////////////判断是否展开折叠 改变button的状态
    NSString * sectionNum = [NSString stringWithFormat:@"%ld",section];

    NSString* state = [stateDict objectForKey:sectionNum];

    if ([state isEqualToString:@""]) {

        btn.selected = YES;

    }else{

        btn.selected = NO;

    }

    [btn setImage:[UIImage imageNamed:@"ic_home_hospital_close"] forState:UIControlStateNormal];
    [btn setImage:[UIImage imageNamed:@"ic_home_hospital_open"] forState:UIControlStateSelected];
    [backView addSubview:btn];
    //线
    UIView *grayView = [[UIView alloc]initWithFrame:CGRectMake(, backView.bottom-, ScreenWidth, )];
    grayView.backgroundColor = [UIColor colorWithHexString:@"f2f2f2"];
    [backView addSubview:grayView];
    return backView ;
}
//触发方法  改变字典的值
-(void)tapDown:(UIButton *)sender{

    NSString * section = [NSString stringWithFormat:@"%ld",sender.tag-];

    NSString* state = [stateDict objectForKey:section];

    if ([state isEqualToString:@""]) {

        state = @"";
        [stateDict setObject:state forKey:section];

    }else{

        state = @"";
        [stateDict setObject:state forKey:section];

    }

    [CFTableView reloadData];

}

-(CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section{
    return IPHONEHIGHT();
}
-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{

    return ;
}

//cell线到左边
-(void)viewDidLayoutSubviews {

    if ([CFTableView respondsToSelector:@selector(setSeparatorInset:)]) {
        [CFTableView setSeparatorInset:UIEdgeInsetsZero];

    }
    if ([CFTableView respondsToSelector:@selector(setLayoutMargins:)])  {
        [CFTableView setLayoutMargins:UIEdgeInsetsZero];
    }

}
-(void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPat{
    if ([cell respondsToSelector:@selector(setLayoutMargins:)]) {
        [cell setLayoutMargins:UIEdgeInsetsZero];
    }
    if ([cell respondsToSelector:@selector(setSeparatorInset:)]){
        [cell setSeparatorInset:UIEdgeInsetsZero];
    }
}

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

}

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

/*
 #pragma mark - Navigation

 // In a storyboard-based application, you will often want to do a little preparation before navigation
 - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
 // Get the new view controller using [segue destinationViewController].
 // Pass the selected object to the new view controller.
 }
 */

@end