IOS实现展开二级列表效果

#import "XDMultTableView.h"
...
@property(nonatomic, readwrite, strong)XDMultTableView *tableView;

 _tableView = [[XDMultTableView alloc] initWithFrame:CGRectMake(0, 64, self.view.frame.size.width, self.view.frame.size.height-64)];
 _tableView.openSectionArray = [NSArray arrayWithObjects:@1,@2, nil];
 _tableView.delegate = self;
 _tableView.datasource = self;
 _tableView.backgroundColor = [UIColor whiteColor];
 [self.view addSubview:_tableView];

- (NSInteger)mTableView:(XDMultTableView *)mTableView numberOfRowsInSection:(NSInteger)section{
 return 5;
}

- (XDMultTableViewCell *)mTableView:(XDMultTableView *)mTableView
    cellForRowAtIndexPath:(NSIndexPath *)indexPath{
 static NSString *cellIdentifier = @"cell";
 UITableViewCell *cell = [mTableView dequeueReusableCellWithIdentifier:cellIdentifier];
 if (cell == nil)
 {
  cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
 }
 UIView *view = [[UIView alloc] initWithFrame:cell.bounds] ;
 view.layer.backgroundColor = [UIColor whiteColor].CGColor;
 view.layer.masksToBounds = YES;
 view.layer.borderWidth  = 0.3;
 view.layer.borderColor  = [UIColor lightGrayColor].CGColor;

 cell.backgroundView = view;
 cell.selectionStyle = UITableViewCellSelectionStyleNone;

 return cell;
}

- (NSInteger)numberOfSectionsInTableView:(XDMultTableView *)mTableView{
 return 6;
}

-(NSString *)mTableView:(XDMultTableView *)mTableView titleForHeaderInSection:(NSInteger)section{
 return @"我是头部";
}

- (CGFloat)mTableView:(XDMultTableView *)mTableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
 return 50;
}

- (CGFloat)mTableView:(XDMultTableView *)mTableView heightForHeaderInSection:(NSInteger)section{
 return 40;
}

- (void)mTableView:(XDMultTableView *)mTableView willOpenHeaderAtSection:(NSInteger)section{
 NSLog(@"即将展开");
}

- (void)mTableView:(XDMultTableView *)mTableView willCloseHeaderAtSection:(NSInteger)section{
 NSLog(@"即将关闭");
}

- (void)mTableView:(XDMultTableView *)mTableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
 NSLog(@"点击cell");
}

//section header view 设置tag值为section
view.tag = section;
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapHeader:)];
 [view addGestureRecognizer:tap];

- (void)tapHeader:(UITapGestureRecognizer *) tap {
 NSInteger section = tap.view.tag;
 NSNumber *sectionObj = [NSNumber numberWithInteger:section];
 UIImageView *imageView = (UIImageView *)[tap.view viewWithTag:100];
 //_multopenSectionArray 用于记录每个 section的展开和关闭状态
 if ([_multopenSectionArray containsObject:sectionObj]) {
  NSArray *deleteArray = [self buildDeleteRowWithSection:section];
  [_multopenSectionArray removeObject:sectionObj];
  //想关闭的section的所有indexPath
  [_tableView deleteRowsAtIndexPaths:deleteArray withRowAnimation:UITableViewRowAnimationFade];
  [UIView animateWithDuration:0.3 animations:^{
   imageView.transform = CGAffineTransformMakeRotation(-M_PI/2);
  }];
 }else{
  [_multopenSectionArray addObject:sectionObj];
  //想展开的section的所有indexPath
  NSArray *insertArray = [self buildInsertRowWithSection:section];
  [_tableView insertRowsAtIndexPaths:insertArray withRowAnimation:UITableViewRowAnimationFade];
  [UIView animateWithDuration:0.3 animations:^{
   imageView.transform = CGAffineTransformMakeRotation(0);
  }];
 }
}