实现代码很简单，就不多赘述了。
/** 数据源 */
@property (nonatomic,strong)NSMutableArray *sourceData;
/** 记录展开的section */
@property (nonatomic, strong) NSMutableArray *btnArr;
- (void)viewDidLoad {
[super viewDidLoad];
self.tableView = [[UITableView alloc]initWithFrame:self.view.bounds style:UITableViewStyleGrouped];
[self.tableView registerClass:[UITableViewHeaderFooterView class] forHeaderFooterViewReuseIdentifier:@"header"];
}
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return self.sourceData.count;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
if ([self.btnArr containsObject:[NSNumber numberWithInteger:section]])
{
//包含 展开的
return [self.sourceData[section][@"cellData"] count];
}
else
{
return 0;
}
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *reusid = @"cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:reusid];
if (!cell) {
cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:reusid];
}
cell.textLabel.text = self.sourceData[indexPath.section][@"cellData"][indexPath.row];
return cell;
}
- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{
UITableViewHeaderFooterView *header = [tableView dequeueReusableHeaderFooterViewWithIdentifier:@"header"];
while (!header.contentView.subviews.count) {
//没有 需要添加一个button
UIButton *btn = [[UIButton alloc]initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH, 50)];
[header.contentView addSubview:btn];
btn.backgroundColor = [UIColor whiteColor];
[btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
}
UIButton *btn = [header.contentView.subviews firstObject];
[btn setTitle:self.sourceData[section][@"groupTitle"] forState:UIControlStateNormal];
[btn addTarget:self action:@selector(btnClcik:) forControlEvents:UIControlEventTouchUpInside];
btn.tag = section;
return header;
}
- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
{
return 50;
}
- (CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section
{
return 1;
}
- (void)btnClcik:(UIButton *)btn
{
if ([self.btnArr containsObject:[NSNumber numberWithInteger:btn.tag]])
{
//已经展开的
[self.btnArr removeObject:[NSNumber numberWithInteger:btn.tag]];
}else
{
[self.btnArr addObject:[NSNumber numberWithInteger:btn.tag]];
}
[self.tableView reloadSections:[NSIndexSet indexSetWithIndex:btn.tag] withRowAnimation:UITableViewRowAnimationAutomatic];
}
/**
* 数据源的构造 字典数组
*
* @return <#return value description#>
*/
- (NSMutableArray *)sourceData
{
if (!_sourceData) {
_sourceData = [[NSMutableArray alloc]init];
for (NSInteger i = 0 ; i < 5 ; i ++ ) {
NSMutableDictionary *dic = [[NSMutableDictionary alloc]init];
NSArray *arr = [[NSArray alloc]initWithObjects:@"武松",@"西门庆",@"潘金莲",@"陈翔", nil];
dic[@"cellData"] = arr;
NSString *title = [NSString stringWithFormat:@"第%zd组",i];
dic[@"groupTitle"] = title;
[_sourceData addObject:dic];
}
}
return _sourceData;
}
- (NSMutableArray *)btnArr
{
if (!_btnArr) {
_btnArr = [[NSMutableArray alloc]init];
}
return _btnArr;
}