iOS开发之tableView cell的展开收回功能实现代码

 #import "ZCellGroupController.h" @interface ZCellGroupController () @property (nonatomic, strong) UITableView *tableView; @property (nonatomic, strong) NSArray *titleArray;//分组 @property (nonatomic, strong) NSArray *friendsArray;//每组对应内容 @property (nonatomic, strong) NSMutableArray *selectedArr;//存储需要展开的cell组 @end @implementation ZCellGroupController -(void)viewDidLoad { [super viewDidLoad]; self.selectedArr = [[NSMutableArray alloc]init]; [self addTableView]; [self addData]; } - (void)addTableView{ UITableView *tableView = [[UITableView alloc]initWithFrame:CGRectMake(0, 0, kSCREENWIDTH, kScreenHeight) style:UITableViewStyleGrouped]; self.tableView = tableView; tableView.delegate = self; tableView.dataSource = self; tableView.separatorStyle = UITableViewCellSeparatorStyleSingleLine; [self.view addSubview:_tableView]; } - (void)addData{ self.titleArray = [NSArray arrayWithObjects:@"好友",@"陌生人", nil]; self.friendsArray = [NSArray arrayWithObjects: @[@"A",@"B",@"C",@"D",@"E",@"F"], @[@"陌生1",@"陌生2",@"陌生3",@"陌生4",@"陌生5",@"陌生6",@"陌生7",@"陌生8",@"陌生9",@"陌生10",@"陌生11",@"陌生12",@"陌生13",@"陌生14"],nil]; } #pragma mark --tableViewDelegate - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{ return self.titleArray.count; } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{ NSString *sectionStr = [NSString stringWithFormat:@"%ld",(long)section]; NSInteger num ; //如果selectedArr不包含section，该分组返回number为0； if ([self.selectedArr containsObject:sectionStr]) { NSArray *arrayData = self.friendsArray[section]; num = arrayData.count ; }else{ num = 0; } return num; } - (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section{ return 40; } - (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section{ UIView *view = [[UIView alloc]initWithFrame:CGRectMake(0, 0, kSCREENWIDTH, 40)]; view.backgroundColor = [UIColor whiteColor]; UILabel *titleLabel = [[UILabel alloc]initWithFrame:CGRectMake(10, 5,kSCREENWIDTH-20 , 30)]; titleLabel.text = self.titleArray[section]; [view addSubview:titleLabel]; //添加点击事件 UIButton *btn = [[UIButton alloc]initWithFrame:CGRectMake(0, 0, kSCREENWIDTH, 40)]; btn.tag = 100+section; [btn addTarget:self action:@selector(viewBtnClick:) forControlEvents:UIControlEventTouchUpInside]; [view addSubview:btn]; return view; } - (void)viewBtnClick:(UIButton *)btn{ NSString *string = [NSString stringWithFormat:@"%ld",btn.tag - 100]; if ([self.selectedArr containsObject:string]) { [self.selectedArr removeObject:string]; }else{ [self.selectedArr addObject:string]; } NSLog(@"selectedArr:%@",self.selectedArr); [_tableView reloadData]; } - (CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section{ return 10; } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{ NSString *sectionStr = [NSString stringWithFormat:@"%ld",(long)indexPath.section]; static NSString *cellID = @"testCellID"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellID]; if (!cell) { cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellID]; cell.selectionStyle = UITableViewCellSelectionStyleGray; } NSArray *arrayData = self.friendsArray[indexPath.section]; if ([self.selectedArr containsObject:sectionStr]) { cell.textLabel.text = arrayData[indexPath.row]; } return cell; } - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{ return 45; } @end