iOS开发之tableView cell的展开收回功能实现代码

#import "ZCellGroupController.h"

@interface ZCellGroupController ()<UITableViewDelegate, UITableViewDataSource>

@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