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