ios tableView 的cell打开收起功能，类似QQ中的cell折叠功能

通过点击sectionView实现section下属的cell关闭或打开，类似QQ联系人界面的功能。

#import "ViewController.h"

#define ALLWIDTH [UIScreen mainScreen].bounds.size.width
#define ALLHEIGHT [UIScreen mainScreen].bounds.size.height

@interface ViewController ()<UITableViewDelegate,UITableViewDataSource>
{
    UITableView*tableview;
    NSArray *dataArr;
    NSMutableArray *isOpenArr;
    
}
@end

@implementation ViewController


- (void)viewDidLoad {
    [super viewDidLoad];
    
    tableview = [[UITableView alloc]initWithFrame:CGRectMake(0, 40, ALLWIDTH, ALLHEIGHT-40)];
    tableview.delegate =self;
    tableview.dataSource = self;
    tableview.tableFooterView = [[UIView alloc]init];
    [self.view addSubview:tableview];
    
    
    dataArr = [NSArray array];
    dataArr = @[@"cell1",@"cell2",@"cell3",@"cell4",@"cell5"];
    
    isOpenArr = [NSMutableArray array];
    
    for (int i =0; i< dataArr.count; i++) {
        
        [isOpenArr addObject:@"0"];
    }
    
}
-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 5;
}
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    if([isOpenArr[section] isEqualToString:@"1"])
    {
        return dataArr.count;
    }else{
        return 0;
    }
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSString *cellstr = @"cell";
    UITableViewCell *cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellstr];
    if (!cell) {
        cell = [tableview dequeueReusableCellWithIdentifier:cellstr forIndexPath:indexPath];
    }
    
    cell.textLabel.text = dataArr[indexPath.row];
    
    return cell;

}

-(CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
{
    return 50;
}

-(UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{
    UIView *view  =[[UIView alloc]init];
    UILabel *lable = [[UILabel alloc]initWithFrame:CGRectMake(0, 0,ALLWIDTH, 50)];
    lable.text =  [NSString stringWithFormat:@"------------第%ld组---------",(long)section];
    lable.textColor = [UIColor redColor];
    [view addSubview:lable];
    
    //添加点击手势
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(topgesture:)];
    [view addGestureRecognizer:tap];
    
    view.tag = section;
    return view;

}

-(void)topgesture:(UITapGestureRecognizer*)tap
{
    NSInteger index = tap.view.tag;
    
    if ([isOpenArr[index] isEqualToString:@"1"]) {
        
        [isOpenArr replaceObjectAtIndex:index withObject:@"0"];

    }else{
        [isOpenArr replaceObjectAtIndex:index withObject:@"1"];
        
    }
    [tableview reloadData];
    
}

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    [tableview deselectRowAtIndexPath:indexPath animated:YES];
    NSLog(@"------================--%ld-----",indexPath.row);
}