UI2_QQ折叠-UITableViewController

//  CustomUITableViewController.h
//  UI2_QQ折叠-UITableViewController
//
//  Created by zhangxueming on 15/7/15.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface CustomUITableViewController : UITableViewController
{
    int sectionState[20];//标志分区的状态
}

//提供数据源
@property (nonatomic, retain)NSMutableArray *dataList;

@end

//
//  CustomUITableViewController.m
//  UI2_QQ折叠-UITableViewController
//
//  Created by zhangxueming on 15/7/15.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//

#import "CustomUITableViewController.h"

#define FoldImageName @"arrow_fold"
#define SpreadImageName @"arrow_spread"

@interface CustomUITableViewController ()

@end

@implementation CustomUITableViewController

- (instancetype)initWithStyle:(UITableViewStyle)style
{
    self = [super initWithStyle:style];
    if (self) {
        self.title = @"QQ折叠";
        self.dataList = [NSMutableArray array];
    }
    return self;
}

- (void)creatData
{
    for (int i=0; i<20; i++) {
        NSMutableArray *array = [NSMutableArray array];
        for (int j=0; j<5; j++) {
            NSString *name = [NSString stringWithFormat:@"小明%d", j+1];
            [array addObject:name];
        }
        [_dataList addObject:array];
    }
}
//设置分区的个数
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return self.dataList.count;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    //根据分区的状态返回行数
    if (sectionState[section]) {
        return 0;
    }
    return [[self.dataList objectAtIndex:section] count];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *cellId = @"cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellId];
    if (!cell) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:cellId];
    }
    cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
    cell.textLabel.text = [[self.dataList objectAtIndex:indexPath.section] objectAtIndex:indexPath.row];

    return cell;
}

//设置分区头视图

- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{
    UIView *headerView = [[UIView alloc] initWithFrame:CGRectZero];
    headerView.backgroundColor = [UIColor lightGrayColor];
    UILabel *lineLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 43, self.view.frame.size.width, 3)];
    lineLabel.backgroundColor = [UIColor grayColor];
    [headerView addSubview:lineLabel];

    //加载图片
    UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(10, 7, 32, 32)];
    if (sectionState[section]) {//收起的状态
        imageView.image = [UIImage imageNamed:FoldImageName];
    }
    else
    {
        imageView.image = [UIImage imageNamed:SpreadImageName];
    }
    [headerView addSubview:imageView];

    //添加点击手势
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapClick:)];
    tap.numberOfTapsRequired  = 1;
    tap.numberOfTouchesRequired = 1;
    headerView.userInteractionEnabled = YES;
    [headerView addGestureRecognizer:tap];
    //tag值
    headerView.tag = section;

    return headerView;
}
//0000 0000  ==0
//0000 0001 ^
//-----------
//0000 0001  ==1

//0000 0001  ==1
//0000 0001 ^
//-----------
//0000 0000  ==0

- (void)tapClick:(UITapGestureRecognizer *)tap
{
    NSLog(@"-------");
    NSInteger index = tap.view.tag;
    sectionState[index] ^=1;
    [self.tableView reloadSections:[NSIndexSet indexSetWithIndex:index] withRowAnimation:UITableViewRowAnimationFade];
}

- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
{
    return 46;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    [self creatData];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

//  AppDelegate.m
//  UI2_QQ折叠-UITableViewController
//
//  Created by zhangxueming on 15/7/15.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//

#import "AppDelegate.h"
#import "CustomUITableViewController.h"

@interface AppDelegate ()

@end

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    CustomUITableViewController *root = [[CustomUITableViewController alloc] init];
    UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:root];
    self.window.rootViewController = nav;
    self.window.backgroundColor = [UIColor whiteColor];

    return YES;
}