iOS UITableView制作类似QQ好友列表视图

                 

#import <UIKit/UIKit.h>

@interface AppDelegate : UIResponder <UIApplicationDelegate>

@property (strong, nonatomic) UIWindow *window;


@end

#import "AppDelegate.h"
#import "RootViewController.h"
@interface AppDelegate ()

@end

@implementation AppDelegate


- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.
    self.window.backgroundColor = [UIColor whiteColor];
    
    UINavigationController *navi = [[UINavigationController alloc] initWithRootViewController:[[RootViewController alloc] init]];
    self.window.rootViewController = navi;
    
    [self.window makeKeyAndVisible];
    return YES;
}

@end

#import <UIKit/UIKit.h>

@interface RootViewController : UIViewController

@end

#import "RootViewController.h"

@interface RootViewController ()<UITableViewDataSource,UITableViewDelegate>
{
    UITableView *_tableView;
    NSMutableDictionary *dataDic;
}
@end

@implementation RootViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // 初始化_tableView
    [self initializeTableView];
    // 加载数据
    [self loadData];
}
/**
 *  初始化_tableView
 */
- (void)initializeTableView
{
    _tableView = [[UITableView alloc] initWithFrame:[[UIScreen mainScreen] bounds] style:UITableViewStyleGrouped];
    _tableView.dataSource = self;
    _tableView.delegate = self;
    [self.view addSubview:_tableView];
}
/**
 *  加载数据
 */
- (void)loadData
{
    // 数组的第一个对象为标志位（是否展开）
    NSMutableArray *arr1 = [NSMutableArray arrayWithObjects:@"0",@"apple",@"alex",@"alert",@"awake", nil];
    NSMutableArray *arr2 = [NSMutableArray arrayWithObjects:@"0",@"blance",@"bank",@"baby",@"bet",@"balance", nil];
    NSMutableArray *arr3 = [NSMutableArray arrayWithObjects:@"0",@"cake",@"cat",@"caught",@"cell",@"clabe", @"cry",@"cave",nil];
    NSMutableArray *arr4 = [NSMutableArray arrayWithObjects:@"0",@"dog",@"data",@"date",@"drive",@"down", @"deliver",@"dire",@"drawn",@"dety",@"depature",@"dom",nil];
    NSMutableArray *arr5 = [NSMutableArray arrayWithObjects:@"0",@"elphance",@"eleven",@"every",nil];
    // 把对应的数据存入字典
    dataDic = [NSMutableDictionary dictionaryWithObjectsAndKeys:arr1,@"A",arr2,@"B",arr3,@"C",arr4,@"D",arr5,@"E", nil] ;
}

#pragma mark - UITableViewDataSource And UITableViewDelegate - 
// 返回的表头个数
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return [[dataDic allKeys] count];
}
// 每个表头返回对应的行数
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    // 因为字典是无序的，通过比较来进行排序
    NSArray *keys = [[dataDic allKeys] sortedArrayUsingSelector:@selector(compare:)];
    NSString *key = keys[section];
    NSMutableArray *array = dataDic[key];
    NSString *IsExpand = array[0];
    // 如果为“1”则返回相应的行数，否则返回0
    if ([IsExpand isEqualToString:@"1"]) {
        // 因为数组的第一位为标志位所以减1
        return ([array count] - 1);
    }
    return 0;
}

- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
{
    return 45;
}

- (CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section
{
    return 1;
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return 60;
}

- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{
    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, 45)];
    view.backgroundColor = [UIColor colorWithRed:206 green:206 blue:206 alpha:1];
    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(20, 0, [UIScreen mainScreen].bounds.size.width - 20, 45)];
    label.font = [UIFont systemFontOfSize:30];
    label.backgroundColor = [UIColor clearColor];
    label.textColor = [UIColor blackColor];
    NSArray *keys = [[dataDic allKeys] sortedArrayUsingSelector:@selector(compare:)];
    label.text = keys[section];
    [view addSubview:label];
    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    button.frame = CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, 45);
    [button addTarget:self action:@selector(buttonAction:) forControlEvents:UIControlEventTouchUpInside];
    button.tag = 1000 + section;
    [view addSubview:button];
    return view;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *identifier = @"cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:identifier];
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:identifier];
    }
    NSArray *keys = [[dataDic allKeys] sortedArrayUsingSelector:@selector(compare:)];
    NSString *key = keys[indexPath.section];
    NSMutableArray *array = dataDic[key];
    // 由于数组的第一位是标志位，且不用显示，所以加1
    NSString *textStr = array[indexPath.row + 1];
    cell.textLabel.text = textStr;
    return cell;
}

#pragma mark -Target Action-
/**
 *  点击表头，如果没有展开，则展开；如果已经展开，则关闭
 */
- (void)buttonAction:(UIButton *)sender
{
    long section = sender.tag - 1000;
    NSArray *keys = [[dataDic allKeys] sortedArrayUsingSelector:@selector(compare:)];
    NSString *key = keys[section];
    NSMutableArray *array = dataDic[key];
    NSString *IsExpand = array[0];
    // 如果IsExpand等于“0”（关闭状态），则展开，且设置其值为“1”；相反，如果IsExpand等于“1”（展开状态），则关闭，且设置其值为“0”
    if ([IsExpand isEqualToString:@"0"]) {
        array[0] = @"1";
    }else{
        array[0] = @"0";
    }
    [_tableView reloadData];
}
@end