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:@"",@"apple",@"alex",@"alert",@"awake", nil];
     NSMutableArray *arr2 = [NSMutableArray arrayWithObjects:@"",@"blance",@"bank",@"baby",@"bet",@"balance", nil];
     NSMutableArray *arr3 = [NSMutableArray arrayWithObjects:@"",@"cake",@"cat",@"caught",@"cell",@"clabe", @"cry",@"cave",nil];
     NSMutableArray *arr4 = [NSMutableArray arrayWithObjects:@"",@"dog",@"data",@"date",@"drive",@"down", @"deliver",@"dire",@"drawn",@"dety",@"depature",@"dom",nil];
     NSMutableArray *arr5 = [NSMutableArray arrayWithObjects:@"",@"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[];
     // 如果为“1”则返回相应的行数，否则返回0
     if ([IsExpand isEqualToString:@""]) {
         // 因为数组的第一位为标志位所以减1
         return ([array count] - );
     }
     return ;
 }

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

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

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

 - (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
 {
     UIView *view = [[UIView alloc] initWithFrame:CGRectMake(, , [UIScreen mainScreen].bounds.size.width, )];
     view.backgroundColor = [UIColor colorWithRed: green: blue: alpha:];
     UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(, , [UIScreen mainScreen].bounds.size.width - , )];
     label.font = [UIFont systemFontOfSize:];
     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(, , [UIScreen mainScreen].bounds.size.width, );
     [button addTarget:self action:@selector(buttonAction:) forControlEvents:UIControlEventTouchUpInside];
     button.tag =  + 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 + ];
     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 - ;
     NSArray *keys = [[dataDic allKeys] sortedArrayUsingSelector:@selector(compare:)];
     NSString *key = keys[section];
     NSMutableArray *array = dataDic[key];
     NSString *IsExpand = array[];
     // 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:@""]) {
         array[] = @"";
     }else{
         array[] = @"";
     }
     [_tableView reloadData];
 }
 @end