IOS UITableView分组与索引分区实例

 #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];

     RootViewController *root = [[RootViewController alloc] init];
     UINavigationController *navi = [[UINavigationController alloc] initWithRootViewController:root];
     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)loadView
 {
     [super loadView];
     _tableView = [[UITableView alloc] initWithFrame:[[UIScreen mainScreen] bounds] style:UITableViewStyleGrouped];
     _tableView.delegate = self;
     _tableView.dataSource = self;
     [self.view addSubview:_tableView];
 }

 - (void)viewDidLoad {
     [super viewDidLoad];
     NSArray *A = [NSArray arrayWithObjects:@"app",@"apple",@"alex",@"alert",@"alright",@"at",@"addic",@"awake",@"action",@"active", nil];
     NSArray *B = [NSArray arrayWithObjects:@"belance",@"beyond",@"bell",@"bill",@"bet",@"bety",@"bright",@"beaty",@"beat",@"bite",@"bit",@"bake",@"blake",@"basket",@"basketball",@"ball",@"black",@"blue", nil];
     NSArray *C = [NSArray arrayWithObjects:@"cake",@"cat",@"cap",@"cook",@"cooki",@"cate",@"cell",@"certain",@"city",@"clabe",@"clab",@"copy",@"cry", nil];
     NSArray *D = [NSArray arrayWithObjects:@"dirty",@"del",@"directly",@"dry",@"dull",@"delly",@"dute", nil];
     NSArray *E = [NSArray arrayWithObjects:@"elphance",@"every",@"else",@"emperty", nil];
     NSArray *F = [NSArray arrayWithObjects:@"fly",@"flash",@"flag",@"fate",@"felt",@"fill",@"fell",@"fall",@"font",@"fake",@"flour",@"ferver",@"fetech", nil];
     NSArray *G = [NSArray arrayWithObjects:@"girl",@"gipe",@"grap",@"gray",@"gay",@"gita",@"git",@"get",@"great",@"glass",@"glasses",@"good",@"google", nil];
     dataDic = [NSMutableDictionary dictionaryWithObjectsAndKeys:A,@"A",B,@"B",C,@"C",D,@"D",E,@"E",F,@"F",G,@"G", nil];
 }

 #pragma mark -UITableView Delegate-

 - (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView
 {
     return [[dataDic allKeys] sortedArrayUsingSelector:@selector(compare:)];
 }

 - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
 {
     return [dataDic allKeys].count;
 }

 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
 {
     NSArray *keys = [[dataDic allKeys] sortedArrayUsingSelector:@selector(compare:)];
     NSString *key = keys[section];
     NSArray *array = dataDic[key];
     return [array count];
 }

 - (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
 {
     NSArray *keys = [[dataDic allKeys] sortedArrayUsingSelector:@selector(compare:)];
     NSString *key = keys[section];
     return key;
 }

 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
 {
     static NSString *identify = @"cell";
     UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:identify];
     if (cell == nil) {
         cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:identify];
     }
     NSArray *keys = [[dataDic allKeys] sortedArrayUsingSelector:@selector(compare:)];
     NSString *key = keys[indexPath.section];
     NSArray *array = dataDic[key];
     NSString *content = array[indexPath.row];
     cell.textLabel.text = content;
     return cell;
 }

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

 @end