UI4_UITableViewSectionIndex

//  AppDelegate.m
//  UI4_UITableViewSectionIndex
//
//  Created by zhangxueming on 15/7/14.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//

#import "AppDelegate.h"
#import "ViewController.h"

@interface AppDelegate ()

@end

@implementation AppDelegate

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

    return YES;
}

//
//  ViewController.h
//  UI4_UITableViewSectionIndex
//
//  Created by zhangxueming on 15/7/14.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController<UITableViewDataSource, UITableViewDelegate>

@property (strong, nonatomic)UITableView *tableView;
@property (strong, nonatomic)NSMutableArray *dataList;

@end

//
//  ViewController.m
//  UI4_UITableViewSectionIndex
//
//  Created by zhangxueming on 15/7/14.
//  Copyright (c) 2015年 zhangxueming. All rights reserved.
//

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    [self creatUI];
    [self creatDataSource];
}

- (void)creatDataSource
{
    _dataList = [NSMutableArray array];
    for (int i=‘A‘; i<=‘Z‘; i++) {
        NSInteger count = arc4random()%10+1;
        NSMutableArray *array = [NSMutableArray array];
        for (int j=0; j<count; j++) {
            NSString *name = [NSString stringWithFormat:@"人物:%d", j+1];
            [array addObject:name];
        }
        [self.dataList addObject:array];
    }
}

- (void)creatUI
{
    _tableView = [[UITableView alloc] initWithFrame:self.view.frame style:UITableViewStylePlain];
    [self.view addSubview:self.tableView];
    //设置代理
    self.tableView.delegate = self;
    self.tableView.dataSource = self;
    self.automaticallyAdjustsScrollViewInsets = YES;
    self.view.backgroundColor = [UIColor whiteColor];
}

#pragma mark  ---UITableViewDataSource---

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return self.dataList.count;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return [[self.dataList objectAtIndex:section] count];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *cellId = @"cell";
    UITableViewCell *cell = [self.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;
}

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
    return [NSString stringWithFormat:@"第%c分区", (char)(section+‘A‘)];
}

//设置分区头标题的高度
- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
{
    return 50;
}

//创建分区标题数组
- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView
{
    NSMutableArray *array = [NSMutableArray array];
    [array addObject:UITableViewIndexSearch];
    for (int i=‘A‘; i<=‘Z‘; i++) {
        NSString *str = [NSString stringWithFormat:@"%c", (char)i];
        [array addObject:str];
    }
    return array;
}

//切换到指定的分区
- (NSInteger)tableView:(UITableView *)tableView sectionForSectionIndexTitle:(NSString *)title atIndex:(NSInteger)index
{
    return index-1;
}

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

@end