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