电话本索引【表视图】

MainViewController.h

@interface RootViewController : UIViewController<UITableViewDelegate,UITableViewDataSource>

@property(nonatomic, retain)NSDictionary *dic;
@property(nonatomic, retain)NSArray *allKeys;

MainViewController.m

- (void)viewDidLoad
{
    [super viewDidLoad];

    //创建表视图
    UITableView *tableView = [[UITableView alloc] initWithFrame:CGRectMake(0, 20, 320, 460) style:UITableViewStylePlain];
    tableView.delegate = self;
    tableView.dataSource = self;
    [self.view addSubview:tableView];
    [tableView release];

    NSString *path = [[NSBundle mainBundle] pathForResource:@"ListData.plist" ofType:nil];//  ／ListData.plist
    _dic = [[NSDictionary alloc] initWithContentsOfFile:path];

    //取得key
//    _allKeys = [_dic allKeys];

    /*
     sortedArrayUsingSelector:遍历数组中的每一个元素，调用后面的方法
     */
    _allKeys = [[[_dic allKeys] sortedArrayUsingSelector:@selector(compare:)] retain];

    //设置侧栏的背景颜色
    tableView.sectionIndexBackgroundColor = [UIColor blackColor];
}

/*

 字典的结构
 A : ["asd","ase","aer","add"],
 B : ["bsd","bse","br","bd"],
 C : ["cc","cd"],
 ......
 */

#pragma mark - UITableView dataSource
//设置组的个数
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {

    return _dic.count;
}

//设置每组有多少个cell
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {

    NSString *key = [_allKeys objectAtIndex:section];
    NSArray *value = [_dic objectForKey:key];
    return value.count;
}

//创建cell
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    static NSString *inde = @"cell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:inde];

    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:inde] autorelease];
    }

    NSString *key = [_allKeys objectAtIndex:indexPath.section];
    NSArray *value = [_dic objectForKey:key];

    cell.textLabel.text = value[indexPath.row];

    return cell;
}

//设置组的头视图标题
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {

   return [_allKeys objectAtIndex:section];

}

- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView {

    return _allKeys;
}

//点击右侧索引栏调用的方法
//返回的是组的索引
- (NSInteger)tableView:(UITableView *)tableView sectionForSectionIndexTitle:(NSString *)title atIndex:(NSInteger)index {

    NSLog(@"title:%@",title);

   NSInteger a = [_allKeys indexOfObject:title];

    return a + 2;

}