iOS tabview添加字母索引的教程

//系统获取首字母
- (NSString *) pinyinFirstLetter:(NSString*)sourceString {
 NSMutableString *source = [sourceString mutableCopy];
 CFStringTransform((__bridge CFMutableStringRef)source, NULL, kCFStringTransformMandarinLatin, NO);
 CFStringTransform((__bridge CFMutableStringRef)source, NULL, kCFStringTransformStripDiacritics, NO);//这一行是去声调的
 return source;
}

#import "ViewController.h"
#import "BMChineseSort.h"
#import "Person.h"

@interface ViewController (){
 NSMutableArray *dataArray;
}
//排序后的出现过的拼音首字母数组
@property(nonatomic,strong)NSMutableArray *indexArray;
//排序好的结果数组
@property(nonatomic,strong)NSMutableArray *letterResultArr;
@end

@implementation ViewController

- (void)viewDidLoad {
 [super viewDidLoad];

 //模拟数据加载 dataArray中得到Person的数组
 [self loadData];

 //BMChineseSort 文件包含两个对单元格数据和右侧字母的数组排序函数
 //根据Person对象的 name 属性 按中文 对 Person数组 排序
 //每一个单元格的数据，排序好了的
 self.indexArray = [BMChineseSort IndexWithArray:dataArray Key:@"name"];
 //左侧的字母数组，已经排序好了
 self.letterResultArr = [BMChineseSort sortObjectArray:dataArray Key:@"name"];

 UITableView *table = [[UITableView alloc] initWithFrame:self.view.frame];
 table.delegate = self;
 table.dataSource = self;
 [self.view addSubview:table];
}
//加载模拟数据
-(void)loadData{
 NSArray *stringsToSort=[NSArray arrayWithObjects:
       @"李白",@"张三",
       @"重庆",@"重量",
       @"调节",@"调用",
       @"小白",@"小明",@"千珏",
       @"黄家驹", @"鼠标",@"hello",@"多美丽",@"肯德基",@"##",
       nil];

 //模拟网络请求接收到的数组对象 Person数组
 dataArray = [[NSMutableArray alloc] initWithCapacity:0];
 for (int i = 0; i
 Person *p = [[self.letterResultArr objectAtIndex:indexPath.section] objectAtIndex:indexPath.row];
 cell.textLabel.text = p.name;
 return cell;
}
@end