iOS tabview如何添加字母索引

//系統(tǒng)獲取首字母
- (NSString *) pinyinFirstLetter:(NSString*)sourceString {
 NSMutableString *source = [sourceString mutableCopy];
 CFStringTransform((__bridge CFMutableStringRef)source, NULL, kCFStringTransformMandarinLatin, NO);
 CFStringTransform((__bridge CFMutableStringRef)source, NULL, kCFStringTransformStripDiacritics, NO);//這一行是去聲調(diào)的
 return source;
}

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

@interface ViewController (){
 NSMutableArray<Person *> *dataArray;
}
//排序后的出現(xiàn)過的拼音首字母數(shù)組
@property(nonatomic,strong)NSMutableArray *indexArray;
//排序好的結(jié)果數(shù)組
@property(nonatomic,strong)NSMutableArray *letterResultArr;
@end

@implementation ViewController

- (void)viewDidLoad {
 [super viewDidLoad];

 //模擬數(shù)據(jù)加載 dataArray中得到Person的數(shù)組
 [self loadData];

 //BMChineseSort 文件包含兩個對單元格數(shù)據(jù)和右側(cè)字母的數(shù)組排序函數(shù)
 //根據(jù)Person對象的 name 屬性 按中文 對 Person數(shù)組 排序
 //每一個單元格的數(shù)據(jù)，排序好了的
 self.indexArray = [BMChineseSort IndexWithArray:dataArray Key:@"name"];
 //左側(cè)的字母數(shù)組，已經(jīng)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];
}
//加載模擬數(shù)據(jù)
-(void)loadData{
 NSArray *stringsToSort=[NSArray arrayWithObjects:
       @"李白",@"張三",
       @"重慶",@"重量",
       @"調(diào)節(jié)",@"調(diào)用",
       @"小白",@"小明",@"千玨",
       @"黃家駒", @"鼠標(biāo)",@"hello",@"多美麗",@"肯德基",@"##",
       nil];

 //模擬網(wǎng)絡(luò)請求接收到的數(shù)組對象 Person數(shù)組
 dataArray = [[NSMutableArray alloc] initWithCapacity:0];
 for (int i = 0; i<[stringsToSort count]; i++) {
  Person *p = [[Person alloc] init];
  p.name = [stringsToSort objectAtIndex:i];
  p.number = i;
  [dataArray addObject:p];
 }
}

#pragma mark - UITableView -
//section的titleHeader
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {
 return [self.indexArray objectAtIndex:section];
}
//section行數(shù)
-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
 return [self.indexArray count];
}
//每組section個數(shù)
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
 return [[self.letterResultArr objectAtIndex:section] count];
}
//section右側(cè)index數(shù)組
-(NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView{
 return self.indexArray;
}
//點擊右側(cè)索引表項時調(diào)用 索引與section的對應(yīng)關(guān)系
- (NSInteger)tableView:(UITableView *)tableView sectionForSectionIndexTitle:(NSString *)title atIndex:(NSInteger)index{
 return index;
}
//返回cell
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
 UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"CELL"];
 if (cell == nil){
  cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"CELL"];
 }
 //獲得對應(yīng)的Person對象<替換為你自己的model對象>
 Person *p = [[self.letterResultArr objectAtIndex:indexPath.section] objectAtIndex:indexPath.row];
 cell.textLabel.text = p.name;
 return cell;
}
@end