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关键代码，demo在最后

// ViewController.m

// TestNameSortAndSplit

//

// Created by ethan on 17-6-14.

// Copyright (c) 2017年 jay. All rights reserved.

//

#import "ViewController.h"

#import "pinyin.h"

#import "ChineseString.h"

@interface ViewController ()

@end

@implementation ViewController

@synthesize dataArr = _dataArr;

@synthesize sortedArrForArrays = _sortedArrForArrays;

@synthesize sectionHeadsKeys = _sectionHeadsKeys;

- (void)viewDidLoad

{

[super viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

[self initData];

[self createTableView];

}

- (void)didReceiveMemoryWarning

{

[super didReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

- (void)dealloc {

[_dataArr release];

[_sortedArrForArrays release];

[_sectionHeadsKeys release];

[_tableView release];

[super dealloc];

}

#pragma mark -

#pragma mark create method

- (void)initData {

//init

_dataArr = [[NSMutableArray alloc] init];

_sortedArrForArrays = [[NSMutableArray alloc] init];

_sectionHeadsKeys = [[NSMutableArray alloc] init]; //initialize a array to hold keys like A,B,C ...

//add test data

[_dataArr addObject:@"郭靖"];

[_dataArr addObject:@"黄蓉"];

[_dataArr addObject:@"杨过"];

[_dataArr addObject:@"苗若兰"];

[_dataArr addObject:@"令狐冲"];

[_dataArr addObject:@"小龙女"];

[_dataArr addObject:@"胡斐"];

[_dataArr addObject:@"水笙"];

[_dataArr addObject:@"任盈盈"];

[_dataArr addObject:@"白琇"];

[_dataArr addObject:@"狄云"];

[_dataArr addObject:@"石破天"];

[_dataArr addObject:@"殷素素"];

[_dataArr addObject:@"张翠山"];

[_dataArr addObject:@"张无忌"];

[_dataArr addObject:@"青青"];

[_dataArr addObject:@"袁冠南"];

[_dataArr addObject:@"萧中慧"];

[_dataArr addObject:@"袁承志"];

[_dataArr addObject:@"乔峰"];

[_dataArr addObject:@"王语嫣"];

[_dataArr addObject:@"段玉"];

[_dataArr addObject:@"虚竹"];

[_dataArr addObject:@"苏星河"];

[_dataArr addObject:@"丁春秋"];

[_dataArr addObject:@"庄聚贤"];

[_dataArr addObject:@"azi"];

[_dataArr addObject:@"阿朱"];

[_dataArr addObject:@"阿碧"];

[_dataArr addObject:@"鸠魔智"];

[_dataArr addObject:@"萧远山"];

[_dataArr addObject:@"慕容复"];

[_dataArr addObject:@"慕容博"];

[_dataArr addObject:@"Jim"];

[_dataArr addObject:@"Lily"];

[_dataArr addObject:@"Ethan"];

[_dataArr addObject:@"Green小"];

[_dataArr addObject:@"Green大"];

[_dataArr addObject:@"DavidSmall"];

[_dataArr addObject:@"DavidBig"];

[_dataArr addObject:@"James"];

[_dataArr addObject:@"Kobe Brand"];

[_dataArr addObject:@"Kobe Crand"];

self.sortedArrForArrays = [self getChineseStringArr:_dataArr];

}

- (void)createTableView {

_tableView = [[UITableView alloc] initWithFrame:self.view.frame style:UITableViewStylePlain];

_tableView.dataSource = self;

_tableView.delegate = self;

[self.view addSubview:_tableView];

}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {

return [[self.sortedArrForArrays objectAtIndex:section] count];

}

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {

return [self.sortedArrForArrays count];

}

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section

{

return [_sectionHeadsKeys objectAtIndex:section];

}

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

return self.sectionHeadsKeys;

}

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

NSString *cellId = @"CellId";

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellId];

if (cell == nil) {

cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellId] autorelease];

}

if ([self.sortedArrForArrays count] > indexPath.section) {

NSArray *arr = [self.sortedArrForArrays objectAtIndex:indexPath.section];

if ([arr count] > indexPath.row) {

ChineseString *str = (ChineseString *) [arr objectAtIndex:indexPath.row];

cell.textLabel.text = str.string;

} else {

NSLog(@"arr out of range");

}

} else {

NSLog(@"sortedArrForArrays out of range");

}

return cell;

}

- (NSMutableArray *)getChineseStringArr:(NSMutableArray *)arrToSort {

NSMutableArray *chineseStringsArray = [NSMutableArray array];

for(int i = 0; i < [arrToSort count]; i++) {

ChineseString *chineseString=[[ChineseString alloc]init];

chineseString.string=[NSString stringWithString:[arrToSort objectAtIndex:i]];

if(chineseString.string==nil){

chineseString.string=@"";

}

if(![chineseString.string isEqualToString:@""]){

//join the pinYin

NSString *pinYinResult = [NSString string];

for(int j = 0;j < chineseString.string.length; j++) {

NSString *singlePinyinLetter = [[NSString stringWithFormat:@"%c",

pinyinFirstLetter([chineseString.string characterAtIndex:j])]uppercaseString];

pinYinResult = [pinYinResult stringByAppendingString:singlePinyinLetter];

}

chineseString.pinYin = pinYinResult;

} else {

chineseString.pinYin = @"";

}

[chineseStringsArray addObject:chineseString];

[chineseString release];

}

//sort the ChineseStringArr by pinYin

NSArray *sortDescriptors = [NSArray arrayWithObject:[NSSortDescriptor sortDescriptorWithKey:@"pinYin" ascending:YES]];

[chineseStringsArray sortUsingDescriptors:sortDescriptors];

NSMutableArray *arrayForArrays = [NSMutableArray array];

BOOL checkValueAtIndex= NO; //flag to check

NSMutableArray *TempArrForGrouping = nil;

for(int index = 0; index < [chineseStringsArray count]; index++)

{

ChineseString *chineseStr = (ChineseString *)[chineseStringsArray objectAtIndex:index];

NSMutableString *strchar= [NSMutableString stringWithString:chineseStr.pinYin];

NSString *sr= [strchar substringToIndex:1];

NSLog(@"%@",sr); //sr containing here the first character of each string

if(![_sectionHeadsKeys containsObject:[sr uppercaseString]])//here I'm checking whether the character already in the selection header keys or not

{

[_sectionHeadsKeys addObject:[sr uppercaseString]];

TempArrForGrouping = [[[NSMutableArray alloc] initWithObjects:nil] autorelease];

checkValueAtIndex = NO;

}

if([_sectionHeadsKeys containsObject:[sr uppercaseString]])

{

[TempArrForGrouping addObject:[chineseStringsArray objectAtIndex:index]];

if(checkValueAtIndex == NO)

{

[arrayForArrays addObject:TempArrForGrouping];

checkValueAtIndex = YES;

}

}

}

return arrayForArrays;

}

@end