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【ObjC】 iOS索引搜索核心代码
作者:shanxi_liyong / 发布于2015/11/12/ 1479

	/************************************************************
	 * * EaseMob CONFIDENTIAL
	 * __________________
	 * Copyright (C) 2013-2014 EaseMob Technologies. All rights reserved.
	 *
	 * NOTICE: All information contained herein is, and remains
	 * the property of EaseMob Technologies.
	 * Dissemination of this information or reproduction of this material
	 * is strictly forbidden unless prior written permission is obtained
	 * from EaseMob Technologies.
	 */
	
	#import <UIKit/UIKit.h>
	
	@interface ChineseToPinyin : NSObject {
	
	}
	
	+ (NSString *) pinyinFromChineseString:(NSString *)string;
	+ (char) sortSectionTitle:(NSString *)string;
	
	@end

	

	

	

	

	#import "ViewController.h"
	#import "ChineseToPinyin.h"
	@interface ViewController ()
	{
	 NSMutableArray *sectionTitleArray;
	 NSMutableArray *groupListDataSource;
	}
	@end
	
	@implementation ViewController
	
	- (void)viewDidLoad {
	 [super viewDidLoad];
	 sectionTitleArray = [[NSMutableArray alloc]init];
	 groupListDataSource = [[NSMutableArray alloc]init];
	 [sectionTitleArray addObject:@"q"];
	 NSArray *array = @[@"a",@"b",@"c",@"d",@"e",@"f",@"g"];
	 [self sortDataArray:array];
	
	
	}
	- (void)sortDataArray:(NSArray *)dataArray
	{
	 //建立索引的核心
	 UILocalizedIndexedCollation *indexCollation = [UILocalizedIndexedCollation currentCollation];
	
	 NSArray *sectionTitles = [NSArray arrayWithArray:[indexCollation sectionTitles]];
	
	 //返回27，是a－z和＃
	 NSInteger highSection = [sectionTitles count];
	 //tableView 会被分成27个section
	 NSMutableArray *sortedArray = [NSMutableArray arrayWithCapacity:highSection];
	 for (int i = 0; i <= highSection; i++) {
	 NSMutableArray *sectionArray = [NSMutableArray arrayWithCapacity:1];
	 [sortedArray addObject:sectionArray];
	 }
	
	 //名字分section
	 for (NSString *model in dataArray) {
	 //getUserName是实现中文拼音检索的核心，见NameIndex类
	 NSString *firstLetter = [ChineseToPinyin pinyinFromChineseString:model];
	 NSInteger section = [indexCollation sectionForObject:[firstLetter substringToIndex:1] collationStringSelector:@selector(uppercaseString)];
	
	 NSMutableArray *array = [sortedArray objectAtIndex:section];
	 [array addObject:model];
	 }
	
	 //每个section内的数组排序
	 for (int i = 0; i < [sortedArray count]; i++) {
	 NSArray *array = [[sortedArray objectAtIndex:i] sortedArrayUsingComparator:^NSComparisonResult(NSString *obj1, NSString *obj2) {
	 NSString *firstLetter1 = [ChineseToPinyin pinyinFromChineseString:obj1];
	 firstLetter1 = [[firstLetter1 substringToIndex:1] uppercaseString];
	
	 NSString *firstLetter2 = [ChineseToPinyin pinyinFromChineseString:obj2];
	 firstLetter2 = [[firstLetter2 substringToIndex:1] uppercaseString];
	
	 return [firstLetter1 caseInsensitiveCompare:firstLetter2];
	 }];
	 [sortedArray replaceObjectAtIndex:i withObject:[NSMutableArray arrayWithArray:array]];
	 }
	
	 for (int i = 0; i < [sectionTitles count]; i++) {
	 if ([[sortedArray objectAtIndex:i] count] > 0) {
	 NSLog(@"%@",[sectionTitles objectAtIndex:i]);
	 [sectionTitleArray addObject:[sectionTitles objectAtIndex:i]];
	 [groupListDataSource addObject:[sortedArray objectAtIndex:i]];
	 }
	 }
	}
	
	- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView
	{
	 return sectionTitleArray;
	}
	#pragma mark - UITableViewDataSource
	-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
	{
	 return groupListDataSource.count;
	}
	
	-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
	{
	 return [[groupListDataSource objectAtIndex:section] count];
	}
	- (void)didReceiveMemoryWarning {
	 [super didReceiveMemoryWarning];
	 // Dispose of any resources that can be recreated.
	}
	
	@end
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