最近在做公司的聊天项目，项目中涉及到了对自己的联系人进行排序的功能，在网上查了下，大多说到了用苹果自带的UILocalizedIndexCollation这个类，试了下很简单，但是有个小问题，留在最后说，下面是大体的思路：

思路

#import "ViewController.h"
#import "QLContact.h"
@interface ViewController () <UITableViewDelegate, UITableViewDataSource>
@property (nonatomic, strong) NSMutableArray *contactArray;
@property (nonatomic, strong) NSMutableArray *sortedArray;
@property (nonatomic, strong) UILocalizedIndexedCollation *collation;
@end

@implementation ViewController

- (NSMutableArray *)contactArray {
    if (!_contactArray) {
        _contactArray = [NSMutableArray array];
        NSArray *firstNameArray = @[@"赵",@"钱",@"孙",@"李",@"周",@"吴",@"郑",@"王",@"冯",@"陈",@"楮",@"卫",@"蒋",@"沈",@"韩",@"杨",@"朱",@"秦",@"尤",@"许",@"何",@"吕",@"施",@"张",@"孔",@"曹",@"严",@"华",@"金",@"魏",@"陶",@"姜",@"戚",@"谢",@"邹",@"喻",@"柏",@"水",@"窦",@"章",@"云",@"苏",@"潘",@"葛",@"奚",@"范",@"彭",@"郎",@"鲁",@"韦",@"昌",@"马",@"苗",@"凤",@"花",@"方",@"俞",@"任",@"袁",@"柳",@"酆",@"鲍",@"史",@"唐",@"费",@"廉",@"岑",@"薛",@"雷",@"贺",@"倪",@"汤",@"滕",@"殷",@"罗",@"毕",@"郝",@"邬",@"安",@"常",@"乐",@"于",@"时",@"傅",@"皮",@"卞",@"齐",@"康",@"伍",@"余",@"元",@"卜",@"顾",@"孟",@"平",@"黄",@"和",@"穆",@"萧",@"尹",@"姚",@"邵",@"湛",@"汪",@"祁",@"毛",@"禹",@"狄",@"米",@"贝",@"明",@"臧",@"计",@"伏",@"成",@"戴",@"谈",@"宋",@"茅",@"庞",@"熊",@"纪",@"舒",@"屈",@"项",@"祝",@"董",@"梁",@"杜",@"阮",@"蓝",@"闽",@"席",@"季",@"麻",@"强",@"贾",@"路",@"娄",@"危",@"江",@"童",@"颜",@"郭",@"梅",@"盛",@"林",@"刁",@"锺",@"徐",@"丘",@"骆",@"高",@"夏",@"蔡",@"田",@"樊",@"胡",@"凌",@"霍",@"虞",@"万",@"支",@"柯",@"昝",@"管",@"卢",@"莫",@"经",@"房",@"裘",@"缪",@"干",@"解",@"应",@"宗",@"丁",@"宣",@"贲",@"邓",@"郁",@"单",@"杭",@"洪",@"包",@"诸",@"左",@"石",@"崔",@"吉",@"钮",@"龚",@"程",@"嵇",@"邢",@"滑",@"裴",@"陆",@"荣",@"翁",@"荀",@"羊",@"於",@"惠",@"甄",@"麹",@"家",@"封",@"芮",@"羿",@"储",@"靳",@"汲",@"邴",@"糜",@"松",@"井",@"段",@"富",@"巫",@"乌",@"焦",@"巴",@"弓",@"牧",@"隗",@"山",@"谷",@"车",@"侯",@"宓",@"蓬",@"全",@"郗",@"班",@"仰",@"秋",@"仲",@"伊",@"宫",@"宁",@"仇",@"栾",@"暴",@"甘",@"斜",@"厉",@"戎",@"祖",@"武",@"符",@"刘",@"景",@"詹",@"束",@"龙",@"叶",@"幸",@"司",@"韶",@"郜",@"黎",@"蓟",@"薄",@"印",@"宿",@"白",@"怀",@"蒲",@"邰",@"从",@"鄂",@"索",@"咸",@"籍",@"赖",@"卓",@"蔺",@"屠",@"蒙",@"池",@"乔",@"阴",@"郁",@"胥",@"能",@"苍",@"双",@"闻",@"莘",@"党",@"翟",@"谭",@"贡",@"劳",@"逄",@"姬",@"申",@"扶",@"堵",@"冉",@"宰",@"郦",@"雍",@"郤",@"璩",@"桑",@"桂",@"濮",@"牛",@"寿",@"通",@"边",@"扈",@"燕",@"冀",@"郏",@"浦",@"尚",@"农",@"温",@"别",@"庄",@"晏",@"柴",@"瞿",@"阎",@"充",@"慕",@"连",@"茹",@"习",@"宦",@"艾",@"鱼",@"容",@"向",@"古",@"易",@"慎",@"戈",@"廖",@"庾",@"终",@"暨",@"居",@"衡",@"步",@"都",@"耿",@"满",@"弘",@"匡",@"国",@"文",@"寇",@"广",@"禄",@"阙",@"东",@"欧",@"殳",@"沃",@"利",@"蔚",@"越",@"夔",@"隆",@"师",@"巩",@"厍",@"聂",@"晁",@"勾",@"敖",@"融",@"冷",@"訾",@"辛",@"阚",@"那",@"简",@"饶",@"空",@"曾",@"毋",@"沙",@"乜",@"养",@"鞠",@"须",@"丰",@"巢",@"关",@"蒯",@"相",@"查",@"后",@"荆",@"红",@"游",@"竺",@"权",@"逑",@"盖",@"益",@"桓",@"公",@"万俟",@"司马",@"上官",@"欧阳",@"夏侯",@"诸葛",@"闻人",@"东方",@"赫连",@"皇甫",@"尉迟",@"公羊",@"澹台",@"公冶",@"宗政",@"濮阳",@"淳于",@"单于",@"太叔",@"申屠",@"公孙",@"仲孙",@"轩辕",@"令狐",@"锺离",@"宇文",@"长孙",@"慕容",@"鲜于",@"闾丘",@"司徒",@"司空",@"丌官",@"司寇",@"仉",@"督",@"子车",@"颛孙",@"端木",@"巫马",@"公西",@"漆雕",@"乐正",@"壤驷",@"公良",@"拓拔",@"夹谷",@"宰父",@"谷梁",@"晋",@"楚",@"阎",@"法",@"汝",@"鄢",@"涂",@"钦",@"段干",@"百里",@"东郭",@"南门",@"呼延",@"归",@"海",@"羊舌",@"微生",@"岳",@"帅",@"缑",@"亢",@"况",@"后",@"有",@"琴",@"梁丘",@"左丘",@"东门",@"西门",@"商",@"牟",@"佘",@"佴",@"伯",@"赏",@"南宫",@"墨",@"哈",@"谯",@"笪",@"年",@"爱",@"阳",@"佟"];
        NSArray *secondNameArray = @[@"比",@"斯",@"灵",@"罗",@"里",@"佳",@"桐"];
        
        for (NSString *firstName in firstNameArray) {
            for (NSString *secondName in secondNameArray) {
                QLContact *contact = [[QLContact alloc] init];
                contact.name = [firstName stringByAppendingString:secondName];
                [_contactArray addObject:contact];
            }
        }
    }
    return _contactArray;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    
    self.sortedArray = [NSMutableArray array];
    
    self.collation = [UILocalizedIndexedCollation currentCollation];
    
    [self.tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"cell"];
    
    //创建存放相同首字母名字对象的数组
    for (int i = 0; i < self.collation.sectionTitles.count; i++) {
        NSMutableArray *mutArray = [NSMutableArray array];
        [self.sortedArray addObject:mutArray];
    }
    
    //把各个联系人对象取出来，放到对应的数组中
    for (QLContact *contact in self.contactArray) {
        NSInteger position = [self.collation sectionForObject:contact collationStringSelector:@selector(name)];
        [self.sortedArray[position] addObject:contact];
    }
    
    //再把存放着各个相同首字母名字对象的数组取出来，将其中的联系人对象按照名称进行排序
    [self.sortedArray enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
        NSArray *array = [self.collation sortedArrayFromArray:obj collationStringSelector:@selector(name)];
        self.sortedArray[idx] = array;
    }];
    
}

#pragma mark - UITableViewDataSource
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    return self.collation.sectionTitles.count;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return [self.sortedArray[section] count];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell"];
    QLContact *contact = self.sortedArray[indexPath.section][indexPath.row];
    cell.textLabel.text = contact.name;
    return cell;
}

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {
    if ([self.sortedArray[section] count]) {
        return self.collation.sectionTitles[section];
    } else {
        return nil;
    }
}

- (NSArray<NSString *> *)sectionIndexTitlesForTableView:(UITableView *)tableView {
    return self.collation.sectionTitles;
}

@end

其中，QLContact是存储联系人信息的模型，有name这个属性。
运行的结果如下：

运行结果

如GIF所示，存在的问题是当首字母出现同音字时，是按照名字的拼音顺序排列，而不是按照同一个姓排在一起的规则排列

存在的问题

这个问题暂且搁在这里，有更好的方法后再来修改。