iOS实现联系人按照首字母进行排序的实例

// 初始化UILocalizedIndexedCollation
UILocalizedIndexedCollation *collation = [UILocalizedIndexedCollation currentCollation];
//得出collation索引的数量，这里是27个（26个字母和1个#）
NSInteger sectionTitlesCount = [[collation sectionTitles] count];
//初始化一个数组newSectionsArray用来存放最终的数据，我们最终要得到的数据模型应该形如@[@[以A开头的数据数组], @[以B开头的数据数组], @[以C开头的数据数组], ... @[以#(其它)开头的数据数组]]
NSMutableArray *newSectionsArray = [[NSMutableArray alloc] initWithCapacity:sectionTitlesCount];
//初始化27个空数组加入newSectionsArray
for (NSInteger index = 0; index < sectionTitlesCount; index++) {
 NSMutableArray *array = [[NSMutableArray alloc] init];
 [newSectionsArray addObject:array];
}
NSLog(@"newSectionsArray %@ %@",newSectionsArray,collation.sectionTitles);
NSMutableArray *firstChar = [NSMutableArray arrayWithCapacity:10];
//将每个名字分到某个section下
for (id Model in willSortArr) {
 //获取name属性的值所在的位置，比如"林丹"，首字母是L，在A~Z中排第11（第一位是0），sectionNumber就为11
 NSInteger sectionNumber = [collation sectionForObject:Model collationStringSelector:NSSelectorFromString(sortkey)];
 //把name为“林丹”的p加入newSectionsArray中的第11个数组中去
 NSMutableArray *sectionNames = newSectionsArray[sectionNumber];
 [sectionNames addObject:Model];
 NSString * str= collation.sectionTitles[sectionNumber];
 [firstChar addObject:str];
 NSLog(@"sectionNumbersectionNumber %ld %@",sectionNumber,str);
}
NSArray *firstCharResult = [self SortFirstChar:firstChar];

NSLog(@"firstCharResult== %@",firstCharResult);
//对每个section中的数组按照name属性排序
for (NSInteger index = 0; index < sectionTitlesCount; index++) {
 NSMutableArray *personArrayForSection = newSectionsArray[index];
 NSArray *sortedPersonArrayForSection = [collation sortedArrayFromArray:personArrayForSection collationStringSelector:@selector(name)];
 newSectionsArray[index] = sortedPersonArrayForSection;
}
//删除空的数组
NSMutableArray *finalArr = [NSMutableArray new];
for (NSInteger index = 0; index < sectionTitlesCount; index++) {
 if (((NSMutableArray *)(newSectionsArray[index])).count != 0) {
  [finalArr addObject:newSectionsArray[index]];
 }
}
return @{CYPinyinGroupResultArray:finalArr,
   CYPinyinGroupCharArray:firstCharResult};

//数组去重复
NSMutableArray *noRepeat = [[NSMutableArray alloc]initWithCapacity:8];
NSMutableSet *set = [[NSMutableSet alloc]initWithArray:firstChararry];
[set enumerateObjectsUsingBlock:^(id obj , BOOL *stop){

 [noRepeat addObject:obj];
}];
//字母排序
NSArray *resultkArrSort1 = [noRepeat sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {
 return [obj1 compare:obj2 options:NSNumericSearch];
}];
//把”#“放在最后一位
NSMutableArray *resultkArrSort2 = [[NSMutableArray alloc]initWithArray:resultkArrSort1];
if ([resultkArrSort2 containsObject:@"#"]) {
 [resultkArrSort2 removeObject:@"#"];
 [resultkArrSort2 addObject:@"#"];
}

return resultkArrSort2;

NSMutableArray *marr = [NSMutableArray arrayWithCapacity:10];
for (NSDictionary *dict in arr) {
 PersonModel *model =[[PersonModel alloc]init];// dict[@"name"];
 model.name =dict[@"name"];
 [marr addObject:model];

}

NSArray *resultarr1 = dcit[CYPinyinGroupResultArray];//排好顺序的PersonModel数组
NSArray *resultarr2 = dcit[CYPinyinGroupCharArray];//排好顺序的首字母数组