iOS实现联系人按照首字母进行排序的实例

// 初始化UILocalizedIndexedCollationUILocalizedIndexedCollation *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newSectionsArrayfor (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