新建继承NSObject的文件，取名为LinkManSort
LinkManSort.m文件
#import "LinkManSort.h"
staticNSString*constCYPinyinGroupResultArray =@"CYPinyinGroupResultArray";
staticNSString*constCYPinyinGroupCharArray =@"CYPinyinGroupCharArray";
@implementation LinkManSort
// 按首字母分组排序数组
+ (NSDictionary *)sortObjectsAccordingToInitialWith:(NSArray *)willSortArr SortKey:(NSString *)sortkey {
// 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#）
NSIntegersectionTitlesCount = [[collationsectionTitles]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 = [[NSMutableArrayalloc]initWithCapacity:sectionTitlesCount];
//初始化27个空数组加入newSectionsArray
for(NSIntegerindex =0; index < sectionTitlesCount; index++) {
NSMutableArray *array = [[NSMutableArray alloc] init];
[newSectionsArrayaddObject:array];
}
NSLog(@"newSectionsArray %@ %@",newSectionsArray,collation.sectionTitles);
NSMutableArray *firstChar = [NSMutableArray arrayWithCapacity:10];
//将每个名字分到某个section下
for(idModelinwillSortArr) {
//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];
[sectionNamesaddObject:Model];
//拿出每名字的首字母
NSString* str= collation.sectionTitles[sectionNumber];
[firstCharaddObject:str];
NSLog(@"sectionNumbersectionNumber %ld %@",sectionNumber,str);
}
//返回首字母排好序的数据
NSArray*firstCharResult = [selfSortFirstChar:firstChar];
NSLog(@"firstCharResult== %@",firstCharResult);
//对每个section中的数组按照name属性排序
for(NSIntegerindex =0; index < sectionTitlesCount; index++) {
NSMutableArray*personArrayForSection = newSectionsArray[index];
NSArray*sortedPersonArrayForSection = [collationsortedArrayFromArray:personArrayForSectioncollationStringSelector:@selector(name)];
newSectionsArray[index] = sortedPersonArrayForSection;
}
//删除空的数组
NSMutableArray *finalArr = [NSMutableArray new];
for(NSIntegerindex =0; index < sectionTitlesCount; index++) {
if(((NSMutableArray*)(newSectionsArray[index])).count!=0) {
[finalArraddObject:newSectionsArray[index]];
}
}
return @{CYPinyinGroupResultArray:finalArr,CYPinyinGroupCharArray:firstCharResult};
}
+ (NSArray*)SortFirstChar:(NSArray*)firstChararry
{
//数组去重复
NSMutableArray *noRepeat = [[NSMutableArray alloc]initWithCapacity:8];
NSMutableSet*set = [[NSMutableSetalloc]initWithArray:firstChararry];
[setenumerateObjectsUsingBlock:^(idobj ,BOOL*stop){
[noRepeataddObject:obj];
}];
//字母排序
NSArray*resultkArrSort1 = [noRepeatsortedArrayUsingComparator:^NSComparisonResult(idobj1,idobj2) {
return [obj1 compare:obj2 options:NSNumericSearch];
}];
//把”#“放在最后一位
NSMutableArray*resultkArrSort2 = [[NSMutableArrayalloc]initWithArray:resultkArrSort1];
if([resultkArrSort2containsObject:@"#"]) {
[resultkArrSort2removeObject:@"#"];
[resultkArrSort2addObject:@"#"];
}
returnresultkArrSort2;
}
@end
LinkManSort.h文件
重点是，记得要引入UIKit头文件 #import <UIKit/UIKit.h>
不然UILocalizedIndexedCollation会报错
+ (NSDictionary *)sortObjectsAccordingToInitialWith:(NSArray *)willSortArr SortKey:(NSString *)sortkey;
创建model
-----PersonModel.h
NS_ASSUME_NONNULL_BEGIN
@interface PersonModel : NSObject
@property(nonatomic, strong) NSString *name;
- (instancetype)initWithName:(NSString*)name;
@end
-----PersonModel.m
#import "PersonModel.h"
@implementation PersonModel
- (instancetype)initWithName:(NSString*)name {
if(self= [superinit]) {
self.name= name;
}
return self;
}
@end
调用方法，引入头文件#import "LinkManSort.h"
#import "ViewController.h"
#import "PersonModel.h"
#import "LinkManSort.h"
staticNSString*constCYPinyinGroupResultArray =@"CYPinyinGroupResultArray";
staticNSString*constCYPinyinGroupCharArray =@"CYPinyinGroupCharArray";
@interface ViewController ()<UITableViewDelegate,UITableViewDataSource>
@property(nonatomic,strong)NSArray *dataSource;
@property(nonatomic,strong)UILocalizedIndexedCollation *collation;
@property(nonatomic,strong)UITableView *tableView;
@property(nonatomic,strong)NSMutableArray *sectionArr;//分区数组
@property(nonatomic,strong)NSMutableArray *indexArr;//索引数组
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
self.sectionArr = [NSMutableArray array];
[self.view addSubview:self.tableView];
[selfloadData];
}
#pragma mark - UITableViewDataSource
- (NSString*)tableView:(UITableView*)tableViewtitleForHeaderInSection:(NSInteger)section {
returnself.indexArr[section];
}
- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView {
return [self.collation sectionIndexTitles];
}
//索引列点击事件
- (NSInteger)tableView:(UITableView *)tableView sectionForSectionIndexTitle:(NSString *)title atIndex:(NSInteger)index {
return [self.collation sectionForSectionIndexTitleAtIndex:index];
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return self.indexArr.count;
}
- (NSInteger)tableView:(UITableView*)tableViewnumberOfRowsInSection:(NSInteger)section {
return[self.dataSource[section]count];
}
- (UITableViewCell*)tableView:(UITableView*)tableViewcellForRowAtIndexPath:(NSIndexPath*)indexPath {
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:NSStringFromClass([UITableViewCell class]) forIndexPath:indexPath];
PersonModel*person = [self.dataSource[indexPath.section]objectAtIndex:indexPath.row];
cell.textLabel.text= person.name;
returncell;
}
- (UITableView *)tableView {
if(_tableView==nil) {
_tableView = [[UITableView alloc] initWithFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height) style:UITableViewStylePlain];
_tableView.delegate=self;
_tableView.backgroundColor = [UIColor lightGrayColor];
_tableView.dataSource=self;
[_tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:NSStringFromClass([UITableViewCell class])];
}
return _tableView;
}
//数据源
- (void)loadData {
NSArray *testArr = @[@"杨幂",@"李易峰",@"王祖蓝", @"垃圾", @"苏有朋", @"大海", @"佟丽娅", @"霍建华", @"薛之谦", @"周笔畅", @"李宇春", @"张靓颖", @"阿里郎", @"胡一天", @"贾乃亮", @"罗晋",@"~~肉肉~~"];
NSMutableArray*personArr = [NSMutableArrayarrayWithCapacity:testArr.count];
for(NSString*strintestArr) {
//排序str
PersonModel*person = [[PersonModelalloc]initWithName:str];
[personArraddObject:person];
}
NSDictionary *dcit= [LinkManSort sortObjectsAccordingToInitialWith:personArr SortKey:@"name"];
self.dataSource = dcit[CYPinyinGroupResultArray];//排好顺序的PersonModel数组
self.indexArr = dcit[CYPinyinGroupCharArray];//排好顺序的首字母数组
self.collation = [UILocalizedIndexedCollation currentCollation];
}
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