一个简单的列表排序 还有模糊搜索

@interface SJZFriendListController ()<UITableViewDelegate,UITableViewDataSource,UISearchBarDelegate>
/**
 *  好友列表的tableView
 */
@property (nonatomic,strong) UITableView *tableView;
/**
 *  上面的搜索条
 */
@property (nonatomic,strong) UISearchBar *searchBar;
/**
 *  所有好友数组
 */
@property (nonatomic,strong) NSArray *allFirendDataArray;
@property (nonatomic,strong) NSMutableArray *allNewFirendDataArray;
/**
 *  所有名字字典
 */
@property (nonatomic,strong) NSMutableDictionary *allNameDictionary;
/**
 *  搜索结果的数组
 */
@property (nonatomic,strong) NSMutableArray *searchArr;//搜索到的内容

/**
 *  用户好友数组
 */
@property(nonatomic,strong) NSMutableArray   *useridArr;
/**
 *  记录多选选中的行
 */
@property (strong, nonatomic) NSMutableArray *selectIndexs;//多选选中的行
@end

@implementation SJZFriendListController

- (void)viewDidLoad {
    [super viewDidLoad];
      _selectIndexs = [[NSMutableArray alloc]init];
   [self setBaseVCAttributesWithTitle:nil left:@"fanhui.png" right:@"完成"];
    // self.useridArr =[[NSMutableArray alloc]init];
    _allNewFirendDataArray = [[NSMutableArray alloc] init];
    _searchArr = [[NSMutableArray alloc] init];
    _allNameDictionary = [[NSMutableDictionary alloc] init];

[self initSelfView];
[self getDataWithState:refreshForFirst];
}


#pragma mark - UISet  设置视图UI

- (void)initSelfView{
    
    //搜索按钮
    _searchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0, 64, SCREEN_WIDTH, 50)];
    _searchBar.delegate = self;
    _searchBar.placeholder = @"请输入好友中文名或者拼音";
    _searchBar.searchBarStyle = UISearchBarStyleDefault;
    _searchBar.barTintColor = RGBA(245, 245, 245, 1);
    //在键盘上部添加一个隐藏按钮
    UIView *inputView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 30)];
    inputView.backgroundColor = [UIColor colorWithWhite:0.8 alpha:1.0];
    UIButton *btn = [UIButton buttonWithType:UIButtonTypeSystem];
    btn.frame = CGRectMake(inputView.frame.size.width-50, 0, 50, inputView.frame.size.height);
    [btn setTitle:@"完成" forState:UIControlStateNormal];
    btn.titleLabel.font = [UIFont systemFontOfSize:16];
    [btn addTarget:self action:@selector(onHideKeyboard) forControlEvents:UIControlEventTouchUpInside];
    [inputView addSubview:btn];
    _searchBar.inputAccessoryView = inputView;
    [self.view addSubview:_searchBar];
    
    
    
    _tableView = [[UITableView alloc] initWithFrame:CGRectMake(0, 64 + 49, SCREEN_WIDTH, SCREEN_HEIGHT - 64 - 49) style:UITableViewStylePlain];
    _tableView.delegate = self;
    _tableView.dataSource = self;
    _tableView.sectionHeaderHeight = 20;
    _tableView.rowHeight = 50;
    _tableView.tableHeaderView =[[UIView alloc]init];
    _tableView.tableFooterView = [[UIView alloc]init];
    //    _tableView.separatorStyle = UITableViewCellSeparatorStyleNone;
    _tableView.sectionFooterHeight = 0.1;
   
    [_tableView registerClass:[MyFriendSelectTableViewCell class] forCellReuseIdentifier:@"selectFriend"];
     [self.view addSubview:_tableView];
}
-(NSMutableArray *)useridArr{
    if (nil==_useridArr) {
        _useridArr =[[NSMutableArray alloc]init];
        NSArray *arr = [NIMSDK sharedSDK].userManager.myFriends;
        for (NIMUser *user in arr) {
            [self.useridArr addObject:user.userId];
        }
    }
    return _useridArr;
}

#pragma mark - Http   网络请求方法

- (void)getDataWithState:(RefreshState)state{
     for (NSString *str in self.useridArr) {
        if (str.length > 0) {
            MyFriendModel *model = [[MyFriendModel alloc] init];
            model.name = str;
            //获取首字,uppercaseString是将首字母转换成大写
            model.namePinyin = [NSString chineseToPinyin:str];
            NSString *letterStr = [[model.namePinyin  substringWithRange:NSMakeRange(0, 1)] uppercaseString];
            model.nameLetter = letterStr;
            [_allNewFirendDataArray addObject:model];
            model.ifSelected =NO;
        }
        
    }
    //将首字母相同的放在一起
    [self getAllNames];
}

#pragma mark - 将首字母相同的放在一起
- (void)getAllNames
{
    //遍历
    for (MyFriendModel *model in _allNewFirendDataArray) {
        NSMutableArray *letterArr = _allNameDictionary[model.nameLetter];
        //判断数组里是否有元素，如果为nil，则实例化该数组，并在cityDict字典中插入一条新的数据
        if (letterArr == nil) {
            letterArr = [[NSMutableArray alloc] init];
            [_allNameDictionary setObject:letterArr forKey:model.nameLetter];
        }
        //将新数据放到数组里
        [letterArr addObject:model];
    }
}

#pragma mark - 获得所有的key值并排序，并返回排好序的数组
- (NSArray *)getCityDictAllKeys
{
    //获得cityDict字典里的所有key值，
    NSArray *keys = [_allNameDictionary allKeys];
    //打印
    //按升序进行排序（A B C D……）
    return [keys sortedArrayUsingSelector:@selector(compare:)];
}

#pragma mark - TableView    tableview相关delete和datasource

//引入索引的一个代理方法
- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView {
    NSArray *keys = [self getCityDictAllKeys];//获得所有的key值
    return keys;
}
//section上的标题（A B C D……Z）
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {
    NSArray *keys = [self getCityDictAllKeys];//获得所有的key值（A B C D……Z）
    return keys[section];
}
//section的个数
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
    NSArray *keys = [self getCityDictAllKeys];//获得所有的key值
    return keys.count;
}
//每个section对应的cell的个数
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
    NSArray *keys = [self getCityDictAllKeys];//获得所有的key值
    NSString *keyStr = keys[section];//（A B C D……Z）
    NSArray *array = [_allNameDictionary objectForKey:keyStr];//所有section下key值所对应的value的值
    return array.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
    MyFriendSelectTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"selectFriend" forIndexPath:indexPath];
    NSArray *keys = [self getCityDictAllKeys];//获得所有的key值
    NSString *keyStr = keys[indexPath.section];
    NSArray *array = [_allNameDictionary objectForKey:keyStr];//所有section下key值所对应的value的值,array就是value值，存放的是model模型
    MyFriendModel *model = [array objectAtIndex:indexPath.row];
        
    cell.headImageView.image = [UIImage imageNamed:@"headerImage.jpg"];
    cell.nameLabel.text = model.name;
    cell.selectionStyle = UITableViewCellSelectionStyleNone;
    //设置勾
//    cell.accessoryType = UITableViewCellAccessoryNone;
    cell.selectButton.selected = NO;
    for (NSIndexPath *index in _selectIndexs) {
        if (index == indexPath) { //改行在选择的数组里面有记录
            cell.selectButton.selected =YES; //打勾
            break;
        }
    }
    
    return cell;
       
}

//点击每个cell触发的事件
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    //cell的多选操作
    //获取到点击的cell
    MyFriendSelectTableViewCell *cell = (MyFriendSelectTableViewCell*)[tableView cellForRowAtIndexPath:indexPath];
    if (cell.selectButton.selected==YES) { //如果为选中状态
        cell.selectButton.selected=NO; //切换为未选中
        [_selectIndexs removeObject:indexPath]; //数据移除
    }else { //未选中
        cell.selectButton.selected=YES; //切换为选中
        [_selectIndexs addObject:indexPath]; //添加索引数据到数组
    }
    
//    MyFriendSelectTableViewCell *cell = (MyFriendSelectTableViewCell *)[tableView cellForRowAtIndexPath:indexPath];
//    cell.accessoryType = UITableViewCellAccessoryCheckmark;
//    FriendMessageViewController *message = [[FriendMessageViewController alloc]init];
//    NSArray *keys = [self getCityDictAllKeys];//获得所有的key值
//    NSString *keyStr = keys[indexPath.section];
//    NSArray *array = [_allNameDictionary objectForKey:keyStr];//所有section下key值所对应的value的值,array就是value值，存放的是model模型
//    MyFriendModel *model = [array objectAtIndex:indexPath.row];
//    message.userId = model.name;
//    [self.navigationController pushViewController:message animated:YES];
    
    //    FriendInfoViewController *vc = [[FriendInfoViewController alloc] init];
    //    [self.navigationController pushViewController:vc animated:YES];
    
}
#pragma mark - UISearchBar - delegate
- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText
{
    BOOL isSearch = YES;//有编辑内容时为YES
    if (searchText.length <= 0) {
        isSearch = NO;//被清空时为NO
    }
    NSString *searchStr = _searchBar.text;
    [_searchArr removeAllObjects];//清空searchDataArr，防止显示之前搜索的结果内容
    //把这个文本与数据源进行比较
    //把数据源中类似的数据取出，存入searchDataArr
    for (NSInteger i= 0;i < _allNewFirendDataArray.count; i ++){
        MyFriendModel *model = _allNewFirendDataArray[i];
        searchStr = [searchStr lowercaseString];//转换成小写
        BOOL isHas = [model.name hasPrefix:searchStr];//判断model.name是否以字符串searchStr开头
        if(isHas){
            [_searchArr addObject:model];
        }else{
            isHas = [model.namePinyin hasPrefix:searchStr];
            if (isHas) {
                [_searchArr addObject:model];
            }
        }
    }
    if (searchStr.length>0) {
        [_allNameDictionary removeAllObjects];
        //遍历
        for (MyFriendModel *model in _searchArr) {
            NSMutableArray *letterArr = _allNameDictionary[model.nameLetter];
            //判断数组里是否有元素，如果为nil，则实例化该数组，
            if (letterArr == nil) {
                letterArr = [[NSMutableArray alloc] init];
                [_allNameDictionary setObject:letterArr forKey:model.nameLetter];
            }
            [letterArr addObject:model];
        }
    }else{
        //遍历
        for (MyFriendModel *model in _allNewFirendDataArray) {
            NSMutableArray *letterArr = _allNameDictionary[model.nameLetter];
            //判断数组里是否有元素，如果为nil，则实例化该数组，
            if (letterArr == nil) {
                letterArr = [[NSMutableArray alloc] init];
                [_allNameDictionary setObject:letterArr forKey:model.nameLetter];
            }
            [letterArr addObject:model];
        }
    }
    [_tableView reloadData];
}

#pragma mark - ButtonAction     按钮事件

- (void)onHideKeyboard{
    [_searchBar resignFirstResponder];
}



- (void)leftSelectedEvent:(id)sender{
    [self.navigationController popViewControllerAnimated:YES];
}
- (void)rightSelectedEvent:(id)sender{
    //    [[NIMSDK sharedSDK].userManager deleteFriend:@"111111" completion:nil]; //删除好友
}