UILocalizedIndexedCollation

#pragma mark -------配置分组信息------

#define NEW_USER(str) [[User alloc] init:str name:str]

//配置分组信息

- (void)configureSections {

     

    //初始化测试数据

    userArray = [[NSMutableArrayalloc] init];

     

    [userArray addObject:NEW_USER(@"test001")];

    [userArray addObject:NEW_USER(@"test002")];

    [userArray addObject:NEW_USER(@"test003")];

    [userArray addObject:NEW_USER(@"test004")];

    [userArray addObject:NEW_USER(@"test005")];

     

    [userArray addObject:NEW_USER(@"adam01")];

    [userArray addObject:NEW_USER(@"adam02")];

    [userArray addObject:NEW_USER(@"adam03")];

     

    [userArray addObject:NEW_USER(@"bobm01")];

    [userArray addObject:NEW_USER(@"bobm02")];

     

    [userArray addObject:NEW_USER(@"what01")];

    [userArray addObject:NEW_USER(@"0what02")];

     

    [userArray addObject:NEW_USER(@"李一")];

    [userArray addObject:NEW_USER(@"李二")];

     

    [userArray addObject:NEW_USER(@"胡一")];

    [userArray addObject:NEW_USER(@"胡二")];

     

    //获得当前UILocalizedIndexedCollation对象并且引用赋给collation,A-Z的数据

    self.collation = [UILocalizedIndexedCollationcurrentCollation];

    //获得索引数和section标题数

    NSIntegerindex, sectionTitlesCount = [[collation sectionTitles] count];

     

    //临时数据，存放section对应的userObjs数组数据

    NSMutableArray*newSectionsArray = [[NSMutableArrayalloc] initWithCapacity:sectionTitlesCount];

     

    //设置sections数组初始化：元素包含userObjs数据的空数据

    for(index = 0; index < sectionTitlesCount; index++) {

        NSMutableArray*array = [[NSMutableArrayalloc] init];

        [newSectionsArray addObject:array];

    }

     

    //将用户数据进行分类，存储到对应的sesion数组中

    for(User *userObj in userArray) {

         

        //根据timezone的localename，获得对应的的section number

        NSIntegersectionNumber = [collation sectionForObject:userObj collationStringSelector:@selector(username)];

         

        //获得section的数组

        NSMutableArray*sectionUserObjs = [newSectionsArray objectAtIndex:sectionNumber];

         

        //添加内容到section中

        [sectionUserObjs addObject:userObj];

    }

     

    //排序，对每个已经分类的数组中的数据进行排序，如果仅仅只是分类的话可以不用这步

    for(index = 0; index < sectionTitlesCount; index++) {

         

        NSMutableArray*userObjsArrayForSection = [newSectionsArray objectAtIndex:index];

         

        //获得排序结果

        NSArray*sortedUserObjsArrayForSection = [collation sortedArrayFromArray:userObjsArrayForSection collationStringSelector:@selector(username)];

         

        //替换原来数组

        [newSectionsArray replaceObjectAtIndex:index withObject:sortedUserObjsArrayForSection];

    }

     

    self.sectionsArray = newSectionsArray;

}

#pragma mark --------tableview的委托和datasource-------

//设置Section的数

- (NSInteger)numberOfSectionsInTableView:(UITableView*)tableView {

    // The number of sections is the same as the number of titles in the collation.

    return[[collation sectionTitles] count];

}

//设置每个Section下面的cell数

- (NSInteger)tableView:(UITableView*)tableView numberOfRowsInSection:(NSInteger)section {

     

    // The number of time zones in the section is the count of the array associated with the section in the sections array.

    NSArray*UserObjsInSection = [sectionsArray objectAtIndex:section];

     

    return[UserObjsInSection count];

}

//设置每行的cell的内容

- (UITableViewCell*)tableView:(UITableView*)tableView cellForRowAtIndexPath:(NSIndexPath*)indexPath {

     

    staticNSString *CellIdentifier = @"Cell";

     

    UITableViewCell*cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if(cell == nil) {

        cell = [[UITableViewCellalloc] initWithStyle:UITableViewCellStyleDefaultreuseIdentifier:CellIdentifier];

    }

     

    // Get the time zone from the array associated with the section index in the sections array.

    NSArray*userNameInSection = [sectionsArray objectAtIndex:indexPath.section];

     

    // Configure the cell with the time zone's name.

    User *userObj = [userNameInSection objectAtIndex:indexPath.row];

    cell.textLabel.text = userObj.username;

     

    returncell;

}

- (void)tableView:(UITableView*)tableView didSelectRowAtIndexPath:(NSIndexPath*)indexPath {

    [tableView deselectRowAtIndexPath:indexPath animated:YES];

}

/*

 * 跟section有关的设定

 */

//设置section的Header

- (NSString*)tableView:(UITableView*)tableView titleForHeaderInSection:(NSInteger)section {

    NSArray*UserObjsInSection = [sectionsArray objectAtIndex:section];

    if(UserObjsInSection ==nil || [UserObjsInSection count] <= 0) {

        returnnil;

    }

    return[[collation sectionTitles] objectAtIndex:section];

}

//设置索引标题

- (NSArray*)sectionIndexTitlesForTableView:(UITableView*)tableView {

    return[collation sectionIndexTitles];

}

//关联搜索

- (NSInteger)tableView:(UITableView*)tableView sectionForSectionIndexTitle:(NSString*)title atIndex:(NSInteger)index {

    return[collation sectionForSectionIndexTitleAtIndex:index];

}