UILocalizedIndexedCollation 的浅分析

这篇文章是我在看过其英文档后写得。。。。

UILocalizedIndexedCollation 是相当于是tableView的一个辅助类，用来对tableView的数据源进行管理，排序，定位。 UILoaclizedIndexedCollation 提供了对tableView的section titles 和section index titles的配置。带有section index的tableView，主要是应用于很多个分类的数据项，例如电话本，联系人的姓的首字母相同时会分在一个组下面，当联系人很多的时候，要寻找一个人就很麻烦了，这个时候边搜索的优势就体现出来了，当你点击section index 中得一个title，它就会跳到跟这个section index对应的section处。

现在我们要为tableView有个section index做准备。

1.首先创建一个UILocalizedIndexedCollation对象，它是个shared instance，所以使用

    UILocalizedIndexedCollation *theCollation = [UILocalizedIndexedCollation currentCollation];

2.使用创建的theCollation调用sectionForObject:collationStringSelector：这个方法决定了每个对象属于哪个section，并返回一个NSInteger值来标识这个section

for (AddressBookEntity *addressBook in addressBookTemp) {
        NSInteger sect = [theCollation sectionForObject:addressBook
                                collationStringSelector:@selector(getFirstName)];
        addressBook.sectionNumber = sect;//记录下对象的section id
    }

其中决定对象属于哪个section是由getFirstName方法来决定的，这个方法是由自己实现的，后面我会贴出它的实现代码。当我们得到对象的section id时，我们最好记录下来，供后面获取到整个section，从而对seciton内的数据进行排序。

3.创建存储所有section的array，以及为每个section分配它的存储空间，初始空间为1。

NSInteger highSection = [[theCollation sectionTitles] count];
    NSMutableArray *sectionArrays = [NSMutableArray arrayWithCapacity:highSection];
    for (int i=0; i<=highSection; i++) {
        NSMutableArray *sectionArray = [NSMutableArray arrayWithCapacity:1];
        [sectionArrays addObject:sectionArray];
    }

利用数据源来填充每个section ，根据对象的section id 把每个对象放入其对应的section array里

    for (AddressBookEntity *addressBook in addressBookTemp) {
        [(NSMutableArray *)[sectionArrays objectAtIndex:addressBook.sectionNumber] addObject:addressBook];
    }

                4.用theCollation调用 sortedArrayFromArray:collationStringSelector:  这个方法对每个section里面的数据进行排序，然后返回一个已经排好序的array,将其添加到一个全局变量listContent中。

for (NSMutableArray *sectionArray in sectionArrays) {
        NSArray *sortedSection = [theCollation sortedArrayFromArray:sectionArray collationStringSelector:@selector(getFirstName)];
        [listContent addObject:sortedSection];
    }

至此为止，我们就已经将tableView的数据源进行了分组，确定了每个对象所在的section，以及每个section下得所有对象的排序，这个功能可以很方便的对tableView的数据进行排序，可以作为一个单独的功能来使用。我不实现

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

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

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

这个三个代理方法就不会显示section和section index，但是我显示的数据就全是排好序的。很方便的

当然如果你想显示section和section index，就需要实现上面的这个三个方法，这三个方法可以直接用UILocalizedIndexedCollation来实现，如下：

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
    return [[[UILocalizedIndexedCollation currentCollation] sectionTitles] objectAtIndex:section];
}
 
- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView
{
    return [[UILocalizedIndexedCollation currentCollation] sectionIndexTitles];
}
 //返回section index对应的section
- (NSInteger)tableView:(UITableView *)tableView sectionForSectionIndexTitle:(NSString *)title atIndex:(NSInteger)index
{
    return [[UILocalizedIndexedCollation currentCollation] sectionForSectionIndexTitleAtIndex:index];
}

note：section title 和section index title 是可以不相同的。

这是我第一次写这种文章，肯定有很多说得不太得当的地方，请多谅解，多谢多谢。

以下是getFirstName的具体内容，我觉得比较实用。

#import "AddressBookEntity.h"

@implementation AddressBookEntity
@synthesize name,telArray,sectionNumber;

#define HANZI_START 19968
#define HANZI_COUNT 20902
static char firstLetterArray[HANZI_COUNT] =
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"xy";

char pinyinFirstLetter(unsigned short hanzi)
{
    int index = hanzi - HANZI_START;
    if (index >= 0 && index <= HANZI_COUNT)
    {
        return firstLetterArray[index];
    }
    else
    {
        return '#';
    }
}
- (void)dealloc
{
    [name release];
    [telArray release];
    [super dealloc];
}
- (NSString *) getFirstName {
    if ([name canBeConvertedToEncoding: NSASCIIStringEncoding]) {//如果是英语
        return name;
    }
    else { //如果是非英语
        return [NSString stringWithFormat:@"%c",pinyinFirstLetter([name characterAtIndex:0])];
    }
    
}
@end