UILocalizedIndexedCollation简介 - CSDN博客
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&=&//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&=highS&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)&&
-&(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,sectionN&&&&#define&HANZI_START&19968&&#define&HANZI_COUNT&20902&&static&char&firstLetterArray[HANZI_COUNT]&=&&&ydkqsxnwzssxjbymgcczqpssqbycdscdqldylybssjgyqzjjfgcclzznwdwzjljpfyynnjjtmynzwzhflzppqhgccyynmjqyxxgd&&&&nnsnsjnjnsnnmlnrxyfsngnnnnqzggllyjlnyzssecykyyhqwjssggyxyqyjtwktjhychmnxjtlhjyqbyxdldwrrjnwysrldzjpc&&&&bzjjbrcfslnczstzfxxchtrqggddlyccssymmrjcyqzpwwjjyfcrwfdfzqpyddwyxkyjawjffxjbcftzyhhycyswccyxsclcxxwz&&&&cxnbgnnxbxlzsqsbsjpysazdhmdzbqbscwdzzyytzhbtsyyfzgntnxjywqnknphhlxgybfmjnbjhhgqtjcysxstkzglyckglysmz&&&&xyalmeldccxgzyrjxjzlnjzcqkcnnjwhjczccqljststbnhbtyxceqxkkwjyflzqlyhjxspsfxlmpbysxxxytccnylllsjxfhjxp&&&&jbtffyabyxbcczbzyclwlczggbtssmdtjcxpthyqtgjjxcjfzkjzjqnlzwlslhdzbwjncjzyzsqnycqynzcjjwybrtwpyftwexcs&&&&kdzctbyhyzqyyjxzcfbzzmjyxxsdczottbzljwfckscsxfyrlrygmbdthjxsqjccsbxyytswfbjdztnbcnzlcyzzpsacyzzsqqcs&&&&hzqydxlbpjllmqxqydzxsqjtzpxlcglqdcwzfhctdjjsfxjejjtlbgxsxjmyjjqpfzasyjnsydjxkjcdjsznbartcclnjqmwnqnc&&&&lllkbdbzzsyhqcltwlccrshllzntylnewyzyxczxxgdkdmtcedejtsyyssdqdfmxdbjlkrwnqlybglxnlgtgxbqjdznyjsjyjcjm&&&&rnymgrcjczgjmzmgxmmryxkjnymsgmzzymknfxmbdtgfbhcjhkylpfmdxlxjjsmsqgzsjlqdldgjycalcmzcsdjllnxdjffffjcn&&&&fnnffpfkhkgdpqxktacjdhhzdddrrcfqyjkqccwjdxhwjlyllzgcfcqjsmlzpbjjblsbcjggdckkdezsqcckjgcgkdjtjllzycxk&&&&lqccgjcltfpcqczgwbjdqyzjjbyjhsjddwgfsjgzkcjctllfspkjgqjhzzljplgjgjjthjjyjzccmlzlyqbgjwmljkxzdznjqsyz&&&&mljlljkywxmkjlhskjhbmclyymkxjqlbmllkmdxxkwyxwslmlpsjqqjqxyqfjtjdxmxxllcrqbsyjbgwynnggbcnxpjtgpapfgdj&&&&qbhbncfjyzjkjkhxqfgqckfhygkhdkllsdjqxpqyaybnqsxqnszswhbsxwhxwbzzxdmndjbsbkbbzklylxgwxjjwaqzmywsjqlsj&&&&xxjqwjeqxnchetlzalyyyszzpnkyzcptlshtzcfycyxyljsdcjqagyslcllyyysslqqqnldxzsccscadycjysfsgbfrsszqsbxjp&&&&sjysdrckgjlgtkzjzbdktcsyqpyhstcldjnhmymcgxyzhjdctmhltxzhylamoxyjcltyfbqqjpfbdfehthsqhzywwcncxcdwhowg&&&&yjlegmdqcwgfjhcsntmydolbygnqwesqpwnmlrydzszzlyqpzgcwxhnxpyxshmdqjgztdppbfbhzhhjyfdzwkgkzbldnzsxhqeeg&&&&zxylzmmzyjzgszxkhkhtxexxgylyapsthxdwhzydpxagkydxbhnhnkdnjnmyhylpmgecslnzhkxxlbzzlbmlsfbhhgsgyyggbhsc&&&&yajtxglxtzmcwzydqdqmngdnllszhngjzwfyhqswscelqajynytlsxthaznkzzsdhlaxxtwwcjhqqtddwzbcchyqzflxpslzqgpz&&&&sznglydqtbdlxntctajdkywnsyzljhhdzckryyzywmhychhhxhjkzwsxhdnxlyscqydpslyzwmypnkxyjlkchtyhaxqsyshxasmc&&&&hkdscrsgjpwqsgzjlwwschsjhsqnhnsngndantbaalczmsstdqjcjktscjnxplggxhhgoxzcxpdmmhldgtybynjmxhmrzplxjzck&&&&zxshflqxxcdhxwzpckczcdytcjyxqhlxdhypjqxnlsyydzozjnhhqezysjyayxkypdgxddnsppyzndhthrhxydpcjjhtcnnctlhb&&&&ynyhmhzllnnxmylllmdcppxhmxdkycyrdltxjchhznxclcclylnzsxnjzzlnnnnwhyqsnjhxynttdkyjpychhyegkcwtwlgjrlgg&&&&tgtygyhpyhylqyqgcwyqkpyyettttlhyylltyttsylnyzwgywgpydqqzzdqnnkcqnmjjzzbxtqfjkdffbtkhzkbxdjjkdjjtlbwf&&&&zpptkqtztgpdwntpjyfalqmkgxbcclzfhzcllllanpnxtjklcclgyhdzfgyddgcyyfgydxkssendhykdndknnaxxhbpbyyhxccga&&&&pfqyjjdmlxcsjzllpcnbsxgjyndybwjspcwjlzkzddtacsbkzdyzypjzqsjnkktknjdjgyepgtlnyqnacdntcyhblgdzhbbydmjr&&&&egkzyheyybjmcdtafzjzhgcjnlghldwxjjkytcyksssmtwcttqzlpbszdtwcxgzagyktywxlnlcpbclloqmmzsslcmbjcsdzkydc&&&&zjgqjdsmcytzqqlnzqzxssbpkdfqmddzzsddtdmfhtdycnaqjqkypbdjyyxtljhdrqxlmhkydhrnlklytwhllrllrcxylbnsrnzz&&&&symqzzhhkyhxksmzsyzgcxfbnbsqlfzxxnnxkxwymsddyqnggqmmyhcdzttfgyyhgsbttybykjdnkyjbelhdypjqnfxfdnkzhqks&&&&byjtzbxhfdsbdaswpawajldyjsfhblcnndnqjtjnchxfjsrfwhzfmdrfjyxwzpdjkzyjympcyznynxfbytfyfwygdbnzzzdnytxz&&&&emmqbsqehxfznbmflzzsrsyqjgsxwzjsprytjsjgskjjgljjynzjjxhgjkymlpyyycxycgqzswhwlyrjlpxslcxmnsmwklcdnkny&&&&npsjszhdzeptxmwywxyysywlxjqcqxzdclaeelmcpjpclwbxsqhfwrtfnjtnqjhjqdxhwlbyccfjlylkyynldxnhycstyywncjtx&&&&ywtrmdrqnwqcmfjdxzmhmayxnwmyzqtxtlmrspwwjhanbxtgzypxyyrrclmpamgkqjszycymyjsnxtplnbappypylxmyzkynldgy&&&&jzcchnlmzhhanqnbgwqtzmxxmllhgdzxnhxhrxycjmffxywcfsbssqlhnndycannmtcjcypnxnytycnnymnmsxndlylysljnlxys&&&&sqmllyzlzjjjkyzzcsfbzxxmstbjgnxnchlsnmcjscyznfzlxbrnnnylmnrtgzqysatswryhyjzmgdhzgzdwybsscskxsyhytsxg&&&&cqgxzzbhyxjscrhmkkbsczjyjymkqhzjfnbhmqhysnjnzybknqmcjgqhwlsnzswxkhljhyybqcbfcdsxdldspfzfskjjzwzxsddx&&&&jseeegjscssygclxxnwwyllymwwwgydkzjggggggsycknjwnjpcxbjjtqtjwdsspjxcxnzxnmelptfsxtllxcljxjjljsxctnswx&&&&lennlyqrwhsycsqnybyaywjejqfwqcqqcjqgxaldbzzyjgkgxbltqyfxjltpydkyqhpmatlcndnkxmtxynhklefxdllegqtymsaw&&&&hzmljtkynxlyjzljeeyybqqffnlyxhdsctgjhxywlkllxqkcctnhjlqmkkzgcyygllljdcgydhzwypysjbzjdzgyzzhywyfqdtyz&&&&szyezklymgjjhtsmqwyzljyywzcsrkqyqltdxwcdrjalwsqzwbdcqyncjnnszjlncdcdtlzzzacqqzzddxyblxcbqjylzllljddz&&&&jgyqyjzyxnyyyexjxksdaznyrdlzyyynjlslldyxjcykywnqcclddnyyynycgczhjxcclgzqjgnwnncqqjysbzzxyjxjnxjfzbsb&&&&dsfnsfpzxhdwztdmpptflzzbzdmyypqjrsdzsqzsqxbdgcpzswdwcsqzgmdhzxmwwfybpngphdmjthzsmmbgzmbzjcfzhfcbbnmq&&&&dfmbcmcjxlgpnjbbxgyhyyjgptzgzmqbqdcgybjxlwnkydpdymgcftpfxyztzxdzxtgkptybbclbjaskytssqyymscxfjhhlslls&&&&jpqjjqaklyldlycctsxmcwfgngbqxllllnyxtyltyxytdpjhnhgnkbyqnfjyyzbyyessessgdyhfhwtcqbsdzjtfdmxhcnjzymqw&&&&srxjdzjqbdqbbsdjgnfbknbxdkqhmkwjjjgdllthzhhyyyyhhsxztyyyccbdbpypzyccztjpzywcbdlfwzcwjdxxhyhlhwczxjtc&&&&nlcdpxnqczczlyxjjcjbhfxwpywxzpcdzzbdccjwjhmlxbqxxbylrddgjrrctttgqdczwmxfytmmzcwjwxyywzzkybzcccttqnhx&&&&nwxxkhkfht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