最近实现一个类似于微信通讯录的功能//

首先,这个功能是根据大写首字母来分组的，这就来了，汉字是不好分组的，只能使用拼音，那么怎么将汉字转换成拼音呢？下面就有一个方法

例如:

//初始化代码

    NSString * str =@"中华人民共和国万岁";

   NSString * PYStr  = [selftransform:str];

    NSLog(@"拼音%@",PYStr);

    

 //汉字转拼音所封装的方法

-(NSString *)transform:(NSString *)str

{

    NSMutableString *pinyin = [str mutableCopy];

    CFStringTransform((__bridgeCFMutableStringRef)pinyin,NULL,kCFStringTransformMandarinLatin,NO);

    CFStringTransform((__bridgeCFMutableStringRef)pinyin,NULL,kCFStringTransformStripCombiningMarks,NO);

    NSLog(@"%@", pinyin);

    return [pinyinuppercaseString];

}

#pragma mark - 拼音

MTTUtil类里面的方法,如下

+(char)pinyinFirstLetter:(unsignedshort)hanzi{

   int index = hanzi -HANZI_START;//宏定义

   if (index >=0 && index <=HANZI_COUNT)//宏定义

    {

       returnfirstLetterArray[index];

    }

   else

    {

       return'#';

    }

}

+(char)getFirstChar:(constNSString *)str{

   if (nil == str ||0 == [strlength]) {

       return'#';

    }

   constchar * firstChar = [strUTF8String];

   if ( ('a'<=  *firstChar && *firstChar <='z')

        || ('A' <= *firstChar && *firstChar <='Z')) {

       return *firstChar;

    }

   else {

       return [MTTUtilpinyinFirstLetter:[strcharacterAtIndex:0]];

    }

}

//这是我定义了一个头文件的内容

#define HANZI_START19968

#define HANZI_COUNT20902

staticchar firstLetterArray[HANZI_COUNT] =

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"xy";

现在已经可以将字符串转换成拼音，那么现在可能有的朋友已经有思路了

先理理思路啊，我们是根据字符串的大写首字母来判断的，那么首先我要知道我的所有好友里面有多少个字符串，他们总共占有了多少个字母，我会先把这些字母根据汉语拼音的顺序进行排列，使用容器储存起来，为了方便判断有多少个区，就是数组吧，因为数组是有序的，方便我进行排序

    //得到所有好友的首字母，苹果给我们提供了一个关于数组排序的方法，

    self.allIndexes =[NSMutableArrayarrayWithArray:[[self.itemsallKeys]sortedArrayUsingComparator:^NSComparisonResult(id obj1,id obj2){

//然后就是调用比较字母的顺序

        char char1=[MTTUtilgetFirstChar:obj1];

        char char2=[MTTUtilgetFirstChar:obj2];

        NSString *f1=[NSStringstringWithFormat:@"%c",char1];

        NSString *f2=[NSStringstringWithFormat:@"%c",char2];

        return [f1compare: f2];

        return [f1compare: f2];

    }] ];

那么self.items是什么,self.items是个字典，key值是我的好友的大写字母，value是大写字母中对应的好友，实现代码，使用字典的话就方便self.

allIndexes来找到对应的数组了

根据如下：

-(NSMutableDictionary *)sortByContactPy 

{

//

[[DDUserModule shareInstance] getAllFriends]];得到我的所有好友，是个数组

    return [ContactsModulesortContractsByPY:[[DDUserModuleshareInstance]getAllFriends]];

}

+(NSMutableDictionary *)sortContractsByPY:(NSArray *)arr

{

    NSMutableDictionary *dic = [NSMutableDictionarynew];

　//

MTTUserEntity是我的封装的好友的model

    for (MTTUserEntity * userin arr) {

//[user getUserShowName]得到好友的名字

        if ([usergetUserShowName]) {

            fl = [[[usergetUserShowName]substringWithRange:NSMakeRange(0,1)]uppercaseString];

            //转成了可变字符串

            NSMutableString *str = [NSMutableStringstringWithString:fl];

            //先转换为带声调的拼音

            CFStringTransform((CFMutableStringRef)str,NULL,kCFStringTransformMandarinLatin,NO);

            //再转换为不带声调的拼音

            CFStringTransform((CFMutableStringRef)str,NULL,kCFStringTransformStripDiacritics,NO);

            //转化为大写拼音

            NSString *pinYin = [strcapitalizedString];

            

            fl = [pinYinsubstringToIndex:1];

        }

        unichar keyChar=[flcharacterAtIndex:0];

        if(keyChar <'A' || keyChar >'Z'){

            fl=@"#";

        }

        if ([dicsafeObjectForKey:fl]) {

            NSMutableArray *arr = [dicsafeObjectForKey:fl];

            [arraddObject:user];

        }else{

            NSMutableArray *arr = [[NSMutableArrayalloc]initWithArray:@[user]];

            [dicsetObject:arrforKey:fl];

        }

    }

    

    [dic enumerateKeysAndObjectsUsingBlock:^(id key,id obj,BOOL *stop) {

        NSArray *preData = obj;

        NSMutableArray *tmp = [[NSMutableArrayalloc]initWithArray:preData];

        NSArray *sortDescriptors = [NSArrayarrayWithObject:[NSSortDescriptorsortDescriptorWithKey:@"pyname"ascending:YES]];

        [tmp sortUsingDescriptors:sortDescriptors];

        [dic safeSetObject:tmpforKey:key];

    }];

    return dic;

}

//这样以来我的多少个区头，每个区有多少个好友，区头的顺序排列都有了，现在就可以使用UI 显示了

//总共有多少区

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView

{

    

        return [self.allIndexescount]+1;

    }

//每个区有多少行

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

{

    

            NSString *keyStr = [selfallIndexes][(NSUInteger) (section -1)];

            NSArray *arr = (self.items)[keyStr];

            return [arrcount];

        

    }

//显示首字母对应的区头

- (UIView*)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section

{

            text = [self.allIndexes[section - 1]uppercaseString];

//将text显示在UI上

    UIView *sectionHeadView = [[UIViewalloc]initWithFrame:CGRectMake(0,0,SCREEN_WIDTH,22)];

    [sectionHeadView setBackgroundColor:RGB(240,240,245)];

    UILabel *sectionHeaderLabel = [[UILabelalloc]initWithFrame:CGRectMake(10,4.5,SCREEN_WIDTH,13)];

    [sectionHeaderLabel setText:text];

    [sectionHeaderLabel setTextColor:RGB(144,144,148)];

    [sectionHeaderLabel setFont:systemFont(13)];

    [sectionHeadView addSubview:sectionHeaderLabel];

    return sectionHeadView;

    }

//显示cell上的好友信息

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

//得到对应的key值

            NSString *keyStr = [[selfallIndexes]objectAtIndex:indexPath.section-1];

            NSLog(@"关键字符串%@",keyStr);

//根据key值取出数组

            NSArray *userArray =[self.itemsobjectForKey:keyStr];

//根据对应的行取出对象model

            MTTUserEntity *user = [userArrayobjectAtIndex:indexPath.row];

//展示

            [cellsetCellContent:[usergetAvatarUrl]Name:[usergetUserShowName]Placeholder:[usergetPlaceholderImage]];

}

//在搜索好友的情况下，使用了searchBar,searchBarDelegate,后续的代码相对简单许多

- (BOOL)searchBarShouldBeginEditing:(UISearchBar *)searchBar

{

    [selfhiddenNofriend:YES];

    [_searchBarsetShowsCancelButton:YESanimated:YES];

    [self.searchPlaceholderViewsetHidden:NO];

    return YES;

}

- (void)searchBarCancelButtonClicked:(UISearchBar *)searchBar{

    [selfendSearch];

}

-(void)searchBarTextDidBeginEditing:(UISearchBar *)searchBar {

    

    for (id objin [searchBarsubviews]) {

        for (id ccin [objsubviews]) {

            if ([cc isKindOfClass:[UIButtonclass]]) {

               UIButton *btn = (UIButton *)obj;

                [btnsetTintColor:TTBLUE];

            }

        }

    }

}

- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText

{

    if(searchText.length){

        [self.searchPlaceholderViewsetHidden:YES];

        [self.searchTableViewsetHidden:NO];

        [self.searchdicremoveAllObjects];

        [self.searchKeyArrayremoveAllObjects];

        [self.searchTableViewreloadData];

        

        

        

        NSMutableArray *searchResultArray=[[NSMutableArrayalloc]init];

        

        NSArray *users=[[DDUserModuleshareInstance]getAllFriends];

        

        for(MTTUserEntity *friendin users){

            

            NSString *searchInfo=[friend getUserSearchInfo];

            DDLog(@"%@===",searchInfo);

//判断输入文本字符串中的字节是否含有好友的名字的字节

            if([searchInfo rangeOfString:searchText].location !=NSNotFound)//_roaldSearchText

            {

              //[self.searchdic setValue:friend forKey:friend.objID];

                [searchResultArrayaddObject:friend];

            }

            else

            {

               DDLog(@"no");

            }

        }

        

       if(searchResultArray.count>0)

       {

//如果含有的话，同上直接显示她的在搜索的tableview上

           self.searchdic=[ContactsModulesortContractsByPY:searchResultArray];

           self.searchKeyArray =[NSMutableArrayarrayWithArray:[[self.searchdicallKeys]sortedArrayUsingComparator:^NSComparisonResult(id obj1,id obj2){

              char char1=[MTTUtilgetFirstChar:obj1];

              char char2=[MTTUtilgetFirstChar:obj2];

              NSString *f1=[NSStringstringWithFormat:@"%c",char1];

              NSString *f2=[NSStringstringWithFormat:@"%c",char2];

              return [f1compare: f2];

           }] ];

           

           NSLog(@"%@",_searchKeyArray);

           if([self.searchKeyArraycount]>0)

           {

              if([self.searchKeyArray[0]characterAtIndex:0]=='#')

               {

                  id fkey= [self.searchKeyArrayobjectAtIndex:0];

                   [self.searchKeyArrayremoveObjectAtIndex:0];

                   [self.searchKeyArrayaddObject:fkey];

               }

               

               [_searchNoFriengViewsetHidden:YES];

           }

           [self.searchTableViewreloadData];

       }

        else

        {

            //search -- no result

//            [self.view addSubview: _searchNoFriengView];

            [_searchNoFriengViewsetHidden:NO];

        }

        

    }else{

        [self.searchPlaceholderViewsetHidden:NO];

        [self.searchTableViewsetHidden:YES];

        [self.searchTableViewreloadData];

        

    }

}

- (void)endSearch{

    // 原tableview允许滚动

    self.tableView.scrollEnabled = YES;

    self.searchBar.text = @"";

    [self.searchPlaceholderViewsetHidden:YES];

    [self.searchTableViewsetHidden:YES];

    // 显示tabbar

    self.tabBarController.tabBar.hidden = NO;

    [self.searchBarresignFirstResponder];

    [self.searchBarsetShowsCancelButton:NOanimated:YES];

    if([self.itemscount]>0){

        

        [selfhiddenNofriend:YES];

    }

    else

    {

        [selfhiddenNofriend:NO];

    }

    

    [self.searchNoFriengViewsetHidden:YES];

}

谢谢大家！！～