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！！～