联系人按照A~~~Z排列

    // 01 创建可变字典，存储每一个key对应的数据列表

    NSMutableDictionary *nationWithCodeDicList = [NSMutableDictionary dictionary];

    // 02 遍历数组_dataList中的小字典

    NSString *path = [[NSBundle mainBundle] pathForResource:@"nationcodenumber" ofType:@"plist"];
    NSArray *_dataList = [NSArray arrayWithContentsOfFile:path];
    for (NSDictionary *nationWithCodeDic in _dataList) {

        // 03 得到国家名称
//        Model *model =[[Model alloc]init];
        NSString *nationName = nationWithCodeDic[@"Name"];

        // 04 转成可变字符串

        NSMutableString *mutableNationName = [NSMutableString stringWithString:nationName];

        // 05 先转换为带声调的拼音

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

        // 06 再转换为不带声调的拼音

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

        // 07 得到首字母之大写形式并设置为字典的一个key

        NSString *key = [mutableNationName substringToIndex:].uppercaseString;
        NSLog(@"%@",key);
        // 08 获取nationWithCodeDicList中key对应的value(存放若干国家小字典的数组，国家名字的首字母都是key)nationWithCodeListKey

        NSMutableArray *nationWithCodeListKey = [nationWithCodeDicList objectForKey:key];

        // 09 若此数组为空，则创建并保存到字典对应的key

        if (nationWithCodeListKey == nil) {

            nationWithCodeListKey = [NSMutableArray array];

            [nationWithCodeDicList setObject:nationWithCodeListKey forKey:key];

        }
        //MKMKMKMKMKMKMKMKMK
        Model *model =[Model currentModelWithDict:nationWithCodeDic];
        // 10 若有此数组，就把本次遍历得到的数据（_dataList中的小字典）加入其中
        [nationWithCodeListKey addObject:model];
//        [nationWithCodeListKey addObject:nationWithCodeDic];
        // 11 获取当前好友列表中所有的组标题 使用compare得到有顺序的字母数组

        self.shouzimuarray = [[nationWithCodeDicList allKeys] sortedArrayUsingSelector:@selector(compare:)];
    }
    self.dictionart = nationWithCodeDicList;