iOS 中文转首字母

 //获取拼音首字母(传入汉字字符串, 返回大写拼音首字母)
 
 
 
  
(NSString *)firstCharactor:(NSString *)aString
 {
 //转成了可变字符串
 NSMutableString *str = [NSMutableString stringWithString:aString];
 //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 = [str capitalizedString];
 //获取并返回首字母
 return [pinYin substringToIndex:1];
 }