iOS 获取某个字符串或者汉字的首字母.

+ (NSString *)firstCharactorWithString:(NSString *)string
{
    NSMutableString *str = [NSMutableString stringWithString:string];
    CFStringTransform((CFMutableStringRef) str, NULL, kCFStringTransformMandarinLatin, NO);
    CFStringTransform((CFMutableStringRef)str, NULL, kCFStringTransformStripDiacritics, NO);
    NSString *pinYin = [str capitalizedString];
    return [pinYin substringToIndex:1];
}