the Chinese Pinyin string of the nsstring
| Method | Result |
|---|---|
| Original | @"中文" |
| pinyinWithPhoneticSymbol | @"zhōng wén" |
| pinyin | @"zhong wen" |
| pinyinArray | @[@"zhong", @"wen"] |
| pinyinWithoutBlank | @"zhongwen" |
| pinyinInitialsArray | @[@"z", @"w"] |
| pinyinInitialsString | @"zw" |