錯誤訊息

把專案抓下來後編譯，觀察console會發現，
在輸入中文字時會噴錯誤訊息

[NSConcreteMutableAttributedString purifiedString]: unrecognized selector sent to instance 0x14ac8b20

原因是NSMutableAttributedString不能回應QS對NSString擴充的purifiedString method所致，案發現場是

 4 -[QSSearchObjectView setMarkedText:selectedRange:] (in QSInterface) (QSSearchObjectView.m:1539)

 把purifiedString拿掉後重新編譯，會噴

-[NSConcreteMutableAttributedString _encodingCantBeStoredInEightBitCFString]: unrecognized selector sent to instance 0x151170e0

原因是編碼不能被儲存在8-bitCFString，案發現場是

 7 -[QSSearchObjectView setMarkedText:selectedRange:] (in QSInterface) (QSSearchObjectView.m:1541)