PySideErroremittingdataChangedsignalinQAbstractItemModelsubclass我在尝试发出dataChanged信号时遇到此错误：12self.dataChanged.emit(index,index)TypeError:Valuetypesusedonmetafunctions(includingsignals)needtoberegisteredonmetatype:QModelIndex这是我的QAbstractItemModel子类的相关部分：12345678910111213141516171819classPropertyItemM