Results 4 issues of Xcode

`InDB.databases()` 这样写报错吗? ![image](https://user-images.githubusercontent.com/25955870/124093136-24a3f900-da8a-11eb-9372-8fc0585341f2.png)

版本:mb108_241102 ![DC933573-AA86-465a-B5CC-865D94495067](https://github.com/user-attachments/assets/aa1b83dc-f4c5-44ba-a4ae-03176e7d8e41)

版本:mb108_241102 ![68C9538F-E971-4334-9D87-D812068D0964](https://github.com/user-attachments/assets/60887a29-b654-4101-9126-44c9ef53c105) ![DC933573-AA86-465a-B5CC-865D94495067](https://github.com/user-attachments/assets/1054fc03-a85c-4e72-b349-d4c131299d84)