ios - 删除旧的三方库，用cocoapods 加入后，就链接错误了，怎么解决？

Question

删除旧的三方库，用cocoapods 加入后，就链接错误了，怎么解决？

Answer 1

1. Is it completely deleted?
2. Is the import method wrong? 3. Is it necessary to add necessary class libraries?

Answer 2

Undefined symbols, obviously I forgot to delete the relevant references in the code.