添加libresolv.tbd庫，即可解決問題
Undefined symbols for architecture arm64: "_dns_parse_resource_record", referenced from: -[JPUSHSRVResolver processRecord:length:] in jpush-iOS-2.2.0.a(JPUSHSRVResolver.o) "_dns_free_resource_record", referenced from: -[JPUSHSRVResolver processRecord:length:] in jpush-ios-2.2.0.a(JPUSHSRVResolver.o) ld: symbol(s) not found for architecture arm64 clang: error: linker command failed with exit code 1 (use -v to see invocation)
如圖所示：
這個是如何添加的詳細操作:
https://www.crifan.com/swift_xcode_how_to_add_shared_library_libresolv_9_tbd_libresolv_tbd/