iOS Undefined symbols for architecture arm64: "_OBJC_CLASS_$_RPScreenRecorder"错误

在自己 demo 工程运行是那么的流畅，但是一给游戏那边，就有如下的问题点！！原来是没有导入 ReplayKit 框架时，RPScreenRecorder 和 RPBroadcastActivity-+ViewController 是 ReplayKit。

Undefined symbols for architecture arm64:
  "_OBJC_CLASS_$_RPScreenRecorder", referenced from:
      objc-class-ref in GDReplayKitLive.o
      objc-class-ref in GDCamera.o
      objc-class-ref in GoodReplayFunction.o
  "_OBJC_CLASS_$_RPBroadcastActivityViewController", referenced from:
      objc-class-ref in GDReplayKitLive.o
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)