ios - Swift Xcode 错误 : Apple Mach-O Linker Error

Question

Undefined symbols for architecture x86_64:
"_OBJC_CLASS_$_PFLogInViewController", referenced from:
  __TMaCSo21PFLogInViewController in ViewController.o
"_OBJC_CLASS_$_PFSignUpViewController", referenced from:
  __TMaCSo22PFSignUpViewController in ViewController.o
"_OBJC_CLASS_$_PFUser", referenced from:
  __TMaCSo6PFUser in LoginViewController.o
  __TMaCSo6PFUser in ViewController.o
  __TMaCSo6PFUser in signUpViewController.o
"_OBJC_CLASS_$_Parse", referenced from:
  __TMaCSo5Parse in AppDelegate.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

我遇到 Apple Mach-O 链接器错误 1)“_OBJC_CLASS_$_PFLogInViewController”，引用自: 2)“_OBJC_CLASS_$_PFSignUpViewController”，引用自: 3)“_OBJC_CLASS_$_PFUser”，引用自: 4)“_OBJC_CLASS_$_Parse”，引用自: 5) 链接器命令失败，退出代码为 1(使用 -v 查看调用)

我可以知道什么是 Apple Mach-O 链接器错误以及解决此错误的方法吗？

Answer 1

清理构建您的项目。重建。