Swift2 Xcode 7中的Gmail API iOS，Swift 2

我按照谷歌的教程创建了一个简单的Swift项目，但编译器抛出以下错误。这是因为Xcode 7、Swift 2中的某些更改吗？你知道怎么修吗

Undefined symbols for architecture arm64:
  "_OBJC_METACLASS_$_GTLService", referenced from:
      _OBJC_METACLASS_$_GTLServiceGmail in GTLGmail_Sources.o
     (maybe you meant: _OBJC_METACLASS_$_GTLServiceGmail)
  "_OBJC_CLASS_$_GTMOAuth2ViewControllerTouch", referenced from:
      type metadata accessor for ObjectiveC.GTMOAuth2ViewControllerTouch in ViewController.o
  "_OBJC_METACLASS_$_GTLObject", referenced from:
      _OBJC_METACLASS_$_GTLGmailDraft in GTLGmail_Sources.o
      _OBJC_METACLASS_$_GTLGmailHistory in GTLGmail_Sources.o
      _OBJC_METACLASS_$_GTLGmailHistoryLabelAdded in GTLGmail_Sources.o
      _OBJC_METACLASS_$_GTLGmailHistoryLabelRemoved in GTLGmail_Sources.o
      _OBJC_METACLASS_$_GTLGmailHistoryMessageAdded in GTLGmail_Sources.o
      _OBJC_METACLASS_$_GTLGmailHistoryMessageDeleted in GTLGmail_Sources.o
      _OBJC_METACLASS_$_GTLGmailLabel in GTLGmail_Sources.o
      ...
  "_OBJC_METACLASS_$_GTLQuery", referenced from:
      _OBJC_METACLASS_$_GTLQueryGmail in GTLGmail_Sources.o
     (maybe you meant: _OBJC_METACLASS_$_GTLQueryGmail)
  "_OBJC_CLASS_$_GTLService", referenced from:
      _OBJC_CLASS_$_GTLServiceGmail in GTLGmail_Sources.o
     (maybe you meant: _OBJC_CLASS_$_GTLServiceGmail)
  "_OBJC_CLASS_$_GTLQuery", referenced from:
      _OBJC_CLASS_$_GTLQueryGmail in GTLGmail_Sources.o
     (maybe you meant: _OBJC_CLASS_$_GTLQueryGmail)
  "_OBJC_CLASS_$_GTLObject", referenced from:
      _OBJC_CLASS_$_GTLGmailDraft in GTLGmail_Sources.o
      _OBJC_CLASS_$_GTLGmailHistoryLabelAdded in GTLGmail_Sources.o
      _OBJC_CLASS_$_GTLGmailHistoryLabelRemoved in GTLGmail_Sources.o
      _OBJC_CLASS_$_GTLGmailMessage in GTLGmail_Sources.o
      _OBJC_CLASS_$_GTLGmailHistoryMessageAdded in GTLGmail_Sources.o
      _OBJC_CLASS_$_GTLGmailHistoryMessageDeleted in GTLGmail_Sources.o
      _OBJC_CLASS_$_GTLGmailHistory in GTLGmail_Sources.o
      ...
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

---

将Gmail API更新为最新版本解决了这个问题。

刚刚收到Gmail API论坛的回复，称新版sdk解决了这个问题。我还没试过，看到了吗