Gmail API iOS Xcode 7，Swift 2

Question

我正在关注Google的教程https://developers.google.com/gmail/api/quickstart/ios?ver=swift来创建一个简单的Swift项目，但编译器会抛出错误。这是由于Xcode 7，Swift 2中的一些变化吗？任何想法如何解决它

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) 

Answer 1

更新Gmail API到最新版本修复此问题。