signInSilently()生成错误代码= -4

Question

我遇到这种情况,GIDSignIn.sharedInstance().signInSilently()返回错误:

错误域= com.google.GIDSignIn代码= -4"无法完成操作.(com.google.GIDSignIn错误-4.)"

我似乎无法在google signin docs或stackOverflow下找到任何关于此错误的文档.

如果我为之前没有签名的用户请求静默signIn,我希望这会发生错误.但令我惊讶的是,当我有一个用户以前签名并且我尝试在几秒钟后第二次静默登录时,它甚至会发生.

我遇到困难的第二个问题是确定是否有用户登录使用:

GIDSignIn.sharedInstance().currentUser

这是一个零或一个GIDGoogleUser对象.

任何帮助在这个问题上取得进展将不胜感激.

谢谢

Answer 1

以下是错误代码GIDSignIn.h.当密钥链中没有auth令牌时,-4代码将被发送signInSilently.看评论.

// A list of potential error codes returned from the Google Identity SDK.
typedef NS_ENUM(NSInteger, GIDSignInErrorCode) {
  // Indicates an unknown error has occured.
  kGIDSignInErrorCodeUnknown = -1,
  // Indicates a problem reading or writing to the application keychain.
  kGIDSignInErrorCodeKeychain = -2,
  // Indicates no appropriate applications are installed on the user's device which can handle
  // sign-in. This code will only ever be returned if using webview and switching to browser have
  // both been disabled.
  kGIDSignInErrorCodeNoSignInHandlersInstalled = -3,
  // Indicates there are no auth tokens in the keychain. This error code will be returned by
  // signInSilently if the user has never signed in before with the given scopes, or if they have
  // since signed out.
  kGIDSignInErrorCodeHasNoAuthInKeychain = -4,
  // Indicates the user canceled the sign in request.
  kGIDSignInErrorCodeCanceled = -5,
};

对于谷歌SDK,我发现头文件注释实际上是一个非常好看的地方,通常比任何已发布的文档更具信息性.

Answer 2

我遇到了同样的问题.问题出在方法上:

[[GIDSignIn sharedInstance] setScopes:@[@"https://www.googleapis.com/auth/plus.stream.read", @"https://www.googleapis.com/auth/plus.me"]];

你应该先叫它:

[[GIDSignIn sharedInstance] hasAuthInKeychain]    

和

[[GIDSignIn sharedInstance] signIn]