Question

我在测试我的应用程序时发现了这个问题，它真的开始惹恼我了。那么环境如下：

未安装Facebook应用
用户登录iOS系统帐户（在设置 - ＆gt; Facebook下）

当我的应用首次尝试对用户进行身份验证时，它会提供此文本框:(我尝试将其清理一下）

2014-01-30 15:20:31.439 Unifeed[2140:70b] Session is <FBSession: 0xb74f9e0, state:         
FBSessionStateClosedLoginFailed, 
loginHandler: 0x0, appID: *************, urlSchemeSuffix: ,    
 tokenCachingStrategy:<FBSessionTokenCachingStrategy: 0xb73bd90>,
 expirationDate: (null),     
refreshDate: (null), attemptedRefreshDate: 0001-12-30 00:00:00 +0000, permissions:(null)>

2014-01-30 15:20:31.440 Unifeed[2140:70b] Session closed
2014-01-30 15:20:31.440 Unifeed[2140:70b] User logged out

2014-01-30 15:20:31.441 Unifeed[2140:70b] Error occured Error Domain=com.facebook.sdk Code=2    
"The operation couldn’t be completed. (com.facebook.sdk error 2.)"
UserInfo=********  
{com.facebook.sdk:ErrorLoginFailedReason=com.facebook.sdk:SystemLoginCancelled,    
com.facebook.sdk:ErrorInnerErrorKey=Error Domain=com.apple.accounts Code=7 "The operation 
couldn’t be completed. (com.apple.accounts error 7.)", 
com.facebook.sdk:ErrorSessionKey=<FBSession: 0xb74f9e0, state: FBSessionStateClosedLoginFailed,   
loginHandler: 0x0, appID: ************, urlSchemeSuffix: 
, tokenCachingStrategy:<FBSessionTokenCachingStrategy: 
0xb73bd90>, expirationDate: (null), refreshDate: (null), 
attemptedRefreshDate: 0001-12-30 00:00:00 +0000, permissions:(null)>}

2014-01-30 15:20:31.441 Unifeed[2140:70b] User cancelled login
2014-01-30 15:20:31.445 Unifeed[2140:70b] User logged out

我知道这有点令人困惑，但我对它的看法是错误的，因为它认为用户取消了登录过程。事情是我从来没有看到小弹出问我是否要登录或接受权限....所以我添加了Facebook应用程序到手机，它工作...这很好，但如果我有一个用户不是应用程序，但他们已经在手机上登录了FB ....任何人都有任何想法？

我的身份验证代码如下:(几乎只是从FB网站稍加修改）

- (void) facebookSessionChange {
// If the session state is any of the two "open" states when the button is clicked
if (FBSession.activeSession.state == FBSessionStateOpen
    || FBSession.activeSession.state == FBSessionStateOpenTokenExtended) {

    // Close the session and remove the access token from the cache
    // The session state handler (in the app delegate) will be called automatically
    [FBSession.activeSession closeAndClearTokenInformation];

    // If the session state is not any of the two "open" states when the button is clicked
} else {
    // Open a session showing the user the login UI
    [FBSession openActiveSessionWithReadPermissions:permissions
                                       allowLoginUI:YES
                                  completionHandler:
     ^(FBSession *session, FBSessionState state, NSError *error) {
         [self sessionStateChanged:session state:state error:error];
     }];
}
 }

 - (void)sessionStateChanged:(FBSession *)session state:(FBSessionState) state error:(NSError *)error
 {

NSLog(@"Session is %@", session);
// If the session was opened successfully
if (!error && state == FBSessionStateOpen){
    NSLog(@"Session opened");
    // Show the user the logged-in UI
    [self userLoggedIn];
    return;
}
if (state == FBSessionStateClosed || state == FBSessionStateClosedLoginFailed){
    // If the session is closed
    NSLog(@"Session closed");
    // Show the user the logged-out UI
    [self userLoggedOut];
}

// Handle errors
if (error){
    NSLog(@"Error occured %@", error);
    if ([FBErrorUtility shouldNotifyUserForError:error] == YES){
        NSLog(@"Error occured %@", error);
    } else {

        // If the user cancelled login, do nothing
        if ([FBErrorUtility errorCategoryForError:error] == FBErrorCategoryUserCancelled) {
            NSLog(@"User cancelled login");

            // Handle session closures that happen outside of the app
        } else if ([FBErrorUtility errorCategoryForError:error] == FBErrorCategoryAuthenticationReopenSession){
            NSLog(@"Session is no longer valid");

        } else {
            //Get more error information from the error
            NSDictionary *errorInformation = [[[error.userInfo objectForKey:@"com.facebook.sdk:ParsedJSONResponseKey"] objectForKey:@"body"] objectForKey:@"error"];
            NSLog(@"Error occured : %@", [errorInformation objectForKey:@"message"]);
        }
    }
    // Clear this token
    [FBSession.activeSession closeAndClearTokenInformation];
    // Show the user the logged-out UI
    [self userLoggedOut];
}
}

// Show the user the logged-out UI
- (void)userLoggedOut 
{
    NSLog(@"User logged out");
}

// Show the user the logged-in UI
- (void)userLoggedIn 
{
    NSLog(@"User Logged in");
    [_delegate doneLogginginToFb];
}

我试过改变我的身份验证方式，但总是遇到同样的问题......有什么想法吗？

由于

A

Answer 1

我认为我确实在这里重现了您的错误，您的应用程序在设置中被拒绝访问Facebook帐户（出于某种原因，也许您点击了＆＃34;不允许＆＃34; ...）在用户拒绝访问或关闭Facebook设置中的开关后，应用程序将不会再次询问权限，每次尝试连接时都会失败并显示FBErrorCategoryUserCancelled状态。

要解决此问题，请转到设置＆gt;一般＆gt;重置，然后重置位置＆amp;隐私即可。在运行应用程序之后，您应该能够看到提示请求权限。

Answer 2

转到Facebook开发者＆gt;你的应用＆gt;设置＆gt;基本

点击 +添加平台

输入您的套件ID

启用单点登录

保存更改。

Answer 3

我遇到了同样的问题，它让我发疯了。我通过将Facebook SDK更新到最新版本来解决问题。

不确定这是否适合您，但我希望这有助于某人。

Facebook登录 - 如果存在用户帐户（并且未安装应用程序），则登录失败

3 个答案: