Question

我正在开发一个使用Facebook登录和共享的iOS应用程序。这需要在各个地方检查活动会话状态。

Facebook提供的代码检查当前状态并决定是否打开新会话。但是，记录会话状态表明它可能是开放的，即使与FBSessionState常量的比较可能表明它已关闭。

例如，使用以下代码（facebook＆＃39; s），即使我的会话状态记录为1，它也不等于FBSessionStateOpen或FBSessionStateOpenTokenExtended，并开了一个新的会议。

NSLog(@"facebook session state: %lu", FBSession.activeSession.state);
// log shows 1

if (FBSession.activeSession.state == FBSessionStateOpen
    || FBSession.activeSession.state == FBSessionStateOpenTokenExtended) {

    NSLog(@"facebook session already open");
    // do stuff...

} else {
    // new session opened anyway
    NSLog(@"open new facebook session");
    /* code to open a session omitted here
    ...
    */
}

尽管定义不变，但显示1 = FBSessionStateOpen。

FBSession.h：

typedef NS_ENUM(NSUInteger, FBSessionState) {
/*! One of two initial states indicating that no valid cached token was found */
FBSessionStateCreated                   = 0,
/*! One of two initial session states indicating that a cached token was loaded;
 when a session is in this state, a call to open* will result in an open session,
 without UX or app-switching*/
FBSessionStateCreatedTokenLoaded        = 1,
/*! One of three pre-open session states indicating that an attempt to open the session
 is underway*/
FBSessionStateCreatedOpening            = 2,

/*! Open session state indicating user has logged in or a cached token is available */
FBSessionStateOpen                      = 1 | FB_SESSIONSTATEOPENBIT,
/*! Open session state indicating token has been extended, or the user has granted additional permissions */
FBSessionStateOpenTokenExtended         = 2 | FB_SESSIONSTATEOPENBIT,

/*! Closed session state indicating that a login attempt failed */
FBSessionStateClosedLoginFailed         = 1 | FB_SESSIONSTATETERMINALBIT, // NSError obj w/more info
/*! Closed session state indicating that the session was closed, but the users token
 remains cached on the device for later use */
FBSessionStateClosed                    = 2 | FB_SESSIONSTATETERMINALBIT, // "
};

这是一个错误还是有什么理由说明为什么facebook的代码应该真正开启一个新的会话？我应该与州的int值而不是常量进行比较吗？为什么记录的值不同意常量？

...此外，重新打开状态后记录状态，它会记录为513或514，这与任何常量都不一致。

Answer 1

根据常量的typedef枚举，状态1为FBSessionStateCreatedTokenLoaded。评论说＆＃34;两个初始会话状态之一，表明已加载缓存的令牌;当会话处于此状态时，对open *的调用将导致打开会话，而无需UX或应用程序切换＆＃34;。

所以我接受了这个建议，解决方案运行良好，会话在没有UX或应用程序切换的情况下打开：

    if (FBSession.activeSession.state == FBSessionStateCreatedTokenLoaded) {
        NSLog(@"fb session state created token loaded.");
        [FBSession.activeSession openWithCompletionHandler:^(FBSession *session, FBSessionState status, NSError *error) {
            if (FBSession.activeSession.state == FBSessionStateOpen) {
                // do stuff
            }
        }];
    }
    else if (FBSession.activeSession.state == FBSessionStateOpen
        || FBSession.activeSession.state == FBSessionStateOpenTokenExtended) {
        NSLog(@"fb session already open");
        // do stuff

    } else {
        NSLog(@"open new facebook session");
        // open new session...
    }

facebook - FBSessionState常量的问题

1 个答案: