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facebook-FBSessionState常量的问题

facebook ios

inorganik · 技术社区 · 10 年前

我正在开发一个使用Facebook登录和共享的iOS应用程序。这需要检查各个位置的活动会话状态。

Facebook提供的代码检查当前状态并决定是否打开新会话。然而,记录会话状态表明它可能是打开的,即使与FBSessionState常量的比较可能表明它是关闭的。

例如,使用以下代码(facebook的),即使我的会话状态记录为 1 ,也不等于 FBSessionStateOpen 或 FBSessionStateOpenTokenExtended ,并打开了一个新会话。

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
    ...
    */
}

尽管恒定的定义显示 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bug还是facebook的代码真的应该打开一个新的会话?我应该与 int 状态值而不是常量?为什么记录的值与常量不一致?

…此外,记录状态之后状态被重新打开,它记录为513或514,这与任何常数都不一致。

1 回复 | 直到 10 年前

inorganik 10 年前

根据常数的typedef枚举 1 是 FBSessionStateCreatedTokenLoaded 。注释中表示“两个初始会话状态之一,表示缓存令牌已加载;当会话处于此状态时,调用open*将导致打开会话,而无需用户体验或应用程序切换”。

因此,我采纳了这一建议,该解决方案运行良好,会话在没有用户体验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...
    }