我有一个集成了 Facebook 登录的原生 iOS 应用程序。安装本机 Facebook 应用程序时，登录流程有效。
但是，当我删除该应用程序时，FB Mobile Safari webapp 上的 FB 登录回退。应用程序切换工作正常，但是当控件返回到我的应用程序时，会话状态被声明为 FBSessionStateClosedLoginFailed。
截至 2013 年 6 月 6 日，我正在使用 Facebook SDK v3.5.2 使用 iPad1 iOS5.1.1
/*
* Opens a Facebook session and optionally shows the login UX.
*/
- (BOOL)openSessionWithAllowLoginUI:(BOOL)allowLoginUI {
NSArray *permissions = [[NSArray alloc] initWithObjects:
@"email",
@"publish_actions",
nil];
BOOL result = NO;
FBSession *session =
[[FBSession alloc] initWithAppID:nil
permissions:permissions
urlSchemeSuffix:@"<MySchemeSuffix>"
tokenCacheStrategy:nil];
if (allowLoginUI ||
(session.state == FBSessionStateCreatedTokenLoaded)) {
[FBSession setActiveSession:session];
[session openWithBehavior:FBSessionLoginBehaviorWithFallbackToWebView
completionHandler:
^(FBSession *session, FBSessionState state, NSError *error)
{
[self sessionStateChanged:session state:state error:error];
}];
result = session.isOpen;
}
return result;
}
/*
* If we have a valid session at the time of openURL call, we handle
* Facebook transitions by passing the url argument to handleOpenURL
*/
- (BOOL)application:(UIApplication *)application
openURL:(NSURL *)url
sourceApplication:(NSString *)sourceApplication
annotation:(id)annotation {
// attempt to extract a token from the url
//return [FBSession.activeSession handleOpenURL:url];
BOOL urlWasHandled = [FBAppCall handleOpenURL:url
sourceApplication:sourceApplication
fallbackHandler:^(FBAppCall *call) {
// handle deep links and responses for Login or Share Dialog here
}];
return urlWasHandled;
}
/*
* Callback for session changes.
*/
- (void)sessionStateChanged:(FBSession *)session
state:(FBSessionState) state
error:(NSError *)error
{
switch (state) {
case FBSessionStateOpen:
if (!error) {
if (FBSession.activeSession.isOpen) {
[[FBRequest requestForMe] startWithCompletionHandler:^(FBRequestConnection *connection, NSDictionary<FBGraphUser> *user, NSError *error) {
//Application specific code goes here.
}
}];
}
// We have a valid session
NSLog(@"User session found");
}
break;
case FBSessionStateClosed:
case FBSessionStateClosedLoginFailed:
[FBSession.activeSession closeAndClearTokenInformation];
break;
default:
break;
}
}