问题
I\'m using die Facebook SDK 3.1.1 to implement FB Connect in my iOS application. This works fine in the simple case with either the new FB integration (logged in on iOS) or falling back to the normal authorization via web view (I do not have the native Facebook application installed in both cases). The problem occurs when I switch the account on iOS level. Logging out and logging in with a different FB user account.
To log in/authorize I perform:
[FBSession openActiveSessionWithReadPermissions:nil allowLoginUI:allowLoginUI
completionHandler:^(FBSession *session, FBSessionState state, NSError *error) {
[self sessionStateChanged:session state:state error:error];
}];
If then get a FBSessionStateClosedLoginFailed every time even though I perform a closeAndClearTokenInformation when that state is reached:
- (void)sessionStateChanged:(FBSession *)session
state:(FBSessionState) state
error:(NSError *)error
{
NSLog(@\"Session State Changed: %u\", [[FBSession activeSession] state]);
switch (state) {
case FBSessionStateOpen:
break;
case FBSessionStateClosed:
case FBSessionStateClosedLoginFailed:
NSLog(@\"FBSessionStateClosedLoginFailed ERROR: %@\", [error description]);
[[FBSession activeSession] closeAndClearTokenInformation];
break;
default:
break;
}
However, I receive the same state on every retry. My log says the following:
FBSDKLog: FBSession **INVALID** transition from FBSessionStateCreated to FBSessionStateClosed
FBSDKLog: FBSession transition from FBSessionStateCreated to FBSessionStateCreatedOpening
FBSDKLog: FBSession transition from FBSessionStateCreatedOpening to FBSessionStateClosedLoginFailed Session State Changed: 257
FBSessionStateClosedLoginFailed TOKEN: (null)
FBSessionStateClosedLoginFailed ERROR: Error Domain=com.facebook.sdk Code=2 \"The operation couldn’t be completed. (com.facebook.sdk error 2.)\" UserInfo=0xb24cc20 {com.facebook.sdk:ErrorLoginFailedReason=com.facebook.sdk:ErrorLoginFailedReason}
Can anyone reproduce this or has any idea where the problem might lie?
回答1:
Another answer gives a way to manually resync the device with the server. I defined a method called fbRsync to call this code. Make sure to #import <Accounts/Accounts.h> in your implementation file and then define this method:
-(void)fbResync
{
ACAccountStore *accountStore;
ACAccountType *accountTypeFB;
if ((accountStore = [[ACAccountStore alloc] init]) && (accountTypeFB = [accountStore accountTypeWithAccountTypeIdentifier:ACAccountTypeIdentifierFacebook] ) ){
NSArray *fbAccounts = [accountStore accountsWithAccountType:accountTypeFB];
id account;
if (fbAccounts && [fbAccounts count] > 0 && (account = [fbAccounts objectAtIndex:0])){
[accountStore renewCredentialsForAccount:account completion:^(ACAccountCredentialRenewResult renewResult, NSError *error) {
//we don't actually need to inspect renewResult or error.
if (error){
}
}];
}
}
I then call fbResync if openActiveSessionWithReadPermissions yields an error:
[FBSession openActiveSessionWithReadPermissions:permissions
allowLoginUI:YES
completionHandler:^(FBSession *session, FBSessionState state, NSError *error) {
if(error)
{
NSLog(@"Session error");
[self fbResync];
[NSThread sleepForTimeInterval:0.5]; //half a second
[FBSession openActiveSessionWithReadPermissions:permissions
allowLoginUI:YES
completionHandler:^(FBSession *session, FBSessionState state, NSError *error) {
[self sessionStateChanged:session state:state error:error];
}];
}
else
[self sessionStateChanged:session state:state error:error];
}];
The half a second delay is likely unnecessary, but it currently gives me piece of mind.
This seems to solve the problem for me. I can now switch between Facebook accounts and am able to log in. Yay!
回答2:
I had the same problem. Check that your FB App is enabled in Settings -> Facebook. Mine was disabled (even though I don't remember disabling it) and once I enabled it, it was fixed.
In my test process, I've added and removed my FB App several times from my FB Account, which is linked with my iPhone. It may explain why, magically, my app was disabled.
回答3:
In ios 6 with fb sdk 3.1.1. Please pass permissions param as "nil or email" in "[FBSessio openActiveSessionWithReadPermissions..." method. Here my code it was works great.
#define IOS_NEWER_OR_EQUAL_TO_6 ( [ [ [ UIDevice currentDevice ] systemVersion ] floatValue ] >= 6.0 )
-(void)showFBLogin
{
[FBSession.activeSession closeAndClearTokenInformation];
NSArray *permissions = [NSArray arrayWithObjects:@"email, publish_actions, publish_stream", nil];
#ifdef IOS_NEWER_OR_EQUAL_TO_6
permissions = nil; or NSArray *permissions = [NSArray arrayWithObjects:@"email",nil];
#endif
NSLog(@"\npermissions = %@", permissions);
[FBSession openActiveSessionWithReadPermissions:permissions
allowLoginUI:YES
completionHandler:
^(FBSession *session,
FBSessionState state, NSError *error) {
NSLog(@"\nfb sdk error = %@", error);
switch (state) {
case FBSessionStateOpen:
[[FBRequest requestForMe] startWithCompletionHandler:
^(FBRequestConnection *connection, NSDictionary<FBGraphUser> *user, NSError *error) {
if (!error) {
//success
}
}];
break;
case FBSessionStateClosed:
//need to handle
break;
case FBSessionStateClosedLoginFailed:
//need to handle
break;
default:
break;
}
}];
}
回答4:
I have the same problem on 3.1.3 FB SDK with iOS7.1. And I find a solution here. Hope it help!!
I have tried all answers here.
@loganathan nil permissions, @ill_always_be_a_warriors fbResync.
All of those don't work for me.
But I found it will works well when I launch the same code in iPhone 7.1 simulator
(without SSO"Single Sign On")
The same code works well on old version iOS FB SDK(not sure which version, but not 3.13)
(but no SSO will show when try to login)
So, I try to re-write a sample problem. I found several different here.
1. https://developers.facebook.com/docs/ios/getting-started Add new FacebookDisplayName
2. I modify my BundleID for iTune connect but I am not update it back to Faceboook App Dev
After modify those setting, it works on my iOS app with SSO feature.
Hope it help!!
回答5:
Did you Try the RenewSystemCredential Methods? Take a look at this post:
Facebook iOS SDK extendAccessToken not Working - fbDidExtendToken not being called
回答6:
I got the same error. But i used @ill_always_be_a_warriors method: -(void)fbResync but not work for me.
I finally found it's my permissions issue, i removed offline_access permission, it works, hope it helps some one.
来源：https://stackoverflow.com/questions/12838118/facebook-authorization-fails-on-ios6-when-switching-fb-account-on-device