Facebook-sdk-for-unity: Facebook Login is not working on on iOS Unity 2018.4.22f1
So when I tried to login to facebook using this API FB.LogInWithReadPermissions, as soon as I hit "Continue", the webview displays for a split seconds then dismisses by itself but the transparent screen is still there blocking all the inputs. None of the callback is triggered.
So I tracked it down to these codes in openURLWithSafariViewController method in FBSDKLoginKit:
if (@available(iOS 11.0, *)) {
if ([sender isAuthenticationURL:url]) {
[self _setSessionCompletionHandlerFromHandler:handler];
[self _openURLWithAuthenticationSession:url];
return;
}
}
- (void)_openURLWithAuthenticationSession:(NSURL *)url
{
Class AuthenticationSessionClass = fbsdkdfl_ASWebAuthenticationSessionClass();
if (!AuthenticationSessionClass) {
AuthenticationSessionClass = fbsdkdfl_SFAuthenticationSessionClass();
}
if (AuthenticationSessionClass != nil) {
if (_authenticationSession != nil) {
[FBSDKLogger singleShotLogEntry:FBSDKLoggingBehaviorDeveloperErrors
formatString:@"There is already a request for authenticated session. Cancelling active SFAuthenticationSession before starting the new one.", nil];
[_authenticationSession cancel];
}
_authenticationSession = [[AuthenticationSessionClass alloc] initWithURL:url
callbackURLScheme:[FBSDKInternalUtility appURLScheme]
completionHandler:_authenticationSessionCompletionHandler];
if (@available(iOS 13.0, *)) {
if ([_authenticationSession respondsToSelector:@selector(setPresentationContextProvider:)]) {
[_authenticationSession setPresentationContextProvider:self];
}
}
_isRequestingSFAuthenticationSession = YES;
[_authenticationSession start];
}
}
Basically Facebook is using ASWebAuthenticationSession for OAuth but somehow the [_authenticationSession start] went out and never returns, _authenticationSessionCompletionHandler never got triggered leaving the app hanging
Note that Facebook Login is working fine on Unity 2018.4.21f1 and older but breaks in 2018.4.22f1.
Any idea why and how to fix this?
SangCrowdstar
All 20 comments
I have the exact same problem. Using Unity 2019.3.13f1.
But I think it works with the Facebook 7.18.1
The problem appeared to me after upgrading to 7.19.2.
wagenheimer
on 8 May 2020
Encountered same problem with Unity 2019.3.9f1, we just upgraded to 7.19.2
iamAloTheGreat
on 8 May 2020
I have the exact same problem. Using Unity 2019.3.13f1.
But I think it works with the Facebook 7.18.1
The problem appeared to me after upgrading to 7.19.2.
Will try Facebook 7.18.1 if problem will not appear.
iamAloTheGreat
on 8 May 2020
I have the exact same problem. Using Unity 2019.3.13f1.
But I think it works with the Facebook 7.18.1
The problem appeared to me after upgrading to 7.19.2.Will try Facebook 7.18.1 if problem will not appear.
Update: tried with v7.18.1 works. Thanks @wagenheimer for the tip. Hope this will be fix soon in with the latest SDK version.
iamAloTheGreat
on 8 May 2020
Getting this exact issue on iOS 13.4, Unity 2019.3.13f1, both Facebook SDK 7.19.2 and 7.18.1 unfortunately. Clean Facebook SDK downgrade too. @iamAloTheGreat have you done anything besides downgrade the SDK to get it working?
aVolnov
on 12 May 2020
its still happening on Unity 2018.4.22f1 on both latest Facebook SDK and 7.18.1
SangCrowdstar
on 12 May 2020
Interesting that it flashes the webview for just a second regardless of whether Safari is logged in to FB or not too.
aVolnov
on 12 May 2020
I have same issue, it works in Unity 2019.3.7f but not 2019.3.13f1 and also not Unity 2020.1. I believe this is a Unity issue rather than Facebook issue.
I wrote on Unity Forum, please write there as well so that it gets visibility (https://forum.unity.com/threads/facebook-login-broken-in-unity-2019-3-13f1-but-works-in-2019-3-7f1.888502/).
Whyser
on 12 May 2020
Getting this exact issue on iOS 13.4, Unity 2019.3.13f1, both Facebook SDK 7.19.2 and 7.18.1 unfortunately. Clean Facebook SDK downgrade too. @iamAloTheGreat have you done anything besides downgrade the SDK to get it working?
@aVolnov Nope, I just tried to downgrade. But instead of importing 7.18.1 directly to the main project, I created a dummy project > imported 7.18.1 > deleted Facebook SDK folder and PlayServicesResolver in the main project (while Unity is closed) then paste the 2 folders from the dummy to the main. It somehow worked fine both iOS and Android.
iamAloTheGreat
on 12 May 2020
@iamAloTheGreat Are you still on Unity 2019.3.9? I've tried your method on .13 and it made no difference, still not working. Will try downgrading to .9 and see if it works. This is all 3 days after I culled old Unity installs, d'oh.
aVolnov
on 12 May 2020
Can confirm that the issue doesn't present after downgrading to 2019.3.9f1. No issues downgrading either, just had to delete the package cache from Library.
aVolnov
on 12 May 2020
@aVolnov Yes I'm on Unity 2019.3.9. Good to know that downgrading to .9 solved your issue. But I'm not really sure if the problem is with Unity or Facebook tho.
iamAloTheGreat
on 12 May 2020
I "fixed" this by adding a post-build processor
#if UNITY_IOS
[PostProcessBuild(999)]
public static void OnPostProcessBuild(BuildTarget buildTarget, string path)
{
string preprocessorPath = path + "/Classes/Preprocessor.h";
string text = File.ReadAllText(preprocessorPath);
text = text.Replace("UNITY_SNAPSHOT_VIEW_ON_APPLICATION_PAUSE 1", "UNITY_SNAPSHOT_VIEW_ON_APPLICATION_PAUSE 0");
File.WriteAllText(preprocessorPath, text);
}
#endif
hex
on 19 May 2020
hex's solution seems to work. Would you please explain what that UNITY_SNAPSHOT_VIEW_ON_APPLICATION_PAUSE does?
SangCrowdstar
on 21 May 2020
I "fixed" this by adding a post-build processor
#if UNITY_IOS [PostProcessBuild(999)] public static void OnPostProcessBuild(BuildTarget buildTarget, string path) { string preprocessorPath = path + "/Classes/Preprocessor.h"; string text = File.ReadAllText(preprocessorPath); text = text.Replace("UNITY_SNAPSHOT_VIEW_ON_APPLICATION_PAUSE 1", "UNITY_SNAPSHOT_VIEW_ON_APPLICATION_PAUSE 0"); File.WriteAllText(preprocessorPath, text); } #endif
Alternatively if you don't want to setup a post-processor the UNITY_SNAPSHOT_VIEW_ON_APPLICATION_PAUSE flag can be turned off simply by unticking the "Render extra frame on pause" option in the iOS Player Settings area.
mdobele
on 28 May 2020
same issue with Unity 2018.4.23f1, so I've back to 2018.4.17f1, now all works with latest facebook's sdk 7.19.2
korober
on 5 Jun 2020
issue is present in Unity2019.4.0f1 LTS UNITY_SNAPSHOT_VIEW_ON_APPLICATION_PAUSE false helped
gromilQaaaa
on 18 Jun 2020
Looks like I'm having the exact problem like @SangCrowdstar described. The webview displays for a split seconds then dismisses by itself and my game hangs.
macOS Catalina
Unity 2018.4.23f1
Facebook Unity SDK 7.20.0
Related issue? => https://github.com/facebook/facebook-sdk-for-unity/issues/289
I'm trying @mdobele's solution. Will keep posted.
p0w1nd
on 1 Jul 2020
I "fixed" this by adding a post-build processor
#if UNITY_IOS [PostProcessBuild(999)] public static void OnPostProcessBuild(BuildTarget buildTarget, string path) { string preprocessorPath = path + "/Classes/Preprocessor.h"; string text = File.ReadAllText(preprocessorPath); text = text.Replace("UNITY_SNAPSHOT_VIEW_ON_APPLICATION_PAUSE 1", "UNITY_SNAPSHOT_VIEW_ON_APPLICATION_PAUSE 0"); File.WriteAllText(preprocessorPath, text); } #endifAlternatively if you don't want to setup a post-processor the UNITY_SNAPSHOT_VIEW_ON_APPLICATION_PAUSE flag can be turned off simply by unticking the "Render extra frame on pause" option in the iOS Player Settings area.
Unticking "Render extra frame on pause" works for me. Facebook Login succeeded! Thanks.
macOS Catalina
Unity 2018.4.23f1
Facebook Unity SDK 7.20.0
p0w1nd
on 2 Jul 2020
I "fixed" this by adding a post-build processor
#if UNITY_IOS [PostProcessBuild(999)] public static void OnPostProcessBuild(BuildTarget buildTarget, string path) { string preprocessorPath = path + "/Classes/Preprocessor.h"; string text = File.ReadAllText(preprocessorPath); text = text.Replace("UNITY_SNAPSHOT_VIEW_ON_APPLICATION_PAUSE 1", "UNITY_SNAPSHOT_VIEW_ON_APPLICATION_PAUSE 0"); File.WriteAllText(preprocessorPath, text); } #endifAlternatively if you don't want to setup a post-processor the UNITY_SNAPSHOT_VIEW_ON_APPLICATION_PAUSE flag can be turned off simply by unticking the "Render extra frame on pause" option in the iOS Player Settings area.
Man, You just have saved my day, thanks for "Render extra frame on pause" option tips
armnotstrong
on 28 Sep 2020
Related issues
manofspirit
·
6Comments
charanjeet5ingh
·
6Comments
laijingfeng
·
6Comments
bblpny
·
4Comments
Duke74
·
4Comments
Most helpful comment
Alternatively if you don't want to setup a post-processor the UNITY_SNAPSHOT_VIEW_ON_APPLICATION_PAUSE flag can be turned off simply by unticking the "Render extra frame on pause" option in the iOS Player Settings area.