升级Unity Facebook SDK后无法为iOS构建

Question

After upgrading to iOS9 the FB integration has seized to work with my app. To fix this, I updated the Facebook SDK (to version 7.2.2) to be used with Unity 4.6.9, and after the necessary changes the integration works fine in the editor.

But now I can't build the whole app to the device any more, as Xcode (version 7.1) It just giving me 19 errors similar to this:

Undefined symbols for architecture armv7: "_IOSLogInWithReadPermissions", referenced from: _IOSFacebook_IOSLogInWithReadPermissions_m971 in Bulk_Assembly-CSharp_0.o (maybe you meant: _IOSFacebook_IOSLogInWithReadPermissions_m971)

I've checked in the Facebook SDK documentation but it seems to me that it only tells me to update the plist file. But when I look at my plist file, it already looks like what is in the documentation.

How can I fix the undefined symbols error with Facebook SDK?

Answer 1

The issue is that starting with Facebook Unity SDK version 7.1.0 (September 21, 2015) they dropped support for Unity 4, see the Changelog and the first line of the Getting Started page.

BREAKING CHANGE: Unity 4 is no longer supported. Unity 5 is required

Anyhow the reason this breaks, that Unity 5 allows to put plugins somewhere else than in the Plugins folder, and Facebook Unity SDK uses that feature and put their Objectice-C code into Facebook/Editor/iOS .

You could try to move it into Plugins/iOS . But you might run into more issues....