Since the last set of Facebook tutorials that I created there has been some changes to the SDK. We’re now on 7.3.0 at the time I write this post.

Some of the more notable changes are the new IResult replacing FBResult, FB.LogInWithReadPermissions as the new way of initialising the first login.

In the video tutorial I mentioned about the OnGUI bug which is currently in Facebook SDK 7.3.0 which I know has plagued some of you while trying to make my previous tutorials work. To be exact that bug is:

ArgumentException: You can only call GUI functions from inside OnGUI.

Facebook have mentioned they will fix this in the next release of the SDK. So for now we have to use a work around so we can carry on working!

To fix this, open up FacebookSDK/SDK/Scripts/PlatformEditor/EditorFacebookMockDialog.cs and find:

public void OnGUI(){

Then insert the following code after that line – so that it’s the first code inside of OnGUI:

if ( this.modalStyle == null )
{
	this.modalRect = new Rect(10, 10, Screen.width - 20, Screen.height - 20);
	this.modalStyle = new GUIStyle(GUI.skin.window);
	Texture2D texture = new Texture2D(1, 1);
	texture.SetPixel(0, 0, new Color(0.2f, 0.2f, 0.2f, 1.0f));
	texture.Apply();
	this.modalStyle.normal.background = texture;
}

After doing this you will still get a small error, but it’s ignorable since it doesn’t actually break anything.

I hope the tutorial helps, let me know in the forums if there are any bugs!

Here’s the full code from FBscript.cs for your convenience:

using UnityEngine;
using UnityEngine.UI;
using System.Collections;
using System.Collections.Generic;
using Facebook.Unity;

public class FBscript : MonoBehaviour {

	public GameObject DialogLoggedIn;
	public GameObject DialogLoggedOut;
	public GameObject DialogUsername;
	public GameObject DialogProfilePic;

	void Awake()
	{
		FB.Init (SetInit, OnHideUnity);
	}

	void SetInit()
	{

		if (FB.IsLoggedIn) {
			Debug.Log ("FB is logged in");
		} else {
			Debug.Log ("FB is not logged in");
		}

		DealWithFBMenus (FB.IsLoggedIn);

	}

	void OnHideUnity(bool isGameShown)
	{

		if (!isGameShown) {
			Time.timeScale = 0;
		} else {
			Time.timeScale = 1;
		}

	}

	public void FBlogin()
	{

		List<string> permissions = new List<string> ();
		permissions.Add ("public_profile");

		FB.LogInWithReadPermissions (permissions, AuthCallBack);
	}

	void AuthCallBack(IResult result)
	{

		if (result.Error != null) {
			Debug.Log (result.Error);
		} else {
			if (FB.IsLoggedIn) {
				Debug.Log ("FB is logged in");
			} else {
				Debug.Log ("FB is not logged in");
			}

			DealWithFBMenus (FB.IsLoggedIn);
		}

	}

	void DealWithFBMenus(bool isLoggedIn)
	{

		if (isLoggedIn) {
			DialogLoggedIn.SetActive (true);
			DialogLoggedOut.SetActive (false);

			FB.API ("/me?fields=first_name", HttpMethod.GET, DisplayUsername);
			FB.API ("/me/picture?type=square&height=128&width=128", HttpMethod.GET, DisplayProfilePic);

		} else {
			DialogLoggedIn.SetActive (false);
			DialogLoggedOut.SetActive (true);
		}

	}

	void DisplayUsername(IResult result)
	{

		Text UserName = DialogUsername.GetComponent<Text> ();

		if (result.Error == null) {

			UserName.text = "Hi there, " + result.ResultDictionary ["first_name"];

		} else {
			Debug.Log (result.Error);
		}

	}

	void DisplayProfilePic(IGraphResult result)
	{

		if (result.Texture != null) {

			Image ProfilePic = DialogProfilePic.GetComponent<Image> ();

			ProfilePic.sprite = Sprite.Create (result.Texture, new Rect (0, 0, 128, 128), new Vector2 ());

		}

	}

}

If this tutorial helped please share it! If you would like to be notified when I release new tutorials then subscribe to my email list (the subscribe box is in the sidebar). Lastly, if you would like to help me then you can become a Patron at patreon.com/greyzoned.

Until next time, Happy Coding!

Glenn