IOS - Facebook SDK fbDidLogin not called -- initialize view controllers. - ios

Question

I followed the Facebook SDK tutorial from Facebook step by step. I have everything working besides fbDidLogin getting called... the authorization process works fine. I've been told to do:
- (BOOL)application:(UIApplication *)application handleOpenURL:(NSURL *)url {
return [[controller facebook] handleOpenURL:url];
}
from fbDidLogin not called
the problem is is that I'm not exactly sure how to alloc init my view controller. Here is my .h for app delegate:
#import <UIKit/UIKit.h>
#import "FBConnect.h"
#interface fb2AppDelegate : UIResponder <UIApplicationDelegate, FBSessionDelegate> {
Facebook *facebook;
UIViewController *fb2ViewController;
}
#property (strong, nonatomic) UIWindow *window;
#property (strong,nonatomic) Facebook *facebook;
#property (nonatomic, strong) UIViewController *fb2ViewController;
#end
and the .m :
#import "fb2AppDelegate.h"
#implementation fb2AppDelegate
#synthesize window = _window;
#synthesize facebook;
#synthesize fb2ViewController;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.fb2ViewController = [[UIViewController alloc] init];
facebook = [[Facebook alloc] initWithAppId:#"key_here" andDelegate:self];
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
if ([defaults objectForKey:#"FBAccessTokenKey"]
&& [defaults objectForKey:#"FBExpirationDateKey"]) {
facebook.accessToken = [defaults objectForKey:#"FBAccessTokenKey"];
facebook.expirationDate = [defaults objectForKey:#"FBExpirationDateKey"];
}
if (![facebook isSessionValid]) {
[facebook authorize:nil];
}
return YES;
}
- (BOOL)application:(UIApplication *)application handleOpenURL:(NSURL *)url {
return [[fb2ViewController facebook] handleOpenURL:url];
}
- (void)fbDidLogin {
NSLog(#"fbdidlogin");
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:[facebook accessToken] forKey:#"FBAccessTokenKey"];
[defaults setObject:[facebook expirationDate] forKey:#"FBExpirationDateKey"];
[defaults synchronize];
NSMutableDictionary* params = [NSMutableDictionary dictionaryWithObjectsAndKeys:
#"key_here", #"app_id",
#"http://developers.facebook.com/docs/reference/dialogs/", #"link",
#"http://fbrell.com/f8.jpg", #"picture",
#"Facebook Dialogs", #"name",
#"Reference Documentation", #"caption",
#"Using Dialogs to interact with users.", #"description",
nil];
[facebook dialog:#"feed" andParams:params andDelegate:self];
}
as for the view controllers... I haven't put any code in them.
the error that I am receiving is:
no visible #interface for 'UIViewController' declares the selector 'Facebook'
what am i doing wrong?
thx!

Answer 1

Okay, You need to do:
[facebook handleOpenURL:url].
You are currently using facebook as a selector instead of an object.
Also.. you need to set facebook.sessionDelegate = self, so that the delegate method fbDidLogin can get called.
Hope this helps!

Answer 2

The problem is that the runtime believes that your UIViewController has the class method +facebook, when in reality, that was an example singleton the other question's answer used (rather confusingly I might add). You need to send it to an instance of the Facebook object and call your code from there.
- (BOOL)application:(UIApplication *)application handleOpenURL:(NSURL *)url {
return [facebook handleOpenURL:url];
}
Also remember that in order for delegate methods to be called, your objects actually has to be a delegate. So set facebook.sessionDelegate = self and conform to the protocol in the header with <FBSessionDelegate> to silence the compiler warnings.