New Facebook SDK in iOS is a great built-in feature for the iOS apps developer.
Add this Framework header in your AppDelegate.h file (don't forget to add the Facebook framework).
#import "FacebookSDK/FacebookSDK.h" // Please replace the double quote (") with ('<' and '>')
Add this line to your AppDelegate.h file
extern NSString *const FBSessionStateChangedNotification;
Add this method declaration in your AppDelegate.h file
- (BOOL)openSessionWithAllowLoginUI:(BOOL)allowLoginUI;
Add these codes in your AppDelegate.m file
NSString *const FBSessionStateChangedNotification =
@"com.yourCompany.yourAppName:FBSessionStateChangedNotification";
- (BOOL)application:(UIApplication *)application
openURL:(NSURL *)url
sourceApplication:(NSString *)sourceApplication
annotation:(id)annotation
{
NSLog(@"url: %@",url);
return [FBSession.activeSession handleOpenURL:url];
}
/*
* Callback for session changes.
*/
- (void)sessionStateChanged:(FBSession *)session
state:(FBSessionState) state
error:(NSError *)error
{
switch (state) {
case FBSessionStateOpen:
if (!error) {
// We have a valid session
NSLog(@"User session found");
}
break;
case FBSessionStateClosed:
case FBSessionStateClosedLoginFailed:
[FBSession.activeSession closeAndClearTokenInformation];
break;
default:
break;
}
[[NSNotificationCenter defaultCenter]
postNotificationName:FBSessionStateChangedNotification
object:session];
if (error) {
UIAlertView *alertView = [[UIAlertView alloc]
initWithTitle:@"Error"
message:error.localizedDescription
delegate:nil
cancelButtonTitle:@"OK"
otherButtonTitles:nil];
[alertView show];
}
}
/*
* Opens a Facebook session and optionally shows the login UX.
*/
- (BOOL)openSessionWithAllowLoginUI:(BOOL)allowLoginUI
{
return [FBSession openActiveSessionWithPermissions:permissions
allowLoginUI:allowLoginUI
completionHandler:^(FBSession *session,
FBSessionState state,
NSError *error) {
[self sessionStateChanged:session
state:state
error:error];
}];
}
// Add the following code inside applicationDidBecomeActive: method
if (FBSession.activeSession.state == FBSessionStateCreatedOpening) {
[FBSession.activeSession close]; // so we close our session and start over
}
// Now it's time to work on your view controller. Add the following observer inside the viewDidLoad: method of your view controller, where you want to share something:
[[NSNotificationCenter defaultCenter]
addObserver:self
selector:@selector(sessionStateChanged:)
name:FBSessionStateChangedNotification
object:nil];
// Here is the call back method for the notification observer
- (void)sessionStateChanged:(NSNotification*)notification {
if (FBSession.activeSession.isOpen) {
//[self.authButton setTitle:@"Logout" forState:UIControlStateNormal];
NSLog(@"State Open");
}
else {
//[self.authButton setTitle:@"Login" forState:UIControlStateNormal];
NSLog(@"State Closed");
}
}
// Here is your facebook button's action:
-(IBAction)facebookButtonPressed
{
// you need to create the instance for your AppDelegate
AppDelegate *appDelegate = (AppDelegate*)[[UIApplication sharedApplication] delegate];
[appDelegate openSessionWithAllowLoginUI:YES];
}
*** If you want to login into your application with facebook login, you need to create an application at developer.facebook.com/apps
*** Will post more functionality (post image, status, link, etc) later
