share with Facebook from an iOS app

It's amazing to share the experience of one with an app on facebook.  Now it's very easy to integrate social media in iOS app.

To post content, photo or share stories on facebook from an iOS app, Facebook provide the SDK with full support of all the major functionality it have. By using it;s SDK we can directly login to facebook, post data on the timeline or other friends wall and can share the link, photo and posts.

To include these functionality in our app.. some configuration is required.

1) Install the Facebook SDK : Download the latest version of SDK from developers site and install it.

2) Create a facebook app:  First we need to registered as developer on facebook. Then create a facebook  app on developer's site.

and fill in each section for app

• Bundle ID - iOS Bundle ID that corresponds to your app.
• iPhone App Store ID - App Store ID.
• iPad App Store ID -iPad App Store ID if your app is in the store.

3) Configure the Xcode Project:  

     A) Add the SDK for iOS project and add required framework to app.

    

     B)  Edit the .plist file.

       1.Create a key called FacebookAppID with a string value, and add the app ID there.

       2.Create a key called FacebookDisplayName with a string value, and add the Display              Name we  configured in the App Dashboard.

       3.Create an array key called URL types with a single array sub-item called URL Schemes. Give               this a single item with your app ID prefixed with fb.

          This is used to ensure the application will receive the callback URL of the web-based OAuth flow.

4)   In appDelegate.m, add the following code:

               #import <FBSDKCoreKit/FBSDKCoreKit.h>

               #import <FBSDKLoginKit/FBSDKLoginKit.h>

- (BOOL)application:(UIApplication *)application openURL:(NSURL* )url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation {

    

    return [[FBSDKApplicationDelegate sharedInstance] application:application

                                                          openURL:url

                                                sourceApplication:sourceApplication

                                                       annotation:annotation];

}

- (void)applicationDidBecomeActive:(UIApplication *)application {

    [FBSDKAppEvents activateApp];

}

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

return [ [FBSDKApplicationDelegate sharedInstance] application :application

                 didFinishLaunchingWithOptions:launchOptions]

  }

5) Now our project is configured, we can add different functionality  to our app:

    Sharing

    LogIn With Facebook

    App Events

   Graph API calls

To login with facebook, import the required files and add this code

FBSDKLoginManager *login = [[FBSDKLoginManager alloc] init];

   

[login logInWithReadPermissions:@[@"public_profile", @"email", @"user_friends"] handler:^(FBSDKLoginManagerLoginResult *result, NSError *error) {

        

          if (error) {

            

       // Process error

        }

         else if (result.isCancelled) {

           

            // Handle cancellations

        } 

          else {

            

            // If you ask for multiple permissions at once, you

            // should check if specific permissions missing

              

                      if ([result.grantedPermissions containsObject:@"email"]) {

                      

                          NSLog(@"%@",result);

                          // Do work

                      }

                }

    }];

To share photo on facebook, your controller must conform to  <FBSDKSharingDelegate> to handle different state in sharing

//build your photo content

   

    FBSDKSharePhoto *photo = [[FBSDKSharePhoto alloc]init];

    photo.image = [UIImage imageNamed:@"tom.jpg"];

    photo.userGenerated = YES;

    

    FBSDKSharePhotoContent *content = [[FBSDKSharePhotoContent alloc]init];

    content.photos = @[photo];

    

    FBSDKShareDialog *shareFB = [[FBSDKShareDialog alloc] init];

    

    if ([shareFB canShow]) {

    shareFB.shareContent = content;

    

    shareFB.delegate = self;

    [shareFB show];

    }

    else{

        

        UIAlertView * alert = [[UIAlertView alloc]initWithTitle:@"Error" message:@"can't show the share dialog box" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil ];

        

        [alert show];

        

    }

and add the delegate method

#pragma mark === delegate method

- (void)sharer:(id<FBSDKSharing>)sharer didCompleteWithResults:(NSDictionary *)results

{

    NSLog(@"completed share:%@", results);

}

- (void)sharer:(id<FBSDKSharing>)sharer didFailWithError:(NSError *)error

{

    NSLog(@"sharing error:%@", error);

    NSString *message = error.userInfo[FBSDKErrorLocalizedDescriptionKey] ?:

    @"There was a problem sharing, please try again later.";

    NSString *title = error.userInfo[FBSDKErrorLocalizedTitleKey] ?: @"Oops!";

    

    [[[UIAlertView alloc] initWithTitle:title message:message delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil] show];

}

- (void)sharerDidCancel:(id<FBSDKSharing>)sharer

{

    NSLog(@"share cancelled");

}

That's so simple with FBSDK to include the functionality of facebook in our app.