Facebook Integration In iPhone

Introduction

In this article I will create a Single View application. Here I use an image view and two buttons from outlet. In this app I will implement uploading an image to Facebook. For this we implement an image gallery path from which we pick an image and upload it to Facebook. Finally we test this app in a device. It was successfully uploaded to Facebook.

To understand it we use the following.

Step 1

Here first we add the framework Social that is required to implement the Facebook integration.

To import this framework we use the following.

Step 2

Click on the project and select Build Phase.

Step 3

Click on the "+" icon to add the framework.

Step 4

Now select the Social framework and click on the "Add" button.

Step 5

To pick an image from the image gallery we need one more framework; MobileCoreService.

Step 6

Now we write the code for each class.

FBAppDelegate.h

#import <UIKit/UIKit.h>
@class FBViewController;
@interface FBAppDelegate : UIResponder <UIApplicationDelegate>
@property (strong, nonatomic) UIWindow *window;
@property (strong, nonatomic) FBViewController *viewController;
@end

FBAppDelegate.m

#import "FBAppDelegate.h"
#import "FBViewController.h"

@implementation FBAppDelegate
- (void)dealloc
{
[_window release];
[_viewController release];
[super dealloc];
}
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
// Override point for customization after application launch.
self.viewController = [[[FBViewController alloc] initWithNibName:@"FBViewController" bundle:nil] autorelease];
self.window.rootViewController = self.viewController;
[self.window makeKeyAndVisible];
return YES;
}
@end

FBViewController.h

#import <UIKit/UIKit.h>
#import <Social/Social.h>
#import <MobileCoreServices/MobileCoreServices.h>

@interface FBViewController : UIViewController <UIImagePickerControllerDelegate, UINavigationControllerDelegate>
@property (strong, nonatomic) IBOutlet UIImageView *imageView;
@property (strong, nonatomic) SLComposeViewController *PostView;
-(IBAction)preview;
-(IBAction)selectImage;
@end

FBViewController.m

#import "FBViewController.h"
@interface FBViewController ()
@end
@implementation FBViewController
@synthesize PostView, imageView;
- (void) preview
{
if ([SLComposeViewController isAvailableForServiceType:SLServiceTypeFacebook])
{
SLComposeViewController*fvc = [SLComposeViewController composeViewControllerForServiceType:SLServiceTypeFacebook];
[fvc setInitialText:@"My Name is Rock Star"];
[fvc addImage:imageView.image];
[self presentViewController:fvc animated:YES completion:nil];
}
}
- (void) selectImage
{
if ([UIImagePickerController isSourceTypeAvailable:
UIImagePickerControllerSourceTypeSavedPhotosAlbum])
{
UIImagePickerController *imagePicker =
[[UIImagePickerController alloc] init];
imagePicker.delegate = self;
imagePicker.sourceType =
UIImagePickerControllerSourceTypePhotoLibrary;
imagePicker.mediaTypes = [NSArray arrayWithObjects:
(NSString *) kUTTypeImage,
nil];
imagePicker.allowsEditing = NO;
[self presentViewController:imagePicker animated:YES completion:nil];
}
}

-(void)imagePickerController:(UIImagePickerController *)picker
didFinishPickingMediaWithInfo:(NSDictionary *)info
{
NSString *mediaType = [info
objectForKey:UIImagePickerControllerMediaType];
[self dismissViewControllerAnimated:YES completion:nil];
if ([mediaType isEqualToString:(NSString *)kUTTypeImage]) {
UIImage *image = [info
objectForKey:UIImagePickerControllerOriginalImage];
imageView.image = image;
}
}
-(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
[self dismissViewControllerAnimated:YES completion:nil];
}
@end