Login with Facebook and fetch email and user info for iOS 7

Question

I am newbie in iOS and I am working on app in which I need to integrate facebook with my App just for login purpose and to fetch user info on login user. I just read few tutorial but those are for sharing purpose, which I don't need those. I also want that if user login from facebook that should be save in settings (my client requirement)? Kindly suggest me few links. Thanks

Answer 1

You can implement it with Facebook SDK.

There are two ways to implement Facebook login in your iOS app: using the Facebook login button or implementing your custom login UI using API calls.

This is how you request for permissions for information to want to read.

FBLoginView *loginView = 
    [[FBLoginView alloc] initWithReadPermissions:
        @[@"public_profile", @"email"]];

When you implement FBLoginViewDelegate

// This method will be called when the user information has been fetched
- (void)loginViewFetchedUserInfo:(FBLoginView *)loginView
                            user:(id<FBGraphUser>)user {
  self.profilePictureView.profileID = user.id;
  self.nameLabel.text = user.name;
}

https://developers.facebook.com/docs/facebook-login/ios/v2.0

Above link has all you need with sample/example code.

If you don't want to use Facebook SDK. Same thing can be achieved using Social Framework.

SLRequest *request = [SLRequest requestForServiceType:SLServiceTypeFacebook
                                     requestMethod:SLRequestMethodGET
                                               URL:[NSURL URLWithString:@"https://graph.facebook.com/me"]
                                        parameters:nil];
request.account = _account; // This is the _account from your code
[request performRequestWithHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
    if (error == nil && ((NSHTTPURLResponse *)response).statusCode == 200) {
        NSError *deserializationError;
        NSDictionary *userData = [NSJSONSerialization JSONObjectWithData:data options:0 error:&deserializationError];

        if (userData != nil && deserializationError == nil) {
            NSString *email = userData[@"email"];
            NSLog(@"%@", email);
        }
    }
}]; 

Answer 2

In YourClass.h file.

#import <FacebookSDK/FacebookSDK.h>

@interface YourClass : UIViewController<FBLoginViewDelegate>

@property(nonatomic,retain) IBOutlet FBLoginView *loginFacebook;

In YourClass.m file.

@synthesize loginFacebook;

In ViewDidLoad

-(Void)ViewDidLoad
{

    loginFacebook =
        [[FBLoginView alloc] initWithPublishPermissions:[NSArray arrayWithObjects:@"email",@"user_friends",nil] defaultAudience:FBSessionDefaultAudienceFriends];

        for (id obj in loginFacebook.subviews)
        {
            if ([obj isKindOfClass:[UIButton class]])
            {
                UIButton * loginButton =  obj;

                UIImage *loginImage = [UIImage imageNamed:@"facebook-off.png"];
                [loginButton setBackgroundImage:loginImage forState:UIControlStateNormal];
                [loginButton setBackgroundImage:nil forState:UIControlStateSelected];
                [loginButton setBackgroundImage:nil forState:UIControlStateHighlighted];
                //[loginButton sizeToFit];
            }
            if ([obj isKindOfClass:[UILabel class]])
            {
                UILabel * loginLabel =  obj;
                loginLabel.text =@""; //@"Log in to facebook";
                loginLabel.textAlignment = NSTextAlignmentCenter;
                loginLabel.frame =CGRectMake(123,149, 280, 55);// CGRectMake(0, 0, 271, 37);
            }
        }

        loginFacebook.delegate = self;

        if (IsIphone5)
        {
            loginFacebook.frame =CGRectMake(29, 249, 263, 54);
        }
        else
        {
            loginFacebook.frame =CGRectMake(29, 240, 263, 54);
        }

        [self.view addSubview:loginFacebook];

      [Super ViewDidLoad];
 }

pragma mark Facebook

- (void)loginViewShowingLoggedInUser:(FBLoginView *)loginView
{

}
- (void)loginViewFetchedUserInfo:(FBLoginView *)loginView
                            user:(id<FBGraphUser>)user
{    
    Nslog(@"=== %@",User);
}
- (void)loginViewShowingLoggedOutUser:(FBLoginView *)loginView
{

    NSHTTPCookieStorage *cookieStorage = [NSHTTPCookieStorage sharedHTTPCookieStorage];
    FBSession* session = [FBSession activeSession];
    [session closeAndClearTokenInformation];
    //        [FBSession setActiveSession:nil];
    for (NSHTTPCookie *each in cookieStorage.cookies)
    {
        [cookieStorage deleteCookie:each];
    }
}
- (void)loginView:(FBLoginView *)loginView
      handleError:(NSError *)error
{
    NSLog(@"== %@",error.localizedDescription);
}