How to post or share in Facebook iOS SDK?

Question

I'm trying to post a message or share a photo in my fb using FacebookSDK. I already follow the steps on how to install it. I'm done applying the login tutorial, but the problem now is how to post a message or share it into my FB using my app. There are a lot of tutorial like this one. I think this is already old for FacebookSDK. Sorry If I'm so noob for this. I know this not the right page to post this, but I don't have any idea now. If you have a tutorial on how to post or share. Please give me link. If ever, can you provide steps for this.

I already try this, but It doesn't post or share.

UPdate

this is my code

import "ShareController.h"
#import <FBSDKShareKit/FBSDKShareKit.h>
#import <FBSDKMessengerShareKit/FBSDKMessengerShareKit.h>


@implementation ShareController

- (void)viewDidLoad {
    [super viewDidLoad];

    FBSDKShareLinkContent *content = [[FBSDKShareLinkContent alloc] init];
    content.contentURL = [NSURL URLWithString:@"https://developers.facebook.com"];

    FBSDKShareButton *button = [[FBSDKShareButton alloc] init];
    button.shareContent = content;
    [self.view addSubview:button];
}

- (IBAction)shareButton:(id)sender {


    UIImage * image = [UIImage imageNamed:@"sample.png"];

    FBSDKSharePhoto *photo = [[FBSDKSharePhoto alloc] init];
    photo.image = image;
    photo.userGenerated = YES;
    FBSDKSharePhotoContent *content = [[FBSDKSharePhotoContent alloc] init];
    content.photos = @[photo];

    FBSDKShareDialog *dialog = [[FBSDKShareDialog alloc] init];
    dialog.fromViewController = self;
    dialog.shareContent= content;
    dialog.mode = FBSDKShareDialogModeShareSheet;
    [dialog show];
}

here's the code for my login. I think this is simple code

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    FBSDKLoginButton *loginButton = [[FBSDKLoginButton alloc] init];
    loginButton.center = self.view.center;
    [self.view addSubview:loginButton];
    // Do any additional setup after loading the view, typically from a nib.
}

Answer 1

You did not set permissions, to set the permissions:

FBSDKLoginButton *loginButton = [[FBSDKLoginButton alloc] init];
loginButton.center = self.view.center;
[loginButton logInWithPublishPermissions: @[@"publish_actions"] fromViewController:self handler:^(FBSDKLoginManagerLoginResult *result, NSError *error) {
if (error) {
  NSLog(@"Process error");
} else if (result.isCancelled) {
  NSLog(@"Cancelled");
} else {
  NSLog(@"Logged in");
  }
}];

Also it is a good practice to check if user has granted the permission or not in your IBAction method:

- (IBAction)shareButton:(id)sender {
if ([[FBSDKAccessToken currentAccessToken] hasGranted:@"publish_actions"])
{
    // code to share 
}
}