How to share photos to Facebook in Objective-C?

Question

I want to share photos upon my custom button click, am able to share links and messages but when it comes to the sharing of photos am not able to do.

I am using latest Facebook SDK framework (4.15.1).

This is my code in inside the button click.

 - (IBAction)btnsharecustom:(id)sender {

//Get aws s3 Image.
NSString* strS3ImageURL = @"https://TEST_IMAGE_URL/1473497380077.jpg";

//Convert to URL.
NSURL* url1 = [NSURL URLWithString:strS3ImageURL];

//Convert it into data.
NSData* data = [NSData dataWithContentsOfURL:url1];

//Convert it to image.
UIImage* image = [UIImage imageWithData:data];    

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

photo.image = image;
photo.caption = @"Test Caption";
photo.userGenerated = YES;

FBSDKSharePhotoContent *content = [[FBSDKSharePhotoContent alloc] init];
content.photos = @[photo];
}

I included this code in app delegate.

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.

[[FBSDKApplicationDelegate sharedInstance] application:application
                         didFinishLaunchingWithOptions:launchOptions];    

return YES;
}

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

BOOL handled = [[FBSDKApplicationDelegate sharedInstance] application:application
                                                              openURL:url
                                                    sourceApplication:sourceApplication
                                                           annotation:annotation
                ];
// Add any custom logic here.
return handled;
}

Also included this code in info.plist

    <dict>
        <key>CFBundleURLSchemes</key>
        <array>
            <string>fb15771408xxx409xx</string>
        </array>
    </dict>

<key>FacebookAppID</key>
<string>15771408xxx409xx</string>
<key>FacebookDisplayName</key>
<string>Cedar iOS</string>
<key>LSApplicationQueriesSchemes</key>
<array>
    <string>fbapi</string>
    <string>fb-messenger-api</string>
    <string>fbauth2</string>
    <string>fbshareextension</string>
    <string>fbapi20130214</string>
    <string>fbapi20130410</string>
    <string>fbapi20130702</string>
    <string>fbapi20131010</string>
    <string>fbapi20131219</string>
    <string>fbapi20140410</string>
    <string>fbapi20140116</string>
    <string>fbapi20150313</string>
    <string>fbapi20150629</string>
    <string>fbapi20160328</string>
    <string>fbauth</string>
    <string>fb-messenger-api20140430</string>
</array>

When I click upon my custom button Facebook App or safari browser is not launching, so can anyone tell me what I am missing here?

Answer 1

You should present the dialog yourself after modelling the content.

Add this

[FBSDKShareDialog showFromViewController:self
                          withContent:content
                             delegate:nil];

to the end of your - (IBAction)btnsharecustom:(id)sender method.

---

Note: It will take time to download your image because it uses synchronous request.

//Convert it into data.
NSData* data = [NSData dataWithContentsOfURL:url1];

Read the documentation here https://developer.apple.com/reference/foundation/nsdata/1547245-datawithcontentsofurl

Do not use this synchronous method to request network-based URLs. For network-based URLs, this method can block the current thread for tens of seconds on a slow network, resulting in a poor user experience, and in iOS, may cause your app to be terminated.

A solution for this problem can be by downloading your image asynchronously before user tap button (if the image to upload is predictable). Usually you can do this in viewDidLoad method. Try this https://github.com/rs/SDWebImage library to make it easy for async request image.

Answer 2

try this code.

- (IBAction)btnsharecustom:(id)sender {

    //Get aws s3 Image.
    NSString* strS3ImageURL = @"https://placeholdit.imgix.net/~text?txtsize=15&txt=image1&w=120&h=120";

    //Convert to URL.
    NSURL* url1 = [NSURL URLWithString:strS3ImageURL];

    //Convert it into data.
    NSData* data = [NSData dataWithContentsOfURL:url1];

    //Convert it to image.
    UIImage* image = [UIImage imageWithData:data];

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

    photo.image = image;
    photo.caption = @"Test Caption";
    photo.userGenerated = YES;

    FBSDKSharePhotoContent *content = [[FBSDKSharePhotoContent alloc] init];
    content.photos = @[photo];
    [FBSDKShareAPI shareWithContent:content delegate:self];
;
}
- (void)sharer:(id<FBSDKSharing>)sharer didCompleteWithResults:(NSDictionary *)results{

}

Answer 3

import

// Delegate FBSDKSharingDelegate

-(void)shareImageWithFacebook:(UIImage *)image { if(![[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:@"fb://"]]) { //Your device doesn't have Facebook app. return; }

FBSDKSharePhoto *photo = [FBSDKSharePhoto alloc];
photo.image = _imageSaved;
[photo setUserGenerated:YES];
photo.caption = AppName;
FBSDKSharePhotoContent *photoContent = [FBSDKSharePhotoContent alloc];
photoContent.photos = @[photo];

FBSDKShareDialog *dialog = [[FBSDKShareDialog alloc] init];
dialog.fromViewController = self;
dialog.delegate = self;
dialog.shareContent = photoContent;
[dialog show];

}

pragma mark- FBShareKit Delegate

• (void)sharer:(id)sharer didCompleteWithResults:(NSDictionary *)results { }
• (void)sharer:(id)sharer didFailWithError:(NSError *)error { }
• (void)sharerDidCancel:(id)sharer { }