Publishing picture to facebook page as admin - iphone

Question

I have problem publishing a photo from ios app to facebook page as the page's admin. The only thing I can publish as admin is a status message.
Here what I did.
// get access token first
[FBRequestConnection startWithGraphPath:#"/__facebook_page_id__?fields=access_token" completionHandler:^(FBRequestConnection *connection, id result, NSError *error) {
// make sure its not nil
if ([result valueForKey:#"access_token"] != nil) {
NSString *accessToken = [result objectForKey:#"access_token"];
NSLog(#"Access token: %#", accessToken);
NSMutableDictionary* params = [[NSMutableDictionary alloc] init];
[params setObject:#"This is some status message" forKey:#"message"];
[params setObject:accessToken forKey:#"access_token"];
[FBRequestConnection startWithGraphPath:#"/__facebook_page_id__/feed" parameters:params HTTPMethod:#"POST" completionHandler:^(FBRequestConnection *connection, id result, NSError *error) {
NSLog(#"Result: %#", result);
NSLog(#"Error: %#", error);
}];
}
}];
The above code successfully publish to facebook page as the admin. Since I need to publish a photo, I need to change the grap path to /facebook_page_id/photos.
NSMutableDictionary* params = [[NSMutableDictionary alloc] init];
[params setObject:UIImagePNGRepresentation(self.imagePreview.image) forKey:#"picture"];
[params setObject:#"This is some description" forKey:#"message"];
[params setObject:accessToken forKey:#"access_token"];
[FBRequestConnection startWithGraphPath:[NSString stringWithFormat:#"/__facebook_page_id__/photos"] parameters:params HTTPMethod:#"POST" completionHandler:^(FBRequestConnection *connection, id result, NSError *error) {
NSLog(#"Result: %#", result);
NSLog(#"Error: %#", error);
}];
The above code is successfully published, but not as admin. Eventhough I am using the page's access token.
I thought the path fb_page_id/photos was broken, so I tried to use the fb_page_id/feed and send other fields such as link, picture, etc. But still, it posted as the user, not the page's admin.
Please let me know if I am doing wrong.
Some Information:
- Deployment target: 5.1 and above
- Facebook SDK Version: 3.7
Thank you in advance.

Answer 1

I finally found the answer. Just in case somebody having the same problem, here is what I am doing.
You will need a Page's access_token by accessing /page_id?fields=access_token
[FBRequestConnection startWithGraphPath:[NSString stringWithFormat:#"/%#?fields=access_token", FB_PAGE_ID] completionHandler:^(FBRequestConnection *connection, id result, NSError *error) {
// if the access_token is not there, the user might not able to post. check the permission
if ([result valueForKey:#"access_token"] != nil) {
NSString *accessToken = [result objectForKey:#"access_token"];
}
}];
After getting the Page's access_token, you need to post the image using REST API. Here I am using AFNetworking, and manually upload the image.
if ([result valueForKey:#"access_token"] != nil) {
NSString *accessToken = [result objectForKey:#"access_token"];
NSURL *url = [NSURL URLWithString:#"https://graph.facebook.com"];
AFHTTPClient *client = [AFHTTPClient clientWithBaseURL:url];
// parameter
NSDictionary *params = #{#"access_token": accessToken, #"message": message};
// image data
NSData *imageData = UIImageJPEGRepresentation(self.imagePreview.image, 1);
// create Request and upload the image
NSMutableURLRequest *request = [client multipartFormRequestWithMethod:#"POST" path:[NSString stringWithFormat:#"/%#/photos/", [defaults stringForKey:#"fb_page_id"]] parameters:params constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
[formData appendPartWithFileData:imageData name:#"source" fileName:accessToken mimeType:#"image/jpeg"];
}];
// publish!
AFJSONRequestOperation *json = [AFJSONRequestOperation JSONRequestOperationWithRequest:request1 success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {
// IMAGE PUBLISHED!!!
} failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) {
// SOMETHING WRONG HAPPEN
}];
[json start];
}
Don't ask me why I'm using REST API, I tried everything using their SDK, but its always failed.
I hope somebody will find it usefull for this piece of codes.