Facebook SDK for iOS 6.0 native Share dialog - ios

Question

I've include the Facebook native Share dialog in my iOS app to let users share some data. The problem is, that the dialog does not open. Here is the code. Also, it is normal for me to pass URL of image to the method? Maybe, this is the problem?
BOOL displayedNativeDialog =
[FBNativeDialogs
presentShareDialogModallyFrom:self
initialText:activityName
image:activityImageURL
url:activityURL
handler:^(FBNativeDialogResult result, NSError *error) {
if (error) {
NSLOG(#"Error occured");
} else {
if (result == FBNativeDialogResultSucceeded) {
NSLOG(#"Success");
} else {
NSLOG(#"No success");
}
}
}];
if (!displayedNativeDialog) {
NSLOG("Window does notdisplayed");
}

Answer 1

Instead of
image:activityImageURL
pass the UIImage data to image
image:[UIImage imageWithNamed:#"blahblah"]

Answer 2

You can use Native Dialogs only when the user has the Facebook App installed. First check if the facebook app is available, then either display the native dialog or display the web dialog accordingly:
FBShareDialogParams *shareParams = [[FBShareDialogParams alloc] init];
shareParams.link = [NSURL URLWithString:#"http://some-url.com"];
shareParams.name = #"Post Name";
shareParams.picture= [NSURL URLWithString:someImageURL];
shareParams.description = #"Post Description";
if ([FBDialogs canPresentShareDialogWithParams:shareParams])
{
[FBDialogs presentShareDialogWithParams:shareParams
clientState:nil
handler:^(FBAppCall *call, NSDictionary *results, NSError *error) {
NSLog(#"%#", [error localizedDescription]);
}];
}
else
{
NSDictionary *params = #{
#"name" : shareParams.name,
#"description" : shareParams.description,
#"picture" : objectiveCharacterImageURL,
#"link" : linkURL
};
[FBWebDialogs presentFeedDialogModallyWithSession:nil
parameters:params
handler:^(FBWebDialogResult result, NSURL *resultURL, NSError *error) {
}];
}