use FacebookComposeViewController ,but photo can't show - iphone

Question

I learned this Sample code, and try to implement in my app, but the photo can't show.
enter link description here
- (IBAction)facebookBtn_down:(id)sender {
if (osVer >= 6.0) {
SLComposeViewController *fbVC = [SLComposeViewController composeViewControllerForServiceType:SLServiceTypeFacebook];
[fbVC setInitialText:apple_F_MSG];
[fbVC addURL:[NSURL URLWithString:APP_URL]];
[fbVC setCompletionHandler:^(SLComposeViewControllerResult res) {
if (res == SLComposeViewControllerResultDone) [self AlertToukou];
}];
[self presentModalViewController:fbVC animated:YES];
} else {
DEFacebookComposeViewController *fbVC = [[[DEFacebookComposeViewController alloc] init] autorelease];
self.modalPresentationStyle = UIModalPresentationCurrentContext;
[fbVC setInitialText:apple_F_MSG];
[fbVC addURL:[NSURL URLWithString:APP_URL]];
[fbVC setCompletionHandler:^(DEFacebookComposeViewControllerResult res) {
if (res == DEFacebookComposeViewControllerResultDone) [self AlertToukou];
[self dismissModalViewControllerAnimated:YES];
self.modalPresentationStyle = UIModalPresentationFullScreen;
}];
[self presentModalViewController:fbVC animated:YES];
}
}
please give me some advice,thank you!

Answer 1

From the documentation page of that it says,
DEFacebookComposeViewController *facebookViewComposer = [[DEFacebookComposeViewController alloc] init];
self.modalPresentationStyle = UIModalPresentationCurrentContext;
[facebookViewComposer setInitialText:#"Look on this"];
[facebookViewComposer addImage:[UIImage imageNamed:#"1.jpg"]];//<------Check This
facebookViewComposer.completionHandler = completionHandler;
[self presentViewController:facebookViewComposer animated:YES completion:^{ }];
You should use addImage function and give proper UIImage object than it should be working.

Answer 2

I found the problem：
I did not set the Key "forKey:#"source",than can't post on the wall
errorError Domain=com.facebook.sdk Code=5 "The operation couldn’t be completed. (com.facebook.sdk error 5.)"
if ([self.images count] > 0) {
[d setObject:UIImagePNGRepresentation([self.images lastObject]) forKey:#""];
graphPath = #"me/photos";
}