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我想将图像分享到 Facebook，我正在使用以下代码：

if ([SLComposeViewController isAvailableForServiceType:SLServiceTypeFacebook]) {
    slComposeViewController = [SLComposeViewController composeViewControllerForServiceType:SLServiceTypeFacebook];
    [slComposeViewController addImage:[UIImage imageNamed:@"BottletoBottle.jpg"]];
    [slComposeViewController addURL:[NSURL URLWithString:facebookURL]];
    [slComposeViewController setInitialText:facebookstarRating];
    [self presentViewController:slComposeViewController animated:YES completion:NULL];

}else{
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Facebook Alert" message:@"You have no facebook account signed in" delegate:self cancelButtonTitle:@"Dismiss" otherButtonTitles:nil, nil];
    [alert show];
}

这样，代码可以完美运行，但我想替换该行：

[slComposeViewController addImage:[UIImage imageNamed:@"BottletoBottle.jpg"]];

和：

NSString *facebookImageName = @"BottletoBottle.jpg";
[slComposeViewController addImage:[UIImage imageNamed:facebookImageName]];

但它不工作。你能帮我解释一下为什么这个设置不起作用。非常感谢

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