iOS iOS 6 not posting image to Facebook via UIActivity

[troop231]

My console throws this error when attaching an image to send via Facebook:

<Error>: CGImageCreate: invalid image size: 0 x 0.

The same image works fine while sending to Twitter also via UIActivity. The Facebook image doesn't work on the device or the simulator, and shows a safari type icon.

Pic of issue:

I appreciate any help offered.

EDIT: The issue only happens when I attach a url along with the image.

Here is my code:

- (void)test
{
    NSString *textItem = @"Check out the app:";
    UIImage *imageToShare = [UIImage imageNamed:@"test.png"];
    NSURL *url = [NSURL URLWithString:@"http://applinkhere"];
                    
    CustomProvider *customProvider =
                    [[CustomProvider alloc]init];
                    NSArray *items = [NSArray arrayWithObjects:customProvider,textItem,imageToShare,url,nil];
                    
    CustomActivity *ca = [[CustomActivity alloc]init];
                    UIActivityViewController *activityVC =
                    [[UIActivityViewController alloc] initWithActivityItems:items
                                                      applicationActivities:[NSArray arrayWithObject:ca]];
                    
 activityVC.excludedActivityTypes = @[UIActivityTypePostToWeibo, UIActivityTypeAssignToContact, UIActivityTypePrint, UIActivityTypeCopyToPasteboard, UIActivityTypeSaveToCameraRoll];
                    
 activityVC.completionHandler = ^(NSString *activityType, BOOL completed)
 {
                        NSLog(@" activityType: %@", activityType);
                        NSLog(@" completed: %i", completed);
 };
                    
        if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
 {
       self.popoverController = [[UIPopoverController alloc] initWithContentViewController:activityVC];
                        
       CGRect rect = [[UIScreen mainScreen] bounds];

       [self.popoverController
       presentPopoverFromRect:rect inView:self.view
       permittedArrowDirections:0
       animated:YES];
 }
 else
       {
            [self presentViewController:activityVC animated:YES completion:nil];
        }
}

 

[Duncan C]

My console throws this error when attaching an image to send via Facebook:

<Error>: CGImageCreate: invalid image size: 0 x 0.

The same image works fine while sending to Twitter also via UIActivity. The Facebook image doesn't work on the device or the simulator, and shows a safari type icon.

Pic of issue:
Image

I appreciate any help offered.

EDIT: The issue only happens when I attach a url along with the image.

A suggestion for your post: Don't call the class you're using "UIActivity". There is no class in iOS with that name. Looking at your code I can tell that you're using the new-to-iOS-6 class UIActivityViewController.

I would suggest using the full UIActivityViewController class name in your post title, and also indicate that it's a new iOS 6 framework. If you do that you're more likely to attract the attention of somebody who's used that class.

My business partner is the social media expert for our company. He's written a social media wrapper that offers the same function in iOS 5 and 6, and I use that. Thus, I can't offer any help with using UIActivityViewController.

 

[troop231]

Problem solved!

It appears it that Twitter and FB both handle the url formatting, and this works:

NSString *textItem = @"Check out the yourappnamehere app: http://itunes.apple.com/us/app/yourapplink";
                    UIImage *imageToShare = [UIImage imageNamed:@"someimage.png"];

CustomProvider *customProvider =
                    [[CustomProvider alloc]init];
                    NSArray *items = [NSArray arrayWithObjects:customProvider,textItem,imageToShare,nil];
                    
                    CustomActivity *ca = [[CustomActivity alloc]init];
                    
                    UIActivityViewController *activityVC =
                    [[UIActivityViewController alloc] initWithActivityItems:items
                                                      applicationActivities:[NSArray arrayWithObject:ca]];
                    
                    activityVC.excludedActivityTypes = @[UIActivityTypePostToWeibo, UIActivityTypeAssignToContact, UIActivityTypePrint, UIActivityTypeCopyToPasteboard, UIActivityTypeSaveToCameraRoll];