UIPrintInteractionController in iPad is giving me two warnings

Question

I am using a code to get Airprint in my app to print the current view as an image. the Airprint dialog pops up but in the log screen it shows me two warnings :

1) WARNING: Calling -[UIPrintInteractionController presentAnimated:completionHandler:] on iPad failed to find PDF header: `%PDF' not found.

2)[UIPopoverController_commonPresentPopoverFromRect: inView:permittedArrowDirections:animated:]: the rect passed in to this method must have non-zero width and height. This will be an exception in a future release.

I have already searched in the net but found that all solutions provided for regular rect Button

what I am using here is a segmented control, and I don't know how to use this control in this situation

here is the segment control code :

- (IBAction)legalSegment:(id)sender {


switch (((UISegmentedControl *)sender).selectedSegmentIndex) {
    case 0:
    {
        [self printItem];
        break;
    }
}

and this is the printItem method :

-(void)printItem {
CGRect rect = CGRectMake(0, 0, 768, 1004);
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
[self.view.layer renderInContext:context];
UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

UIPrintInteractionController* pic = [UIPrintInteractionController sharedPrintController];
NSData *imageData = [NSData dataWithData:UIImagePNGRepresentation(img)];
if (pic && [UIPrintInteractionController canPrintData:imageData])
{
    pic.delegate = self;
    UIPrintInfo* printInfo = [UIPrintInfo printInfo];
    printInfo.outputType = UIPrintInfoOutputPhoto;
    printInfo.jobName = @"PrintingImage";
    printInfo.duplex = UIPrintInfoDuplexLongEdge;
    pic.printInfo = printInfo;
    pic.showsPageRange = YES;
    pic.printingItem = imageData;

    void (^completionHandler)(UIPrintInteractionController *, BOOL, NSError *) = ^(UIPrintInteractionController *printController, BOOL completed, NSError *error) {
        if (!completed && error) {
            NSLog(@"FAILED! due to error in domain %@ with error code %u", error.domain, error.code);
        }
    };

    [pic presentAnimated:YES completionHandler:completionHandler];
}
}

any help will be great. Thanks in advance !

Answer 1

On iPad, you should use the popover API provided by the controller. It is mentioned in the documentation.

presentAnimated:completionHandler:

Presents the iPhone printing user interface in a sheet that can be animated to slide up from the bottom of the screen.

presentFromBarButtonItem:animated:completionHandler:

Presents the iPad printing user interface in a popover view that can be animated from a bar-button item.

presentFromRect:inView:animated:completionHandler:

Presents the iPad printing user interface in a popover view that can be animated from any area in a view.

You should use the correct method on the corresponding device type.

if([UIDevice currentDevice].userInterfaceIdiom == UIUserInterfaceIdiomPad) {
    [pic presentFromRect:self.view.frame inView:self.view animated:YES completionHandler:completionHandler];
}
else {
    [pic presentAnimated:YES completionHandler:completionHandler];
}

You should use appropriate parameters for the popover presentation.