Take a snapshot of a PKAddPassesViewController's view - iphone

Question

I'm trying to take a snapshot of the view displayed when the user is prompted to add a pass.
The goal is being able to generate an image from a given pkpass
I was hoping something like this could work:
NSString *filePath = [[NSBundle mainBundle] pathForResource:#"columbus" ofType:#"pkpass"];
PKPass *pass = [[PKPass alloc] initWithData:[NSData dataWithContentsOfFile:filePath] error:nil];
PKAddPassesViewController *pkAddPassesViewController = [[PKAddPassesViewController alloc] initWithPass:pass];
[self presentViewController:pkAddPassesViewController animated:YES completion:^(){
UIImage *image = [pkAddPassesViewController.view captureView];
UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
[self.view addSubview:imageView];
}];
With captureView being:
- (UIImage *)captureView
{
CGRect screenRect = self.bounds;
UIGraphicsBeginImageContext(self.bounds.size);
CGContextRef ctx = UIGraphicsGetCurrentContext();
[[UIColor clearColor] set];
CGContextFillRect(ctx, screenRect);
[self.layer renderInContext:ctx];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
Guess what? I was wrong:
I tried:
Using the completion callback and the animationFinished callback
Setting the hidden property
Using a timer to make sure the pass was visible on screen when the screenshot was taken
Taking a snapshot of the parent view
I ran out of ideas, so any suggestion is appreciated
Thanks in advance
Oh, I've uploaded a minimal project here:
https://github.com/framp/demo-capturing-passbook
EDIT:
I'm able to take a snapshot of other views and I can load other UIImage just fine with the code above.
The UIImage which is returned is a blank image

Answer 1

Try this, this might work for you.
UIGraphicsBeginImageContext(self.view.frame.size);
[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *newImage=UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
NSData *imageData=UIImagePNGRepresentation(reportImage);

Answer 2

The capture image code is good. Try with : [self.view.superview addSubview:imageView]; in the completion block instead of [self.view addSubview:imageView];

Answer 3

You can try this code if that work for you. Give the Coordinates which you want to capture and thats it. It will save your file in image album. It may give a warning but it works.
UIGraphicsBeginImageContext(CGSizeMake(320, 380));
[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageWriteToSavedPhotosAlbum(viewImage, nil, nil, nil);

Answer 4

I think pkAddPassesViewController is not fully loaded when you taken snapshot. So my suggestion is to take screenshot after some delay.
I hope it will work.