Not able to draw shadows using UIGraphicsImageRenderer

I am trying convert an UIView into an UIImage using UIGraphicsImageRenderer. I have applied shadows on my UIView but shadows gets removed in output image.
Here's my code:

let view = UIView(frame: .init(origin: .zero, size: compressedImage.size))
view.backgroundColor = .lightGray
view.layer.shadowColor = UIColor.black.cgColor
view.layer.shadowRadius = 5
view.layer.shadowOpacity = 0.5
view.layer.shadowOffset = .init(width: 2, height: 2)

let renderer = UIGraphicsImageRenderer(size: view.bounds.size)
let rendereredImage = renderer.image { ctx in
     view.drawHierarchy(in: view.bounds, afterScreenUpdates: true)
}

if you assign this rendereredImage to an UIImageView you can see that there are no shadows.
can you tell me what's happening ?

When you add a shadow, the bounds of the view do not change. The shadow appears outside of the bounds of the view. If the size of the image is view.bounds, then the shadow will be cut off.

A simple way to fix this is to put the view inside a slightly larger superview:

let view = UIView(frame: .init(origin: .init(x: 2, y: 2), size: compressedImage.size))
view.backgroundColor = .lightGray
view.layer.shadowColor = UIColor.black.cgColor
view.layer.shadowRadius = 5
view.layer.shadowOpacity = 0.5
view.layer.shadowOffset = .init(width: 2, height: 2)

let superView = UIView(frame: .init(
    x: 0, y: 0, 
    width: compressedImage.size.width + 5, 
    height: compressedImage.size.height + 5
))
superview.backgroundColor = .clear
superView.addSubview(view)

let renderer = UIGraphicsImageRenderer(size: superView.bounds.size)
let rendereredImage = renderer.image { ctx in
    superView.drawHierarchy(in: superView.bounds, afterScreenUpdates: true)
}

Alternatively, consider using view.layer.render(in:).

let renderer = UIGraphicsImageRenderer(size: view.bounds.insetBy(dx: -5, dy: -5).size)
let rendereredImage = renderer.image { ctx in
    view.layer.render(in: ctx.cgContext)
}

If you're not able to draw shadows using UIGraphicsImageRenderer, it's possible that you're not setting the appropriate shadow properties or that your drawing code is not correctly configuring the renderer to draw shadows.

Here are some things to check:

1. Make sure you're setting the shadow properties correctly. The key shadow properties are shadowOffset, shadowOpacity, shadowRadius, and shadowColor. You should set these properties on the CGContext before drawing your content. For example:

context.setShadow(offset: CGSize(width: 2, height: 2), blur: 4, color: UIColor.gray.cgColor)

2. Check that you're drawing the shadowed content in the correct order. The shadow should be drawn first, before any other content that it should cast a shadow on. The content that casts the shadow should be drawn on top of the shadow. For example:

let renderer = UIGraphicsImageRenderer(size: CGSize(width: 100, height: 100))
let image = renderer.image { context in
    // Draw the shadow first
    context.setShadow(offset: CGSize(width: 2, height: 2), blur: 4, color: UIColor.gray.cgColor)
    context.fill(CGRect(x: 10, y: 10, width: 80, height: 80))

    // Draw the content that casts the shadow on top of the shadow
    context.setFillColor(UIColor.red.cgColor)
    context.fill(CGRect(x: 20, y: 20, width: 60, height: 60))
}

3. Make sure you're using a context that supports shadows. The UIGraphicsImageRenderer uses a context that supports shadows by default, but other context types may not support shadows. If you're using a custom context, make sure that it's configured to support shadows. For example:

let context = UIGraphicsGetCurrentContext()!
context.setShadow(offset: CGSize(width: 2, height: 2), blur: 4, color: UIColor.gray.cgColor)

These are some common issues that can prevent shadows from being drawn correctly using UIGraphicsImageRenderer. If you're still having trouble, please provide more details about your code and what you're trying to achieve, and I can provide more specific advice.