Signature is blank image on iOS 16

[Dilshad-Noushad]

No description provided.

[nishanega]

I'm also facing the same issue. When you try signing in iPhone 14Pro running with iOS 16.0 the signature image is being blank.

[Dilshad-Noushad]

@nishanega I fixed the problem by using YPDrawSignatureView.

[wolfej94]

also facing this issue.

[santosaprima]

I tried updating to 3.2.0 from 2.2.0 earlier and facing the same issue. So, I reverted back to 2.2.0 and it works now

[maulikm235]

I found out that, this issue is with XCode not with this POD, I have tried using downloaded XCode Dmg and it works fine, but the XCode which I have downloaded from AppStore have the issue.

So try using the downloaded XCode Dmg file.

https://stackoverflow.com/questions/10335747/how-to-download-xcode-dmg-or-xip-file

[Vanyaslav]

I have analyzed the issue. And it's pointing directly to PencilKit and object PKDrawing that is not able to create an UIImage from Data object.

[pryder-fleetaero]

We encountered the issue as well and as per @Vanyaslav is appears to be caused by:

/**
    The UIImage representation of the signature. Read/write.
    */
    open var signature: UIImage? {
        get {
            canvas.drawing.image(from: bounds, scale: 1.0)
        }

        set {
            guard let data = newValue?.pngData(), let drawing = try? PKDrawing(data: data) else {
                return
            }
            canvas.drawing = drawing
        }
    }

Where I'm pretty sure PKDrawing(data: data) expects data in the format of PKDrawing.dataRepresentation(), not PNG data.

[JiajunDou]

direct way:

private func resetTool() {
	//canvas.tool = PKInkingTool(.pen, color: strokeColor.withAlphaComponent(strokeAlpha), width: maximumStrokeWidth)
	canvas.tool = PKInkingTool(.pen, color: UIColor.orange, width: maximumStrokeWidth)
    }

[bivant]

We encountered the issue as well and as per @Vanyaslav is appears to be caused by:

    open var signature: UIImage? {
...
        set {
            guard let data = newValue?.pngData(), let drawing = try? PKDrawing(data: data) else {
                return
            }
            canvas.drawing = drawing
        }
    }

Where I'm pretty sure PKDrawing(data: data) expects data in the format of PKDrawing.dataRepresentation(), not PNG data.

I think this (signature restore/load from an image) can be resolved by using UIImageView below the signature drawing view and adjusting clear/undo/redo code for this case.
Custom image save/restore logic with storing drawing data in EXIF can be implemented as well, but this seems like too fragile approach.
Using LegacySwiftSignatureView in SwiftSignatureView.instance is much faster workaround, though.