signature is blank image on iOS14

[johnqh]

This only happens on iOS14. SwiftSignatureView's signature returns an UIImage, but it is blank.
LegancySwiftSignatureView works, returns the signature image correctly.

[waldo9]

Isn't it a dark mode problem?

[johnqh]

no. It is a problem with PencilKitSignatureView. That does not work on iOS14. In my code, I replaced SwiftSignatureView's with LegacySwiftSignatureView and everything worked.

[waldo9]

For me it works nicely

[waldo9]

Can you share how you get the image from the library? Also please make sure that dark mode is switched off.

[alankarmisra]

@johnqh I've had blank images in the ios14 simualtor but not on the device. Can you confirm you are having this issue while on the device as well? Thanks!

[johnqh]

Yes on device too. I tested on 14.2 and 14.0 when this bug appeared. Definitely not related to dark mode. When I said “blank”, I didn’t mean UI is blank. I meant the UIImage was a blank image. Still an image, but has nothing on it.

[ninjadev106]

I have the same issue on iOS 14.0 & 14.2

[macshodan]

Hi, I had the same problem on iOS 14.4, then I checked the example App provided and it worked.
So I noticed that in the example App the mimimunStroke, maximumStoke and Stroke alpha property were set, while on my project wasn't. I tried to add the same values in the interface builder fields and can successfully get the signature back.
I think it maybe related to the alpha property, probably is 0 by default.

Hope this helps!

[ninjadev106]

It works. Thanks @macshodan

[Dilshad-Noushad]

@johnqh @alankarmisra I am facing the same issue on iOS16 where the signature disappears once I end the drag action. Please shine some information on this.

[nishanega]

@alankarmisra @johnqh @macshodan I'm also facing the same issue. When you try to sign via in iPhone 14Pro running with iOS 16.0 the signature image is being blank.

[wolfej94]

Just to add to this, I'm facing the same issue on iOS 16 and it persists on a real device even after I make sure the properties were set like @macshodan recommended.

[bivant]

That is probably caused by the image assign/restore bug in the signature view.
#62