Invalid context about uiimage-pdf

[mindbrix]

Hi @stickytroll, thanks for the report. I suspect the calls to UIGraphicsBeginImageContextWithOptions() and UIGraphicsGetCurrentContext are failing, possibly a bug in UIKit.

I need to switch over to using CGBitmapContextCreate().

[mindbrix]

@stickytroll, have you checked that self.convertButton.frame.size is non-zero?

Hi, yes the frame size is non-zero. The image is being created (and cached) at the correct size of the button's frame.

[mindbrix]

Hi. I've made some changes to the code. Can you see if you still get the error?

The latest code seems to be working fine, without any warnings... What was the issue?

[mindbrix]

My guess is that UIGraphicsBeginImageContextWithOptions() was failing, so I replaced it with the Core Graphics equivalents. I've also added more parameter validation.

Thanks for your help ;-)