Volodymyr B.

`[(UIView*)[_navigationController.toolbar.subviews objectAtIndex:0] setAlpha:0.75f]; // URGH - I know!` crash on

Does QuickLook has any API which notifies when it closed? Hm, check this one, it's has topic about thread safety. https://developer.apple.com/library/content/documentation/UserExperience/Conceptual/Quicklook_Programming_Guide/Articles/QLImplementationOverview.html#//apple_ref/doc/uid/TP40005020-CH6-SW5

Sorry, just now seeing it. You are right! I will fix it later.

still not fixed :)

Suggestion update to r21e LTS, but not to 22.

This script generates correct `pnglibconf.h` and also builds framework for iOS. Can be modified to create fat static lib. https://gist.github.com/sakrist/4c1126e60fa51323947f

`#define PNG_ARM_NEON_API_SUPPORTED` will be uncommented with ./configuration

I can help with android bit or my sample can give you good start https://github.com/sakrist/Swift_OpenGL_Example