how to repeat animation forever in Swift (HUGE_VALF)?
Set the repeatCount to Float.infinity. This compiles and works.
In all probability, HUGE_VALF was a legacy value in any case.
Still, it's a bit of a surprise that these numeric constant names are not seen by Swift. I did try importing <stdlib.h> in the bridging header but it didn't help.
But please see now Martin R's answer. Since the time when I posted my answer, Apple has stated their preferred answer explicitly: use .greatestFiniteMagnitude. It is almost the same thing as .infinity but not quite!
The current documentation for the repeatCount property of CAMediaTiming states:
Setting this property to
greatestFiniteMagnitudewill cause the animation to repeat forever.
And that compiles without problems:
let ba = CABasicAnimation()ba.repeatCount = .greatestFiniteMagnitudeThe reason that HUGE_VALF is not imported into Swift is thatit is defined as a "non-trivial" macro in <math.h>:
# define HUGE_VALF __builtin_huge_valf()