Better workaround

[frankschlegel]

Hey,

Thank you so much for sharing this demo!

I was playing a lot with this and found that there is an easier way to enable EDR on the MTKView:
The wantsExtendedDynamicRangeContent property is actually there on iOS as well, just not public. So you can just use KVO to enable EDR rendering:

[self.layer setValue:[NSNumber numberWithBool:YES] forKey:@"wantsExtendedDynamicRangeContent"];

No need to add a hidden AVPlayerLayer anymore. 🙂

Similarly, you can also query the EDR properties of the screen:

[[UIScreen mainScreen] valueForKey:@"extendedDynamicRangeCurrentHeadroom"];
[[UIScreen mainScreen] valueForKey:@"extendedDynamicRangePotentialHeadroom"];
[[UIScreen mainScreen] valueForKey:@"extendedDynamicRangeReferenceHeadroom"];

I hope that helps. Thanks again!