bitsPerComponent says it's at most 8, but a couple of Stack Overflow questions imply 16 is supported.
Does CGImage support 16 bits per channel?
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You can find the necessary information in “Supported Pixel Formats“ in the “Graphics Contexts“ chapter of “Quartz 2D Programming Guide“ below even it is archived documentation.
https://developer.apple.com/library/archive/documentation/GraphicsImaging/Conceptual/drawingwithquartz2d/dq_context/dq_context.html
The below figure is taken from the above url.
Note that “bpp“ is specified as “bits per pixel“ and “bcp“ is “bits per component“. As given in above table, it seems that only Mac OS (>=10.X versions) supports 16 bcp, not iOS.