I was hoping to find a Swift-based solution but there seems to be none. For whatever reason, both the AFathi's GIF generator and my APNG adaptation of it simply doesn't work. I suspect it has something to do with the UTType mess after kUTType was deprecated in iOS 15. I went ahead and adapted the Obj-C solution by Radif Sharafullin at https://github.com/radif/MSSticker-Images. I've included the updated code that has been confirmed to be working with iOS 17.2 below. The code is, as far as I can tell, basically the same as the Swift code, so I'm baffled as to why the Swift version doesn't work. If anyone figures out why, please let us know here! I won't mark this thread as having an answer since my stop-gap solution isn't Swift-based: #import "mcbAnimatedImagePersister.h" #import <ImageIO/ImageIO.h> #import <MobileCoreServices/MobileCoreServices.h> #import <UniformTypeIdentifiers/UniformTypeIdentifiers.h> @implementation mcbAnimatedImagePersister +(instancetype)shared{ static mcbAnimatedImagePersister * instance=nil; static dispatch_once_t onceToken; dispatch_once(&onceToken, ^{ instance=mcbAnimatedImagePersister.new; }); return instance; } -(void)persistAnimatedImageSequenceGIF:(NSArray<UIImage *> *)images frameDelay:(CGFloat)frameDelay numberOfLoops:(NSInteger)numberOfLoops toURL:(NSURL *)toURL{ NSDictionary *fileProperties = @{ (__bridge id)kCGImagePropertyGIFDictionary: @{ (__bridge id) kCGImagePropertyGIFLoopCount: @(numberOfLoops), } }; NSDictionary *frameProperties = @{ (__bridge id)kCGImagePropertyGIFDictionary: @{ (__bridge id)kCGImagePropertyGIFDelayTime: @(frameDelay), } }; CGImageDestinationRef destination = CGImageDestinationCreateWithURL((__bridge CFURLRef)toURL, (__bridge CFStringRef)UTTypeGIF.identifier, images.count, NULL); CGImageDestinationSetProperties(destination, (__bridge CFDictionaryRef)fileProperties); for (UIImage * image in images) { CGImageDestinationAddImage(destination, image.CGImage, (__bridge CFDictionaryRef)frameProperties); } if (!CGImageDestinationFinalize(destination)) { NSLog(@"failed to finalize image destination"); } CFRelease(destination); } -(void)persistAnimatedImageSequenceAPNG:(NSArray<UIImage *> *)images frameDelay:(CGFloat)frameDelay numberOfLoops:(NSInteger)numberOfLoops toURL:(NSURL *)toURL{ NSDictionary *fileProperties = @{ (__bridge id)kCGImagePropertyPNGDictionary: @{ (__bridge id)kCGImagePropertyAPNGLoopCount: @(numberOfLoops), } }; NSDictionary *frameProperties = @{ (__bridge id)kCGImagePropertyPNGDictionary: @{ (__bridge id)kCGImagePropertyAPNGDelayTime: @(frameDelay), } }; CGImageDestinationRef destination = CGImageDestinationCreateWithURL((__bridge CFURLRef)toURL, (__bridge CFStringRef)UTTypePNG.identifier, images.count, NULL); CGImageDestinationSetProperties(destination, (__bridge CFDictionaryRef)fileProperties); for (UIImage * image in images) { CGImageDestinationAddImage(destination, image.CGImage, (__bridge CFDictionaryRef)frameProperties); } if (!CGImageDestinationFinalize(destination)) { NSLog(@"failed to finalize image destination"); } CFRelease(destination); } @end

A partial answer can be found in the following sample code: Implementing Special Rendering Effects with RealityKit Postprocessing This sort of solves my problem, but doesn't change the fact that I'm still depending on SpriteKit to render my 2D content.

The following sample code shows how to implement SpriteKit within RealityKit: Implementing Special Rendering Effects with RealityKit Postprocessing RealityKit will still be running at 60 FPS, but the SpriteKit View's framerate should be adjustable.

Edit: @Eskimo Err come to think about it I should ask for one clarification regarding APs not forwarding STA-to-STA traffic before I burn myself: In your previous response you were ambiguous about the device brand, probably due to all the Peer-to-Peer Wi-Fi specifications out there. My use case is only between Apple products. Period. Does the phenomenon of some APs not forwarding STA-to-STA traffic apply to iPhone Hotspots talking with iPhones or iPads or Macs? E.g. Can an iPhone hosting a Hotspot Connection (being both AP and STA) and the iPhone being hosted (the pure STA) communicate with each other (e.g. cross streaming videos)? I did a double take and came back to ask because this is critical to me.