A SwiftUI View that renders gifs using ImageIO

GifView.swift

import SwiftUI
import ImageIO

struct TestGif {
    static let url: URL = Bundle.main.url(forResource: "your-file-here", withExtension: "gif")!
}

struct GifView: View {
    
    @State private var gif: UIImage
    
    private let gifImageUrl: CFURL
    
    init(gifUrl: URL) {
        gifImageUrl = gifUrl as CFURL
        
        let sourceOptions = [ kCGImageSourceShouldCache: false ] as CFDictionary
        let imageSource = CGImageSourceCreateWithURL(gifImageUrl as CFURL, sourceOptions)!

        let downSampleOptions = [
            kCGImageSourceCreateThumbnailFromImageAlways: true,
            kCGImageSourceShouldCacheImmediately: true,
            kCGImageSourceCreateThumbnailWithTransform: true
        ] as CFDictionary
        
        let scaledImage: CGImage = CGImageSourceCreateThumbnailAtIndex(
            imageSource, 0, downSampleOptions
        )!
        
        gif = UIImage(
            cgImage: scaledImage
        )
    }
    
    var body: some View {
        Image(uiImage: gif)
            .resizable()
            .onAppear(perform: beginAnimation)
    }
        
    
    private func beginAnimation() {
        CGAnimateImageAtURLWithBlock(gifImageUrl, .none) { int, cgImage, bool in
            self.gif = UIImage(cgImage: cgImage)
        }
    }
    
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        GifView(gifUrl: TestGif.url).frame(width: 200, height: 200)
    }
}