Vision-Face-Quality-Live-Photo-Frames.swift

var data : [CustomData] = []
var generator: AVAssetImageGenerator!
var numberOfFrames = 12
    
var frames:[UIImage] = []{
        didSet{
            DispatchQueue.main.async {
                self.setCustomData()
            }
        }
}


func imagesFromVideo(url: URL) {
        let asset = AVURLAsset(url: url)
        
        generator = AVAssetImageGenerator(asset: asset)
        generator.appliesPreferredTrackTransform = true
        generator.apertureMode = .encodedPixels
        let duration:Float64 = CMTimeGetSeconds(asset.duration)
        
        let frameInterval = duration/Double(numberOfFrames)
        
        var nsValues : [NSValue] = []
        
        for index in stride(from: 0, through: duration, by: frameInterval) {
            let cmTime  = CMTime(seconds: Double(index), preferredTimescale: 60)
            let nsValue = NSValue(time: cmTime)
            nsValues.append(nsValue)
        }
        
        self.getFrame(nsValues: nsValues)
}
    
private func getFrame(nsValues:[NSValue]) {
        
        var images : [UIImage] = []
        generator.generateCGImagesAsynchronously(forTimes: nsValues) { (time, cgImage, time2, result, error) in
            if let cgImage = cgImage{
                images.append(UIImage(cgImage: cgImage))
            }
            if images.count == nsValues.count{
                self.frames = images
            }
        }    
}