【Swift】動画からサムネイル画像を切り出してUIImageとして返す

ViewController.swift

func thumnailImageForFileUrl(fileUrl: URL) -> UIImage? {
        let asset = AVAsset(url: fileUrl)

        let imageGenerator = AVAssetImageGenerator(asset: asset)

        do {
            let thumnailCGImage = try imageGenerator.copyCGImage(at: CMTimeMake(value: 1,timescale: 60), actualTime: nil)
            print("サムネイルの切り取り成功！")
            return UIImage(cgImage: thumnailCGImage, scale: 0, orientation: .right)
        }catch let err{
            print("エラー\(err)")
        }
        return nil
    }

AVAsset+.swift

import AVFoundation
import AVKit

extension AVAsset {
    
    func generateThumbnail(completion: @escaping (UIImage?) -> Void) {
        DispatchQueue.global().async {
            let imageGenerator = AVAssetImageGenerator(asset: self)
            let time = CMTime(seconds: 0.0, preferredTimescale: 600)
            let times = [NSValue(time: time)]
            imageGenerator.generateCGImagesAsynchronously(forTimes: times, completionHandler: { _, image, _, _, _ in
                if let image = image {
                    completion(UIImage(cgImage: image, scale: 0, orientation: .right))
                } else {
                    completion(nil)
                }
            })
        }
    }
}

fileUrlに動画のURLを渡すとサムネイルを生成して返してくれます。