问在swift中从本地视频创建缩略图

EN

    var err: NSError? = nil
    let asset = AVURLAsset(URL: NSURL(fileURLWithPath: "/that/long/path"), options: nil)
    let imgGenerator = AVAssetImageGenerator(asset: asset)
    let cgImage = imgGenerator.copyCGImageAtTime(CMTimeMake(0, 1), actualTime: nil, error: &err)
    // !! check the error before proceeding
    let uiImage = UIImage(CGImage: cgImage)
    let imageView = UIImageView(image: uiImage)
    // lay out this image view, or if it already exists, set its image property to uiImage

import UIKit
import AVFoundation

do {
    let asset = AVURLAsset(URL: NSURL(fileURLWithPath: "/that/long/path"), options: nil)
    let imgGenerator = AVAssetImageGenerator(asset: asset)
    imgGenerator.appliesPreferredTrackTransform = true
    let cgImage = try imgGenerator.copyCGImageAtTime(CMTimeMake(0, 1), actualTime: nil)
    let uiImage = UIImage(CGImage: cgImage)
    let imageView = UIImageView(image: uiImage)
    // lay out this image view, or if it already exists, set its image property to uiImage
} catch let error as NSError {
    print("Error generating thumbnail: \(error)")
}

import AVFoundation

func imagePreview(from moviePath: URL, in seconds: Double) -> UIImage? {
    let timestamp = CMTime(seconds: seconds, preferredTimescale: 60)
    let asset = AVURLAsset(url: moviePath)
    let generator = AVAssetImageGenerator(asset: asset)
    generator.appliesPreferredTrackTransform = true

    guard let imageRef = try? generator.copyCGImage(at: timestamp, actualTime: nil) else {
        return nil
    }
    return UIImage(cgImage: imageRef)
}