Question

这是我访问视频的方式：

func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [NSObject : AnyObject]) {

    if let videoURL = info[UIImagePickerControllerMediaURL] as? NSURL {
        let video = NSData(contentsOfURL: videoURL)
    }
}

video我希望在我的控制器中显示用户（我不是指UIDocumentInteractionController预览此内容）。我需要该视频的缩略图，然后将其分配给UIImageView。有可能吗？

Answer 1

最简单的答案：

import AVFoundation

private func thumbnailForVideoAtURL(url: NSURL) -> UIImage? {

    let asset = AVAsset(URL: url)
    let assetImageGenerator = AVAssetImageGenerator(asset: asset)

    var time = asset.duration
    time.value = min(time.value, 2)

    do {
        let imageRef = try assetImageGenerator.copyCGImageAtTime(time, actualTime: nil)
        return UIImage(CGImage: imageRef)
    } catch {
        print("error")
        return nil
    }
}

Answer 2

此处的SWIFT 3.0使用扩展程序

import ConfigParser
import os 


class Configuration(ConfigParser.ConfigParser):
    def __init__(self, config_file):
        ConfigParser.ConfigParser.__init__(self) 
        self.read(config_file)

    def saveSettings(self):
        if not self.has_section('Section A'):
            self.add_section('Section A')
        self.set('Section A', 'Option 1', 'Value 1')

config_file = os.path.join(os.path.expanduser('~'),'config.ini' )
conf = Configuration(config_file)
conf.saveSettings()

然后，您可以随时随地访问 AVAsset / URL ：

import Foundation
import UIKit
import MediaPlayer

import SystemConfiguration

extension AVAsset{
    var videoThumbnail:UIImage?{

        let assetImageGenerator = AVAssetImageGenerator(asset: self)
        assetImageGenerator.appliesPreferredTrackTransform = true

        var time = self.duration
        time.value = min(time.value, 2)

        do {
            let imageRef = try assetImageGenerator.copyCGImage(at: time, actualTime: nil)
            let thumbNail = UIImage.init(cgImage: imageRef)


            print("Video Thumbnail genertated successfuly".DubugSuccess())

            return thumbNail

        } catch {

            print("error getting thumbnail video".DubugError(),error.localizedDescription)
            return nil


        }

    }
}

Answer 3

您可以使用此方法生成缩略图：

import AVFoundation

func generateThumnail(url : NSURL) -> UIImage?{
    let asset: AVAsset = AVAsset(URL: url)
    let assetImgGenerate : AVAssetImageGenerator = AVAssetImageGenerator(asset: asset)
    assetImgGenerate.appliesPreferredTrackTransform = true
    let time        : CMTime = CMTimeMake(1, 30)
    let img         : CGImageRef
    do {
        try img = assetImgGenerate.copyCGImageAtTime(time, actualTime: nil)
        let frameImg: UIImage = UIImage(CGImage: img)
        return frameImg
    } catch {

    }
    return nil
}

Answer 4

回答AiOsN以及如何修复图像旋转的方法。您只需要更改以下代码行：

return UIImage(CGImage: imageRef)

到这一个：

return UIImage(CGImage: imageRef scale: 1.0 , orientation: UIImageOrientation.Right)

，图像将显示正确的旋转。

如何从Swift中的UIPickerViewController中获取视频的缩略图？

4 个答案: