Swift-使用downloadTaskWithURL下载视频

• Z时代
• 2024-01-10
• 分类：问答

感谢downloadTaskWithURL，我正在下载视频，并使用以下代码将其保存到我的画廊：

    func saveVideoBis(fileStringURL:String){
    print("saveVideoBis");
    let url = NSURL(string: fileStringURL);
    (NSURLSession.sharedSession().downloadTaskWithURL(url!) { (location:NSURL?, r:NSURLResponse?, e:NSError?) -> Void in
        let mgr = NSFileManager.defaultManager()
        let documentsPath = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0];
        print(documentsPath);
        let destination = NSURL(string: NSString(format: "%@/%@", documentsPath, url!.lastPathComponent!) as String);
        print(destination);
        try? mgr.moveItemAtPath(location!.path!, toPath: destination!.path!)
        PHPhotoLibrary.requestAuthorization({ (a:PHAuthorizationStatus) -> Void in
            PHPhotoLibrary.sharedPhotoLibrary().performChanges({
                PHAssetChangeRequest.creationRequestForAssetFromVideoAtFileURL(destination!);
                }) { completed, error in
                    if completed {
                        print(error);
                        print("Video is saved!");
                        self.sendNotification();
                    }
            }
        })
    }).resume()
}

它在我的模拟器上可以正常工作，但是在我的iPad上，即使print("Video is saved!");出现视频也不会保存视频。你知道为什么吗？

我的控制台中也出现了该消息

无法从文件创建数据（空）

回答：

请通过代码检查注释：

import UIKit
import Photos
class ViewController: UIViewController {
    func downloadVideoLinkAndCreateAsset(_ videoLink: String) {
        // use guard to make sure you have a valid url
        guard let videoURL = URL(string: videoLink) else { return }
        guard let documentsDirectoryURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first else { return }
        // check if the file already exist at the destination folder if you don't want to download it twice
        if !FileManager.default.fileExists(atPath: documentsDirectoryURL.appendingPathComponent(videoURL.lastPathComponent).path) {
            // set up your download task
            URLSession.shared.downloadTask(with: videoURL) { (location, response, error) -> Void in
                // use guard to unwrap your optional url
                guard let location = location else { return }
                // create a deatination url with the server response suggested file name
                let destinationURL = documentsDirectoryURL.appendingPathComponent(response?.suggestedFilename ?? videoURL.lastPathComponent)
                do {
                    try FileManager.default.moveItem(at: location, to: destinationURL)
                    PHPhotoLibrary.requestAuthorization({ (authorizationStatus: PHAuthorizationStatus) -> Void in
                        // check if user authorized access photos for your app
                        if authorizationStatus == .authorized {
                            PHPhotoLibrary.shared().performChanges({
                                PHAssetChangeRequest.creationRequestForAssetFromVideo(atFileURL: destinationURL)}) { completed, error in
                                    if completed {
                                        print("Video asset created")
                                    } else {
                                        print(error)
                                    }
                            }
                        }
                    })
                } catch { print(error) }
            }.resume()
        } else {
            print("File already exists at destination url")
        }
    }
    override func viewDidLoad() {
        super.viewDidLoad()
        downloadVideoLinkAndCreateAsset("https://www.yourdomain.com/yourmovie.mp4")
    }
}

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