swift3 用Alamofire下载视频、断点续传

swift3 用Alamofire下载视频、断点续传

本文就是使用alamofire下载视频，把视频存到沙盒目录Documents下面

xib上布局两个按钮：一个下载；一个暂停按钮；一个进度条；在视频下载完成后使用AVPlayController播放本地视频：

import UIKit
import Alamofire
import AVKit
import AVFoundation

class DownloadViewController: UIViewController {

    @IBOutlet weak var progress: UIProgressView!

    var videoUrl:String = "http://112.65.235.161/vlive.qqvideo.tc.qq.com/s00223no2is.p201.1.mp4?sdtfrom=v1010&guid=c04547d98851d0968ca0c30bb3fe7c43&vkey=5B46FD2FBB9EED8072F5DB7CAFCD6F10744594516C28415A5BAE9A23A1F0F68576ED30A586465A952ADA5858968CC1B26DAE90D79C3DA65B03C63BB0D37F33DAB5E215D029A51E1582CF198391511564997A3E627E0D128ECFD1D9E93CD5B02676B20B3DA974D09062D84264151DC55E&locid=1d20eacc-9dce-4014-93e4-49e2b1f96266&size=20133046&ocid=1412898732"
    var videoUrl2:String = "http://112.65.235.161/vlive.qqvideo.tc.qq.com/p0022r6bpey.p201.1.mp4?sdtfrom=v1010&guid=c04547d98851d0968ca0c30bb3fe7c43&vkey=6E67D5E280D3660CAD081D0CB6E9D2838273552E67407B6D552EEABBB2F33EBD83D18466960E770E67950A7C48BB0A5E8B5D91BB5F53C575771AC7FCCAF123DF7E0990914B3AFC428FD4A82E4FB857667753EC5C3B259B54B7D675D5C2628C886B0648D1D2D0E9924B864B8056755609&locid=a368a2bc-de9a-466d-a835-15cccd415310&size=20165368&ocid=1362567084"

    var cancelledData:Data? //中止下载时保存已下载部分

    var downloadRequest:DownloadRequest!

    //指定下载路径
    let destination:DownloadRequest.DownloadFileDestination = { _, response in
        let documentURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
        let fileURL = documentURL.appendingPathComponent(response.suggestedFilename!)
        return (fileURL,[.removePreviousFile,.createIntermediateDirectories])
    }

    class func loadClass()->DownloadViewController {
        return DownloadViewController(nibName:"DownloadViewController",bundle:nil)
    }

    override func viewDidLoad() {
        super.viewDidLoad()

    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    func downloadProgress(progress:Progress){
        self.progress.setProgress(Float(progress.fractionCompleted), animated: true)
        print("当前进度:\(progress.fractionCompleted*100)%")
    }

    func downloadResponse(response:DownloadResponse<Data>){
        switch response.result {
        case .success(let _):
            //下载完成
            DispatchQueue.main.async {
                print("路径:\(response.destinationURL?.path)")
                let item = AVPlayerItem(url:URL(fileURLWithPath: (response.destinationURL?.path)!))
                let play = AVPlayer(playerItem:item)
                let playController = AVPlayerViewController()
                playController.player = play
                self.present(playController, animated: true, completion: {

                })
            }
        case .failure(error:):
            self.cancelledData = response.resumeData //意外停止的话把已下载的数据存起来
            break
        }
    }

    @IBAction func beginDownload(_ sender: Any) {
        if let cancelledData = self.cancelledData {
            //续传
            self.downloadRequest = Alamofire.download(resumingWith: cancelledData, to: self.destination)
            self.downloadRequest.downloadProgress(closure: downloadProgress)
            self.downloadRequest.responseData(completionHandler: downloadResponse)
        }else{
            //开始下载
            self.downloadRequest = Alamofire.download(self.videoUrl, to: self.destination)
            self.downloadRequest.downloadProgress(closure: downloadProgress)
            self.downloadRequest.responseData(completionHandler: downloadResponse)
        }

    }

    @IBAction func pauseDownload(_ sender: Any) {
        self.downloadRequest.cancel()
    }
}