在 swift 中使用 PHImageManager（requestAVAssetForVideo）

Question

我正在使用 objective-c 图像选择器图像选择器来选择时间流逝，但我是在 swift 中进行的。我只能访问 objective-c 代码，所以我使用了 objective-c 到 swift 转换器，但出现错误。

func qb_imagePickerController(imagePickerController: QBImagePickerController, didFinishPickingAssets assets: [AnyObject]) {
    for asset in assets as! [PHAsset] {
        PHImageManager.defaultManager().requestAVAssetForVideo(asset, options: nil, resultHandler: {(avAsset: AVAsset, audioMix: AVAudioMix, info: [NSObject : AnyObject]) -> Void in
            var url: NSURL = NSURL(string: "\(asset)")!
            var avAsset: AVURLAsset = AVURLAsset(URL: url, options: nil)
            var playerItem: AVPlayerItem = AVPlayerItem(asset: avAsset)
            var videoPlayer: AVPlayer = AVPlayer(playerItem: playerItem)
            videoPlayer.play()
        })
    }
    self.dismissViewControllerAnimated(true, completion: { _ in })
}

这是我目前的代码。我收到的错误如下。

Cannot convert value of type '(AVAsset, AVAudioMix, [NSObject : AnyObject]) -> Void' to expected argument type '(AVAsset?, AVAudioMix?, [NSObject : AnyObject]?) -> Void'

Answer 1

查看 requestAVAssetForVideo:options:resultHandler: 的文档您的 resultHandler 与所需的签名不匹配。

更改此行：

PHImageManager.defaultManager().requestAVAssetForVideo(asset, options: nil, resultHandler: {(avAsset: AVAsset, audioMix: AVAudioMix, info: [NSObject : AnyObject]) -> Void in

至：

PHImageManager.defaultManager().requestAVAssetForVideo(asset, options: nil, resultHandler: {(avAsset: AVAsset?, audioMix: AVAudioMix?, info: [NSObject : AnyObject]?) -> Void in

注意在预期位置添加 ?。

Answer 2

从 Swift 中的 PHAsset 获取视频 URL 4.2 从 QBImagePickerController 中的 didFinishPickingAssets

let imagePicker = QBImagePickerController()
imagePicker.delegate = self
imagePicker.numberOfColumnsInPortrait = 2
imagePicker.maximumNumberOfSelection = 2
imagePicker.allowsMultipleSelection = true
imagePicker.mediaType = .video

self.present(imagePicker, animated: true, completion: nil)

func qb_imagePickerController(_ imagePickerController: QBImagePickerController!, didFinishPickingAssets assets: [Any]!) {
     for asset in assets
     {
        PHCachingImageManager().requestAVAsset(forVideo: asset as! PHAsset, options: nil, resultHandler: {(asset, audioMix, info) -> Void in
        if asset != nil {
            let avasset = asset as! AVURLAsset
            let urlVideo = avasset.url
            yourarray.add(urlVideo as URL)
        }

       })

    }


   imagePickerController.dismiss(animated: true) {
       //You can access video urls here
       print("Total Videos:\(yourarray.count)")
   }

}

在 swift 中使用 PHImageManager（requestAVAssetForVideo）

Using PHImageManager in swift (requestAVAssetForVideo)

ios

swift

phasset

timelapse

从 Swift 中的 PHAsset 获取视频 URL 4.2 从 QBImagePickerController 中的 didFinishPickingAssets