ios - 正确初始化PHAssetCollection

我对于如何正确初始化相机应用程序中的PHAssetCollection以便将视频保存到相册感到有些困惑。我不会尝试对相册中的任何视频或图片做任何事情，我只是想通过我围绕AVFoundation开发的相机应用程序将捕获的视频保存到相册中。 Apple的文档对此很少，我在这里看到的所有问题都无法完全解决。我是否应该为此任务使用资产收集？还是使用Photos框架有更简单的方法？

这是在视频开始和结束录制时调用的委托函数

        println("capture output : finish recording to \(outputFileURL)")

        self.weAreRecording = false
        self.isSessionRunning = false

        println("Getting moments in photo library")

        let results: PHFetchResult = PHAssetCollection.fetchAssetCollectionsWithType(PHAssetCollectionType.Moment, subtype: PHAssetCollectionSubtype.AlbumRegular, options: nil)

        var assetCollection: PHAssetCollection?

//        SHOULD I EVEN BE DOING THIS??? IM NOT TRYING TO DO ANYTHING IN THE PHOTOS ALBUM

//        results.enumerateObjectsUsingBlock { (object, index, stop) -> Void in
//
//            let assetCollection: PHAssetCollection = object as! PHAssetCollection
//
//            momentsCount++
//
//            blah blah blah
//
//        }

        let priority = DISPATCH_QUEUE_PRIORITY_DEFAULT

        dispatch_async(dispatch_get_global_queue(priority, 0), {

            PHPhotoLibrary.sharedPhotoLibrary().performChanges({

                let request = PHAssetChangeRequest.creationRequestForAssetFromVideoAtFileURL(outputFileURL)

                let assetPlaceholder = request.placeholderForCreatedAsset

                // The problem is here, since I am not entirely sure how to go about initializing
                // The assetCollection correctly
                let albumChangeRequest = PHAssetCollectionChangeRequest(forAssetCollection: assetCollection, assets: results)

                albumChangeRequest.addAssets([assetPlaceholder])

                }, completionHandler: {(success, error) in

                    if success {

                         NSLog("Adding video to Library -> %@", (success ? "Sucess" : "Error!"))
                    }
                    else {

                        println("There was an error saving the video")
                    }
            })

        })
    }

    func captureOutput(captureOutput: AVCaptureFileOutput!, didStartRecordingToOutputFileAtURL fileURL: NSURL!, fromConnections connections: [AnyObject]!) {

        println("capture output: started recording to \(fileURL)")

        self.isSessionRunning = true
        self.weAreRecording = true
    }

最佳答案

我认为您谈论的PHAssetCollection都是红色鲱鱼。由于您只想将视频保存到相机胶卷中，因此请调用UISaveVideoAtPathToSavedPhotosAlbum。

如果由于某种原因您不愿意这样做，则可以直接将其保存到照片库中，大致像这样(直接键入，未经测试，可能需要一些修改):

PHPhotoLibrary.sharedPhotoLibrary().performChanges({
    PHAssetChangeRequest.creationRequestForAssetFromVideoAtFileURL(f)
    }, completionHandler: {
        (ok:Bool, err:NSError!) in
        // whatever
})

关于ios - 正确初始化PHAssetCollection，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/30356380/