ios - 如何使用 Swift 将音频文件保存到 iCloud？

Question

我使用 Swift 3 和 Xcode 8.3.3 创建了一个应用程序，用于录制音频文件并将它们保存到应用程序的文档目录中。我现在想将这些文件保存到 iCloud 以备份它们。我已经能够使用以下代码将简单的记录保存到 iCloud:

let database = CKContainer.default().publicCloudDatabase

func saveToCloud(myContent: String){
    let myRecord = CKRecord(recordType: "AudioRecording")
    myRecord.setValue(myContent, forKey: "content")
    database.save(myRecord) { (record, error) in
        print(error ??  "No error")
        guard record != nil else {return}
        print("Saved record to iCloud")
    }
}

看来我只需要添加一行代码，看起来像这样:

newNote.setValue(audioObject, forKey: "Audio")

但我不确定我需要为 audioObject 传递什么对象，以及 iCloud 是否能够处理该对象。有什么建议吗？

Answer 1

使用 iOS 10.x Swift 3.0

您可以将 audioObject 保存为数据 block ；或者在 iCloud 中， Assets 。这是保存图像的一些基本代码，但原理相同，只是一个数据 block 。

这里的代码比您真正需要的要多得多，但我将其保留在上下文中。

func files_saveImage(imageUUID2Save: String) {
    var localChanges:[CKRecord] = []
    let image2updated = sharedDataAccess.image2Cloud[imageUUID2Save]

    let newRecordID = CKRecordID(recordName: imageUUID2Save)
    let newRecord = CKRecord(recordType: "Image", recordID: newRecordID)

    let theLinkID = CKReference(recordID: sharedDataAccess.iCloudID, action: .deleteSelf)
    let thePath = sharedDataAccess.fnGet(index2seek: sharedDataAccess.currentSN)
    newRecord["theLink"] = theLinkID
    newRecord["theImageNo"] = image2updated?.imageI as CKRecordValue?
    newRecord["theImagePath"] = sharedDataAccess.fnGet(index2seek: image2updated?.imageS as! Int) as CKRecordValue?
    newRecord["theUUID"] = imageUUID2Save as CKRecordValue?

    let theURL = NSURL(fileURLWithPath: NSTemporaryDirectory()).appendingPathComponent(NSUUID().uuidString+".dat")
    do {
        try image2updated?.imageD.write(to: theURL!)
    } catch let e as NSError {
        print("Error! \(e)");
        return
    }

    newRecord["theImageBlob"] = CKAsset(fileURL:  URL(string: (theURL?.absoluteString)!)!)

    localChanges.append(newRecord)
    let records2Erase:[CKRecordID] = []

    let saveRecordsOperation = CKModifyRecordsOperation(recordsToSave: localChanges, recordIDsToDelete: records2Erase)
    saveRecordsOperation.savePolicy = .changedKeys
    saveRecordsOperation.perRecordCompletionBlock =  { record, error in
    if error != nil {
        print(error!.localizedDescription)
    }
    // deal with conflicts
    // set completionHandler of wrapper operation if it's the case
    }
    saveRecordsOperation.modifyRecordsCompletionBlock = { savedRecords, deletedRecordIDs, error in
        self.theApp.isNetworkActivityIndicatorVisible = false
        if error != nil {
            print(error!.localizedDescription, error!)
        } else {
            print("ok")
        }
    }

    saveRecordsOperation.qualityOfService = .background
    privateDB.add(saveRecordsOperation)
    theApp.isNetworkActivityIndicatorVisible = true
}

当你想反过来时，你可以使用像这样的代码从 iCloud 解码你的 blob。

 let imageAsset = record["theImageBlob"] as? CKAsset
                if let _ = imageAsset {
                    if let data = NSData(contentsOf: (imageAsset?.fileURL)!) {
                        imageObject = data
                    }
                }

显然这个例子再次处理图像数据，但你我都知道它的所有数据 :) 不管它是什么颜色。

这里唯一需要注意的是速度，我很确定 Assets 与您的普通 iCloud 对象保存在不同的林中，访问它们可能会稍微慢一些。