如何正确地将图像作为CKAsset发送到CloudKit？

Question

我有一个图像(UIImage,它也是url),我正在尝试将它作为CKAsset发送到CloudKit,但我有这个错误:Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Non-file URL'.这是代码:

override func viewDidLoad() {
        super.viewDidLoad()

        send2Cloud()
    }

func send2Cloud() {
    let newUser = CKRecord(recordType: "User")

    let url = NSURL(string: self.photoURL)

    let asset = CKAsset(fileURL: url!)

    newUser["name"] = self.name
    newUser["photo"] = asset

    let publicData = CKContainer.defaultContainer().publicCloudDatabase

    publicData.saveRecord(newUser, completionHandler: { (record: CKRecord?, error: NSError?) in

        if error == nil {

            dispatch_async(dispatch_get_main_queue(), { () -> Void in
                print("User saved")
            })

        } else {
            print(error?.localizedDescription)
        }
    })
}

我有URL,我可以打印,复制并粘贴到我的导航器,它将显示我的图像!所以,我不知道这里发生了什么......

如果我使用UIImage而不是它的URL会更容易吗？因为,正如我之前所说,我有两个!任何帮助非常感谢!多谢你们!!

Answer 1

根据我的经验,将上传保存UIImage为的唯一方法CKAsset是:

1. 将映像临时保存到磁盘
2. 创建CKAsset
3. 删除临时文件

let data = UIImagePNGRepresentation(myImage); // UIImage -> NSData, see also UIImageJPEGRepresentation
let url = NSURL(fileURLWithPath: NSTemporaryDirectory()).URLByAppendingPathComponent(NSUUID().UUIDString+".dat")
do {
    try data!.writeToURL(url, options: [])
} catch let e as NSError {
    print("Error! \(e)");
    return
}
newUser["photo"] = CKAsset(fileURL: url)

// ...

publicData.saveRecord(newUser, completionHandler: { (record: CKRecord?, error: NSError?) in
    // Delete the temporary file
    do { try NSFileManager.defaultManager().removeItemAtURL(url) }
    catch let e { print("Error deleting temp file: \(e)") }

    // ...
}

我几个月前提交了一份错误报告,要求能够CKAsset从内存中初始化NSData,但尚未完成.