CKAsset未保存到CloudKit中-所有其他字段都已保存

Question

我有一个CloudKit应用程序，它基本上是一个带有一个额外功能的主细节设置。任何详细信息对象都可以标记为ActiveNote。当应用程序在iPad上时，只显示这个ActiveNote（没有用户交互）。该应用程序包括通知和订阅，所有数据都在专用数据库的自定义区域中。该应用程序运行良好，但有一个例外。

只有两种记录类型。所有数据都以cnote类型存储。当一个细节项目被选择显示在iPad上时，我会将该数据上传到一个类型为ActiveNote的记录中。ActiveNote数据仅由iPad用于填充其只读版本的详细信息视图。每当手机用户将记录标记为活动时，iPad就会动态变化。

如能提供任何指导，不胜感激。下面是保存到单个ActiveNote的代码。iOS 11,Xcode 9.3

func queryActiveNote() {

    recordZone = CKRecordZone(zoneName: "CNotes")

    let query = CKQuery(recordType: "ActiveNote", predicate: NSPredicate(format: "TRUEPREDICATE"))
    let sortDescriptor = NSSortDescriptor(key: "noteName", ascending: true)
    query.sortDescriptors = [sortDescriptor]

    privateDatabase.perform(query, inZoneWith: recordZone?.zoneID) { (results, error) in
        if error != nil {
            print("error querying database\(String(describing: error?.localizedDescription))")
        } else {

            guard results?.count > 0 else {return}
            print("results?.count is \(String(describing: results?.count))")

            self.activeNote = results![0]

            self.activeNote!["noteName"] = self.detailItem?["noteName"]

            //save a bunch of other fields too

            let tmpDir = NSTemporaryDirectory()
            let tmpFile = tmpDir.appending("test.png")
            let tmpFileURL = URL(fileURLWithPath: tmpFile)

            //Main queue to avoid runtime warning that image needs to be on main thread
            DispatchQueue.main.async {
                guard let tmpImage = self.imageView.image else {
                    print("guard let tmpImage failed")
                    return
                }

                guard let tmpImageData = UIImageJPEGRepresentation(tmpImage, 1.0) else {
                    print("guard let tmpImageData failed")
                    return
                }

                do {
                    try tmpImageData.write(to: tmpFileURL, options: .atomic)
                    print("the write of chosenImageData succeeded")
                } catch {
                    print("error writing chosenImageData to a file")
                }//do catch

                let asset : CKAsset = CKAsset(fileURL: tmpFileURL)
                self.activeNote!["noteImageData"] = asset

            }//main

            self.privateDatabase.save(self.activeNote!, completionHandler: { (record, error) in
                if error != nil {
                    print("privateDatabase error saving activeNote: \(String(describing: error?.localizedDescription))")
                } else {
                    print("modified activeNote record saved successfully")

                    DispatchQueue.main.async {
                        let ac = UIAlertController(title: nil , message: "Record was successfully saved as Active", preferredStyle: .alert)
                        let okAction = UIAlertAction(title: "Ok", style: .default, handler: nil)
                        ac.addAction(okAction)
                        self.present(ac, animated: true, completion: nil)
                    }//main

                }//if error else
            })//save block

        }//if error else
    }//perform query block

}//queryActiveNote

Answer 1

用户3069232的答案应该得到赞扬。上面的代码确实在图像文件保存完成之前将记录保存到CloudKit。我在do catch块中移动了CloudKit save块，这个过程成功了。因为我保证所有记录中都有一个图像（有一个默认值），所以以成功保存图像为条件进行CloudKit保存是可以的。