如何初始化CKAsset？

Question

我有一个类，它有一个从CloudKit拉取数据的CKAsset (图像文件)。但是，我不知道如何初始化CKAsset。我没有初始化时的数据。这个类也有字符串，但我可以使用"“来初始化它们。可以使用什么来初始化CKAsset？

这是我的班级。

class Locations: NSObject, MKAnnotation {
var title: String?
var subtitle: String?
var coordinate: CLLocationCoordinate2D
var story: String?
var image: CKAsset

override init()
{
    self.title = "Test Title"
    self.subtitle = "Test Subtitle"
    self.coordinate = CLLocationCoordinate2D.init()
    self.story = ""
    self.image = <- How do I init the CKAsset before I have the data?
}
}

Answer 1

早上好，您将在下面的代码中找到问题的答案:)

函数saveLeCollection(全局:NSURL){

    let container = CKContainer(identifier: "iCloud.com")
    let publicDB = container.publicCloudDatabase

    let singleLink2LinkthemALL = CKRecordID(recordName: uniqReference)
    let newRecord = CKRecord(recordType: "Collection", recordID: singleLink2LinkthemALL)
    let whistleAsset = CKAsset(fileURL: theAssetURL)
    newRecord["theAsset"] = whistleAsset


    var localChanges:[CKRecord] = []
    localChanges.append(newRecord)

    let saveRecordsOperation = CKModifyRecordsOperation(recordsToSave: localChanges, recordIDsToDelete: nil)
    saveRecordsOperation.savePolicy = .ChangedKeys
    saveRecordsOperation.perRecordCompletionBlock =  { record, error in
        if error != nil {
            self.showAlert(message: error!.localizedDescription)
            print(error!.localizedDescription)
        }
        // deal with conflicts
        // set completionHandler of wrapper operation if it's the case
    }
    saveRecordsOperation.modifyRecordsCompletionBlock = { savedRecords, deletedRecordIDs, error in
        if error != nil {
            self.showAlert(message: error!.localizedDescription)
            print(error!.localizedDescription)
        } else {
            // deal with conflictsay
            // set completionHandler of wrapper operation if it's the case

        }
    }

    publicDB.addOperation(saveRecordsOperation)


}

Answer 2

首先，我要说的是，像你这样在init()中设置属性对于CKAsset是行不通的，因为在你调用并将记录传递给你的类之前，你不会知道CK将保存CKAsset文件的fileURL或名称。然而，我构建了这个框架，你永远不需要在类中有一个CKAsset。它可以处理所有的事情。从下载到缓存，您所需要的就是资产的recordID和属性密钥。您可以直接在imageview上使用这些方法。希望这能有所帮助。https://github.com/agibson73/AGCKImage