ios - 通过 CKSubscription 观察 CKRecord 删除不起作用

Question

CKSubscription 文档说:当记录修改导致订阅触发时，服务器会向所有订阅该订阅的设备发送推送通知，但进行原始更改的设备除外 记录。

假设我有两台设备:device 1 和 device 2 从不同的 iCloud 帐户登录。假设两个设备都订阅了某种记录类型的记录删除。

1. 如果 device 1 创建了一条记录，然后 device 1 删除了它，然后 device 2 得到通知 - 这是根据文档，但是..
2. 如果 device 1 创建了一条记录，然后 device 2 删除了它，那么 device 2 会收到通知 - 我不认为这是根据该文档没有任何意义，device 2 删除了它，因此应通知 device 1

---

在设备 1 和设备 2 上设置订阅

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {

    application.registerUserNotificationSettings(UIUserNotificationSettings(forTypes: .Alert, categories: nil))
    application.registerForRemoteNotifications()

    let defaultContainer = CKContainer.defaultContainer()
    let publicDatabase = defaultContainer.publicCloudDatabase

    publicDatabase.fetchAllSubscriptionsWithCompletionHandler({subscriptions, error in

        if error == nil {

            if subscriptions.count == 0 {

                let subscription = CKSubscription(recordType: "OU", predicate: NSPredicate(value: true), options: .FiresOnRecordDeletion)
                subscription.notificationInfo = CKNotificationInfo()
                subscription.notificationInfo.shouldBadge = false
                subscription.notificationInfo.alertBody = "OU removed or upated"
                publicDatabase.saveSubscription(subscription, completionHandler: {subscription, error in
                    if error == nil {
                    } else {
                        println("\(error.localizedDescription)")
                    }
                })
            }

        } else {
            println("\(error.localizedDescription)")
        }
    })


    return true
}

---

在设备 1 上创建记录

@IBAction func addOU(sender: AnyObject) {

    var defaultContainer = CKContainer.defaultContainer()
    var publicDatabase = defaultContainer.publicCloudDatabase

    let r = CKRecord(recordType: "OU", recordID: CKRecordID(recordName: "aaaa"))
    publicDatabase.saveRecord(r, completionHandler: { r2, error in

        if error == nil {
        } else {
            println("\(error.localizedDescription)")
        }
    })
}

---

删除设备 2 上的记录

@IBAction func removeOU(sender: AnyObject) {

    var defaultContainer = CKContainer.defaultContainer()
    var publicDatabase = defaultContainer.publicCloudDatabase

    publicDatabase.deleteRecordWithID(CKRecordID(recordName: "aaaa"), completionHandler: {recordID, error in

        if error == nil {

        } else {
            println("\(error.localizedDescription)")
        }
    })
}

Answer 1

我仍然认为 CKSubscription 的工作原理毫无意义，但作为临时修复，我建议先更改 CKRecord 的 lastModifiedUserRecordID给想要删除记录的用户，然后才删除记录。

要更改 lastModifiedUserRecordID，您必须获取它并且不做任何操作将其保存回来，然后可以删除:

@IBAction func removeOU(sender: AnyObject) {

    var defaultContainer = CKContainer.defaultContainer()
    var publicDatabase = defaultContainer.publicCloudDatabase

    publicDatabase.fetchRecordWithID(CKRecordID(recordName: "aaaa"), completionHandler: {record, error in

        if error == nil {

            publicDatabase.saveRecord(record, completionHandler: {record2, error in

                if error == nil {

                    publicDatabase.deleteRecordWithID(CKRecordID(recordName: "aaaa"), completionHandler: {recordID, error in

                        if error == nil {

                        } else {
                            println("\(error.localizedDescription)")
                        }
                    })
                } else {
                    println("\(error.localizedDescription)")
                }
            })

        } else {
            println("\(error.localizedDescription)")
        }
    })
}