CloudKit 通知的动态 alertBody

Question

我正在尝试使用 CloudKit 向订阅了发布剧集的频道的用户发送推送通知。我可以创建CKRecord，订阅用户，并在新剧集发布时收到通知，尽管我希望我的alertBody 成为新发布的剧集的标题。

现在推送通知显示用于保存订阅的原始CKRecord 的alertBody。

我读过有人解释如何使用 Localization.Strings 文件，但不知道这对我有什么帮助。 CloudKit 甚至可以做到这一点吗？

static func registerSubscriptionWith(ID: String) {
    let predicate = NSPredicate(format: "channelID == %@", ID)
    let subscription = CKQuerySubscription(recordType: "Episode", predicate: predicate, options: .firesOnRecordCreation)
    
    let myContainer = CKContainer.default()
    let publicDatabase = myContainer.publicCloudDatabase
    
    let recordID = CKRecord.ID(recordName: ID)
    publicDatabase.fetch(withRecordID: recordID) { (record, error) in
        if let error = error {
            print("Error: \(error.localizedDescription)")
        } else {
            if record != nil {
                let notification = CKSubscription.NotificationInfo()
                notification.title = record!["channelName"]
                notification.alertBody = record!["caption"]
                notification.soundName = "default"
                
                subscription.notificationInfo = notification
                
                publicDatabase.save(subscription) { result, error in
                    if error != nil {
                        print(error!.localizedDescription)
                    } else {
                        print("Success subscribing user to episode notifications")
                    }
                }
                
            }
        }
    }
}

Answer 1

是的，这绝对是可能的。

== 第 1 步 ==

在 Xcode 项目的 /Resources 文件夹中创建一个 Localizable.strings 文件并将其放入其中：

"%1$@" = "%1$@";

== 第 2 步 ==

向CKSubscriptions.NotificationInfo() 添加更多详细信息，如下所示：

let info = CKSubscription.NotificationInfo()
  
//Notification Title
info.titleLocalizationKey = "%1$@"
info.titleLocalizationArgs = ["title"] //Matches a CKRecord field on your Episode recordType

//Notification Subtitle (Optional)
info.subtitleLocalizationKey = "%1$@"
info.subtitleLocalizationArgs = ["subtitle"] //Matches a CKRecord field

//Notification Body/Message
info.alertLocalizationKey = "%1$@"
info.alertLocalizationArgs = ["details"] //Matches a CKRecord field

//One key for each of the above to fetch
info.desiredKeys = ["title", "subtitle", "details"]

//Always set this to true
info.shouldSendContentAvailable = true

//More Notification Options
info.shouldBadge = false
info.soundName = "Notification.wav"

subscription.notificationInfo = info

如果您的Episode 记录类型没有title、subtitle 和details，您可能需要在其上添加额外的字段来显示您希望在通知中显示的确切文本。

Answer 2

实现此目的的一种方法是订阅 Episode 上的记录更改，例如为频道 ID 创建新剧集时

let subscription = CKQuerySubscription(
     recordType: "Episode",
     predicate: NSPredicate(format: "channelID == %@", ID),
     subscriptionID: CKQuerySubscription.ID("episode_subscription"),
     options: [
        CKQuerySubscription.Options.firesOnRecordCreation,
     ]
 )

将订阅保存到数据库

let info = CKSubscription.NotificationInfo()
info.shouldSendContentAvailable = true
subscription.notificationInfo = info
        
let operation = CKModifySubscriptionsOperation(
   subscriptionsToSave: [subscription],
   subscriptionIDsToDelete: nil
)

最后一步是在AppDelegate 中处理didReceiveRemoteNotification 中的通知

if let dict = userInfo as? [String: NSObject] {
   if let notification = CKNotification(fromRemoteNotificationDictionary: dict) {
     if let queryNotification = notification as? CKQueryNotification { 
       //Fetch record with id
       let operation = CKFetchRecordsOperation(recordIDs:[queryNotification.recordID])
       ...
       //Show notification when fetch is completed.
     }
  }     
}