如何使用CKNotification？

Question

当cloudkit上的值发生更改时，我希望收到通知

这是我的代码：

let now = Date()
    let timeInterval:TimeInterval = now.timeIntervalSince1970
    let timeStamp = Int(timeInterval)
let publicDB = CKContainer.default().publicCloudDatabase
    let bookID = CKRecord.ID(recordName: "\(timeStamp)")
    let book = CKRecord(recordType: "Book", recordID: bookID)

Answer 1

我通过定期询问解决了这个问题。