快速将 CloudKit 的结果附加到数组中

如何解决快速将 CloudKit 的结果附加到数组中

我将联系人变量声明为空字符串数组

  var contact = [String] ()

然后我查询了 CloudKit 的结果，当我访问控制器一次时，var contact 成功添加了一个数组

let predicate = NSPredicate(value: true)
    let query = CKQuery(recordType: "Note",predicate: predicate)
    database.perform(query,inZoneWith: nil) { (record,error) in
        for record: CKRecord in record! {
            let name = record.value(forKeyPath: "content") as! String
            print ("There is a note \"\(name)\"")
            self.contact.append(name)
            }
        }
  

   self.contact.append (name)

  print ("There is a note \" \ (name) \ "")

但是当第二次访问时，var 联系人又变空了

  print ("check all array append \ (contact)")

Succes append firstime access the controller

Failed append secondtime access the controller

我在其他函数中使用了变量contact

func sendSOS() {

if canSendText() {

    
   
    //compese message with google link
    let googleLink = "https://www.google.com/maps/place/" + String(myLatitude!) + "+" + String(myLongtitude!)
    let SMStext = "EMERGENCY!!,Tolong Bantu saya di lokasi Latitude: " + String(myLatitude!) + "\n Longtitude: " + String(myLongtitude!) + "  " + googleLink
    let messsageCompose = MFMessageComposeViewController()
    messsageCompose.messageComposeDelegate = self
    messsageCompose.recipients = contact;
    messsageCompose.body = SMStext
    present(messsageCompose,animated: true,completion: nil)

}else{
    // create the alert
    let alert = UIAlertController(title: "No SMS available.",message: "Please find a better location and try again!",preferredStyle: UIAlertController.Style.alert)

    // add an action (button)
    alert.addAction(UIAlertAction(title: "OK",style: UIAlertAction.Style.default,handler: nil))

    // show the alert
    self.present(alert,completion: nil)
    return
}

}

解决方法

很难确定发生了什么，因为您忽略了 contact 数组相对于您的 CKQuery 的初始化方式。

database.perform 行看起来有点可疑。我很确定返回一个 CKRecords 数组，所以你应该有：

database.perform(query,inZoneWith: nil) { records,error in
  //records is an optional array
  if let records = records{
    for record in records{
      //You might have to parse record.values to get its key/value pairs
      let name = record["content"] as? String ?? "No Name"
      print("There is a note: \(name)")
      //:::
      self.contact.append(name)
    }
  }
}

作为旁注，我建议对所有查询 (MessageBox) 使用 CKQueryOperation。这是管理来自 CloudKit 的数据流的一种更简洁的方式。