问在AppDelegate中运行CKQuery -等待完成

EN

func getPeople() {
    let query = CKQuery(recordType: "Person", predicate: Predicate(format: "TRUEPREDICATE", argumentArray: nil))
    CKContainer.default().privateCloudDatabase.perform(query, inZoneWith: nil) { (records, error) in
        if error == nil {
            names.removeAll()
            messages.removeAll()
            pictures.removeAll()
            recordIds.removeAll()

            for record in records! {

                names.append(record.object(forKey: "name") as! String)
                messages.append(record.object(forKey: "message") as! String)
                pictures.append(UIImage(data: record.object(forKey: "picture") as! NSData as Data)!)
                recordIds.append(record.recordID)

            }

            print("done")

        } else {

            print(error)
            print(error?.code)

        }

    }

}

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
    performSelector(onMainThread: #selector(getPeople), with: nil, waitUntilDone: true)

    return true
}