insidegui

let container = CKContainer.default()

insidegui

/// Helper method to retry a CloudKit operation when its error suggests it
///
/// - Parameters:
///   - error: The error returned from a CloudKit operation
///   - block: A block to be executed after a delay if the error is recoverable
/// - Returns: If the error can't be retried, returns the error
func retryCloudKitOperationIfPossible(with error: Error?, block: @escaping () -> ()) -> Error? {
    guard let effectiveError = error as? CKError else {
        // not a CloudKit error or no error present, just return the original error
        return error

insidegui

container.publicCloudDatabase.save(subscription) { [weak self] savedSubscription, error in
    guard let savedSubscription = savedSubscription, error == nil else {
        // awesome error handling
        return
    }
	
    // subscription saved successfully
    // (probably want to save the subscriptionID in user defaults or something)
}

insidegui

let info = CKNotificationInfo()
info.alertLocalizationKey = "movie_registered_alert"
info.alertLocalizationArgs = ["title"]
info.soundName = "default"
info.desiredKeys = ["title"]
subscription.notificationInfo = info

insidegui

let subscription = CKQuerySubscription(recordType: "Movie",
                                        predicate: NSPredicate(value: true),
                                          options: [.firesOnRecordCreation])

insidegui

UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .sound]) { authorized, error in
    guard error == nil, authorized else { 
        // not authorized...
        return
    }
	
    // subscription can be created now \o/
}

UIApplication.shared.registerForRemoteNotifications()

insidegui

NSPredicate(format: "distanceToLocation:fromLocation:(location, %@) < %f", currentLocation, radius)

insidegui

CKContainer.default().publicCloudDatabase.add(operation)

insidegui

let predicate = NSPredicate(format: "self contains %@", title)
let query = CKQuery(recordType: "Movie", predicate: predicate)

insidegui

let movieRecords: [CKRecord] = []

operation.recordFetchedBlock = { record in
    // record é um registro do tipo Movie que foi obtido na operação
    movieRecords.append(record)
}

operation.queryCompletionBlock = { cursor, error in
    // movieRecords agora contém todos os registros que foram obtidos nesta operação
    print(movieRecords)