IOS：没有互联网连接时没有调用fetchRecordZoneChangesCompletionBlock

Question

我在我的应用中使用CloudKit。要从iCloud检索所有更改，我使用操作CKFetchRecordZoneChangesOperation。当我没有活动的互联网连接时添加此操作时，永远不会调用fetchRecordZoneChangesCompletionBlock。

我确实希望调用此完成块时出现错误CKError.networkUnavailable。

我正在使用swift 3。

我可能误解了一些事情。有人可以解释我错过的东西吗？

Answer 1

CKOperation Documentation

  

CKOperation对象的默认服务质量等级为   NSQualityOfServiceUtility。此操作   级别被认为是自由裁量的，由系统安排   根据电池电量和其他因素获得最佳时间。上   iPhone，自由活动在低功耗模式下暂停   启用。

您需要做的是手动将CKFetchRecordZoneChangesOperation的QoS设置为.userInitiated

// userInitiated: Used for performing work that has been explicitly requested by the user,
// and for which results must be immediately presented in order to allow for further user interaction.
// For example, loading an email after a user has selected it in a message list.
//
// set to userInitiated make sure the completion with error will immediately returned if currently no internet connection
zoneOperation.qualityOfService = .userInitiated