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我正在对createdAt系统字段进行排序，如下所示：

query.sortDescriptors = [NSSortDescriptor(key: "createdAt", ascending: false)]

并得到以下错误：

CKError 0x1c4447fb0：“无效参数”（12/2018）；服务器消息 = "未知字段'createdAt'"; uuid = 9C450848-2449-4892-93BC-C46363203042；容器 ID = "...

我能够查询和排序我以这种方式创建的字段。系统领域有什么不同吗？该字段的索引是可排序和可查询的。

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1 回答 1

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改为使用creationDate钥匙。CK 仪表板中的元键与用于查询的元键略有不同。以下是元键列表：

recordID: CKRecordID
The unique ID of the record.

recordType: String
The app-defined string that identifies the type of the record.

creationDate: Date?
The time when the record was first saved to the server.

creatorUserRecordID: CKRecordID?
The ID of the user who created the record.

modificationDate: Date?
The time when the record was last saved to the server.

lastModifiedUserRecordID: CKRecordID?
The ID of the user who last modified the record.

recordChangeTag: String?
A string containing the server change token for the record.
于 2018-04-22T10:56:00.567 回答