ios - 如何对 Cloudkit 记录执行文本搜索？

Question

我的 Cloudkit 记录中有一个类型为“text”的“Keywords”字段

我可以使用这个模式来获取所有记录的关键字字段

let predicate = NSPredicate(value: true)
let query = CKQuery(recordType: "Library", predicate: predicate)
var operation = CKQueryOperation(query: query)  
operation.desiredKeys = ["KeyWords"]
operation.recordFetchedBlock = { [weak self] (record:CKRecord!) in
  ...
}
operation.queryCompletionBlock = { [weak self] (cursor:CKQueryCursor!, error:NSError!) in
  ...
}
self.publicDatabase!.addOperation(operation)

我想将返回的记录限制为 KeyWords 字段与搜索字符串匹配的记录，我认为这意味着提供合适的谓词。

documentation表示 CONTAINS 仅适用于列表，除非您使用搜索所有文本字段的 self 关键字

但是，将谓词声明替换为:

let predicate = NSPredicate(format: "SELF CONTAINS[c] %@", searchString)

结果

*** Terminating app due to uncaught exception 'CKException', reason: 'Predicate comparison options are not supported for expression: SELF CONTAINS[c]

并使用

let predicate = NSPredicate(format: "SELF CONTAINS %@", searchString)

结果

*** Terminating app due to uncaught exception 'CKException', reason: 'Unexpected expression: SELF CONTAINS

我确信这很简单，但文档还不完整

Answer 1

您可以使用此谓词进行标记搜索:

NSPredicate(format: "allTokens TOKENMATCHES[cdl] %@", tokens)

更新:此功能似乎已更改。您现在可以使用:

NSPredicate(format: @"self contains %@", tokens)

或者这个:

NSPredicate(format: @"self contains 'bob' AND self contains ‘smith’”)

有关更多信息，请参阅:https://developer.apple.com/documentation/cloudkit/ckquery