使用CloudKit进行NSPredicate不区分大小写的字符串搜索

Question

我试图搜索CloudKit对象的字符串字段。以下代码行成功编译并且运行时没有错误。

NSPredicate(format: "Title BEGINSWITH %@", "Apple") 

然而，当我尝试添加不区分大小写，它的应用程序崩溃。

NSPredicate(format: "Title BEGINSWITH[cdl] %@", "Apple") 

，错误：

*** Terminating app due to uncaught exception 'CKException', reason: 'Invalid predicate: Title BEGINSWITH[cdl] "Apple" (Error Domain=CKErrorDomain Code=12 "Invalid operator in <Title BEGINSWITH[cdl] "Apple">: Unsupported operator: BEGINSWITH" UserInfo=0x7fb69d02e910 {ck_isComparisonError=true, NSLocalizedDescription=Invalid operator in <Title BEGINSWITH[cdl] "Apple">: Unsupported operator: BEGINSWITH, NSUnderlyingError=0x7fb69d02e9e0 "Unsupported operator: BEGINSWITH"})' 

Answer 1

如从上CKQuery的文档： “基于字符串的比较不区分大小写但否则所有的比较必须在指定值的精确匹配。”

https://developer.apple.com/library/ios/documentation/CloudKit/Reference/CKQuery_class/index.html#//apple_ref/occ/cl/CKQuery

所以我觉得BEGINSWITH是你应该需要。你有没有发现这种情况？