ios – 使用CloudKit进行NSPredicate不区分大小写的字符串搜索

我正在尝试搜索CloudKit对象的String字段.以下行成功编译并运行,没有错误.

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

然而,当我尝试添加不区分大小写的搜索时,应用程序崩溃了.

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

有错误：

*** 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"})'

解决方法

从CKQuery的文档中可以看出：
“基于字符串的比较不区分大小写,但所有比较都必须与指定值完全匹配.”

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

所以我认为BEGINSWITH就是你所需要的.你有没有发现这种情况？