NSPredicate 在 swift 4 时崩溃

Question

我从字符串数组中搜索字符串，并且该代码在 swift 3 中正常工作，但是在转换 swift 4 之后，我开始搜索时遇到以下错误。

invalid mode 'kCFRunLoopCommonModes' provided to CFRunLoopRunSpecific - break on _CFRunLoopError_RunCalledWithInvalidMode to debug. This message will only appear once per execution.

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Can't do a substring operation with something that isn't a string (lhs = "A" rhs = N)'

这是我的代码

let predicate = NSPredicate(format: "SELF BEGINSWITH[cd] %@", searchText)
let arrSearchData = NSMutableArray(array: arrHomeTownData.filtered(using: predicate))

Answer 1

终于找到解决办法了，问题出在这一行

let arrSearchData = NSMutableArray(array: arrHomeTownData.filtered(using: predicate))

它变成了字符数组而不是字符串数组，所以我link这样做，问题就解决了

let arrSearchData : [String] = NSMutableArray(array: arrHomeTownData.filtered(using: predicate))

NSPredicate 在 swift 4 时崩溃

NSPredicate crash in swift 4

nspredicate

ios

swift4