Swift 核心数据谓词 IN 子句

Question

我正在尝试将 IN 子句与 NSPredicate 一起使用。我收到以下错误：

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSTaggedPointerString countByEnumeratingWithState:objects:count:]: unrecognized selector sent to instance 0xa000000000000611'

代码如下：

let fetchRequest: NSFetchRequest<Employee> = NSFetchRequest(entityName: "Employee")

fetchRequest.sortDescriptors = [
     NSSortDescriptor.init(key: "lastName", ascending: true)
]

fetchRequest.predicate = NSPredicate(format: "ANY id IN %@", argumentArray: recentEmployeeIds)

fetchedResultsController = NSFetchedResultsController.init(fetchRequest: fetchRequest,
                                                                           managedObjectContext: FLCoreDataController.shared.mainObjectContext,
                                                                           sectionNameKeyPath: nil,
                                                                           cacheName: nil)
fetchedResultsController?.delegate = self

try? fetchedResultsController?.performFetch()

关于问题是什么有什么想法吗？

Answer 1

您没有说明您是如何定义 recentEmployeeIds，但假设它类似于

let recentEmployeeIds:[Int] = ...

然后你需要正确初始化NSPredicate。 argumentArray

没有标签

fetchRequest.predicate = NSPredicate(format: "ANY id IN %@", recentEmployeeIds)

Swift 核心数据谓词 IN 子句

Swift Core Data Predicate IN Clause

core-data

nspredicate

ios

swift