快速核心数据谓词IN条款

Question

我正在尝试使用带有NSPredicate的IN子句.我收到以下错误:

***由于未捕获的异常'NSInvalidArgumentException'终止应用程序,原因:' - [NSTaggedPointerString countByEnumeratingWithState:objects:count:]:无法识别的选择器发送到实例0xa000000000000611'

这是代码:

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()

关于问题是什么的任何想法？

Answer 1

你没有展示你如何定义recentEmployeeIds,但假设它是这样的

let recentEmployeeIds:[Int] = ...

那么你需要NSPredicate正确初始化.没有标签argumentArray

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