Question

我试图将IN子句与NSPredicate一起使用。我收到以下错误：

***由于未捕获的异常终止应用程序＆＃39; NSInvalidArgumentException＆＃39;，原因：＆＃39; - [NSTaggedPointerString countByEnumeratingWithState：objects：count：]：无法识别的选择器发送到实例0xa000000000000611＆＃39;

以下是代码：

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

您没有展示如何定义recentEmployeeIds，而是假设其类似

let recentEmployeeIds:[Int] = ...

然后你需要正确地初始化NSPredicate。 argumentArray

没有标签

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

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