Question

如何使NSPredicate同时过滤多个对象？以下工作适用于一个对象（在本例中为KDED），但我试图使用swift2同时获得KDED，KDAB和KOMN。

let fetchRequest = NSFetchRequest(entityName: "Airport")
let sortDescriptor = NSSortDescriptor(key: "code", ascending: true)
fetchRequest.sortDescriptors = [sortDescriptor]
let predicate = NSPredicate(format: "code ==%@", "KDED")
    fetchRequest.predicate = predicate

if let managedObjectContext = (UIApplication.sharedApplication().delegate as? AppDelegate)?.managedObjectContext {

    fetchResultController = NSFetchedResultsController(fetchRequest: fetchRequest, managedObjectContext: managedObjectContext, sectionNameKeyPath: nil, cacheName: nil)
    fetchResultController.delegate = self

    do {
        try fetchResultController.performFetch()
        Airports = fetchResultController.fetchedObjects as! [Airport]
    } catch {
       print(error)
    }
}

Answer 1

使用IN运算符：

let predicate = NSPredicate(format: "code IN %@", ["KDED", "KDAB", "KOMN"])

NSPredicate过滤多个字符串

1 个答案: