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let fetchedResultsController: NSFetchedResultsController = ... var error : NSError? fetchedResultsController.performFetch(&error) if let error = error { NSLog("Error: \(error)") } let lists: [List] = fetchedResultsController.fetchedObjects! as [List] NSLog("lists count = \(lists.count)") for list: List in lists { NSLog("List: \(list.description)") }
它的工作方式与预期的一样,我将List对象描述打印到控制台.
我想为我的应用程序编写一些单元测试,所以我创建了扩展XCTESTCase的类.代码编译没有问题,测试运行,但不幸的是我无法在该上下文中获取List对象.
我在控制台中获得的所有内容都是List对象的数量和致命错误:
lists count = 59 Fatal error: NSArray element Failed to match the Swift Array Element type
线路上升:
for list: List in lists {
我很确定我已经正确配置了目标,因为我可以创建List对象并将其插入到托管对象上下文中,而不会出现我的应用程序源代码以及单元测试源代码的问题.我遇到的唯一问题是从测试单元获取.我想知道为什么在模拟器中运行应用程序时提取工作正常,并且在单元测试期间执行时失败.
任何可能出错的想法都将受到赞赏.
更新:
var error: NSError? = nil let urls = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory,inDomains: .UserDomainMask) let applicationDocumentsDirectory = urls[urls.count-1] as NSURL let modelURL = NSBundle.mainBundle().URLForresource("checkLists",withExtension: "momd")! let managedObjectModel = NsmanagedObjectModel(contentsOfURL: modelURL) var coordinator: NSPersistentStoreCoordinator? = NSPersistentStoreCoordinator(managedObjectModel: managedObjectModel) let url = applicationDocumentsDirectory.URLByAppendingPathComponent("checkLists.sqlite") if coordinator!.addPersistentStoreWithType(NSsqliteStoreType,configuration: nil,URL: url,options: nil,error: &error) == nil { NSLog("Error1: \(error)") abort() } var managedObjectContext = NsmanagedObjectContext() managedObjectContext.persistentStoreCoordinator = coordinator let fetchrequest = NSFetchrequest() fetchrequest.entity = NSEntityDescription.entityForName("List",inManagedObjectContext: managedObjectContext) fetchrequest.sortDescriptors = [ NSSortDescriptor(key: "name",ascending: truE) ] let fetchedResultsController = NSFetchedResultsController( fetchrequest: fetchrequest,managedObjectContext: managedObjectContext,sectionNameKeyPath: nil,cachename: "ListFetchedResultsControllerCache" ) fetchedResultsController.performFetch(&error) if let error = error { NSLog("Error2: \(error)") abort() } let fetchedObjects: [AnyObject]? = fetchedResultsController.fetchedObjects if let fetchedObjects = fetchedObjects { NSLog("Fetched objects count: \(fetchedObjects.count)") for fetchedObject in fetchedObjects { NSLog("Fetched object: \(fetchedObject.description)") } } else { NSLog("Fetched objects array is nil") } let fetchedLists: [List]? = fetchedResultsController.fetchedObjects as? [List] if let fetchedLists = fetchedLists { NSLog("Fetched lists count: \(fetchedLists.count)") for fetchedList in fetchedLists { NSLog("Fetched list: \(fetchedList.description)") } } else { NSLog("Fetched lists array is nil") }
当我从应用程序的源代码执行它,在模拟器中运行应用程序时,控制台输出如下所示:
Fetched objects count: 3 Fetched object: <checkLists.List: 0x7a6866f0> (entity: List; id: 0x7a686020 <x-coredata://7A87B5BE-C2FA-4150-B9E3-879FDE07F0B9/List/p2> ; data: { name = "List 1"; }) Fetched object: <checkLists.List: 0x7a686930> (entity: List; id: 0x7a686030 <x-coredata://7A87B5BE-C2FA-4150-B9E3-879FDE07F0B9/List/p1> ; data: { name = "List 2"; }) Fetched object: <checkLists.List: 0x7a686970> (entity: List; id: 0x7a686040 <x-coredata://7A87B5BE-C2FA-4150-B9E3-879FDE07F0B9/List/p3> ; data: { name = "List 3"; }) Fetched lists count: 3 Fetched list: <checkLists.List: 0x7a6866f0> (entity: List; id: 0x7a686020 <x-coredata://7A87B5BE-C2FA-4150-B9E3-879FDE07F0B9/List/p2> ; data: { name = "List 1"; }) Fetched list: <checkLists.List: 0x7a686930> (entity: List; id: 0x7a686030 <x-coredata://7A87B5BE-C2FA-4150-B9E3-879FDE07F0B9/List/p1> ; data: { name = "List 2"; }) Fetched list: <checkLists.List: 0x7a686970> (entity: List; id: 0x7a686040 <x-coredata://7A87B5BE-C2FA-4150-B9E3-879FDE07F0B9/List/p3> ; data: { name = "List 3"; })
Fetched objects count: 3 Fetched object: <checkLists.List: 0x7a07df50> (entity: List; id: 0x7a07d7e0 <x-coredata://7A87B5BE-C2FA-4150-B9E3-879FDE07F0B9/List/p2> ; data: { name = "List 1"; }) Fetched object: <checkLists.List: 0x7a07e190> (entity: List; id: 0x7a07d7f0 <x-coredata://7A87B5BE-C2FA-4150-B9E3-879FDE07F0B9/List/p1> ; data: { name = "List 2"; }) Fetched object: <checkLists.List: 0x7a07e1d0> (entity: List; id: 0x7a07d800 <x-coredata://7A87B5BE-C2FA-4150-B9E3-879FDE07F0B9/List/p3> ; data: { name = "List 3"; }) Fetched lists array is nil
let fetchedLists: [List]? = fetchedResultsController.fetchedObjects as? [List]
当app在模拟器中运行时,会@L_801_23@一个List对象数组,但是当从单元测试执行时,它无法@L_801_23@nil.
以前,为了使List实体类可以在我的单元测试目标中访问,我已将它添加到此目标.因此,List类有两个目标.实际上,Swift已知有两个List类,每个目标对应一个:MyAppTarget.List和MyUnitTestTarget.List. Retched结果控制器返回MyAppTarget.List对象的数组,但在单元测试目标中,List被假定为MyUnitTestTarget.List类.这就是这行代码:
let fetchedLists: [List]? = fetchedResultsController.fetchedObjects as? [List]
从单元测试目标执行时@L_801_23@nil,而不是从主目标执行时@L_801_23@的正确数组.为了解决这个问题,我将其更改为:
let fetchedLists: [MyAppTarget.List]? = fetchedResultsController.fetchedObjects as? [MyAppTarget.List]
并使List类公开.在那次改变之后,它会像预期的那样工作
但是,对我来说,MyAppTarget.List无法转换为MyUnitTestTarget.List有点让人困惑.而且,这意味着我需要公开每个实体NsmanagedObject子类,以便在单元测试中使用它.到目前为止,我找不到更好的解决方案.
也许有更好的方法来解决这个问题.我没有看到告诉NSFetchedResultsController它应该返回主目标中的MyAppTarget.List和单元测试目标中的MyUnitTestTarget.List的选项.它将始终使用.xcdatamodeld文件中给定实体的配置.此外,即使有一种方法将MyAppTarget.List转换为单元测试中的MyUnitTestTarget.List,它仍然需要List类是公共的.
更新:
我找到了一种在运行时更改NSFetchedResultsController返回的实体类的方法.这是一个更清晰简单的解决方案:https://stackoverflow.com/a/25858758/514181
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