iOS 9,10 CoreData:无法在路径中加载优化模型

Question

我创建了新版本的CoreData模型并将现有模型迁移到它.应用程序在iOS 9+上没有任何问题,但对于iOS 9和10我收到此错误:

2017-10-22 19:28:37.081 CafeManager [16654:1918728] CoreData:无法在路径'/ Users/dj-glock/Library/Developer/CoreSimulator/Devices/A81AA9C4-7B59-4422-BA0A-0FD0D1A05205​​中加载优化模型/data/Containers/Bundle/Application/DD66571C-4EB6-4A8B-A99B-B447DD0FFFBA/CafeManager.app/CafeManager.momd/CafeManager v2.omo'

iOS 10:

CoreData:注释:无法在路径'/ Users/dj-glock/Library/Developer/CoreSimulator/Devices/3708F142-3BD0-4C70-8515-217B7785D285/data/Containers/Bundle/Application/3842402F-BEAE-47CB中加载优化模型-8C27-EC6CA7D76B03/CafeManager.app/CafeManager.momd/CafeManager v2.omo'

我检查了很多类似的问题,但没有为我找到解决方案.我试图在模拟器上重新安装应用程序,重新启动等等.有人可以提供建议吗？

文件夹包含以下文件:

适用于iOS 9的AppDelegate CoreData堆栈:

// MARK: - Core Data stack for iOS 8+
static var managedObjectContext: NSManagedObjectContext = {
    var applicationDocumentsDirectory: URL = {
        let urls = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
        return urls[urls.count-1]
    }()

    var managedObjectModel: NSManagedObjectModel = {
        let modelURL = Bundle.main.url(forResource: "CafeManager", withExtension: "momd")!
        return NSManagedObjectModel(contentsOf: modelURL)!
    }()

    var persistentStoreCoordinator: NSPersistentStoreCoordinator = {
        let a = managedObjectModel.entities
        let coordinator = NSPersistentStoreCoordinator(managedObjectModel: managedObjectModel)
        let url = applicationDocumentsDirectory.appendingPathComponent("SingleViewCoreData.sqlite")
        print(url)
        do
        {
            let options = [NSMigratePersistentStoresAutomaticallyOption: true, NSInferMappingModelAutomaticallyOption: true]
            try coordinator.addPersistentStore(ofType: NSSQLiteStoreType, configurationName: nil, at: url, options: options)
        } catch {
            NSLog("Error initializing smStore for iOS 8+ - \(error.localizedDescription)")
        }
        return coordinator
    }()
    let coordinator = persistentStoreCoordinator
    var managedObjectContext = NSManagedObjectContext(concurrencyType: .mainQueueConcurrencyType)
    managedObjectContext.persistentStoreCoordinator = coordinator
    return managedObjectContext
}()

Apple开发者论坛

可能重复此问题.

Answer 1

这似乎是<iOS 11上优化模型版本的问题.只需使用未经优化的.mom模型版本(CafeManager v2.mom).

以下是我修复它的方法:

public func managedObjectModel() -> NSManagedObjectModel {
    let omoURL = modelBundle.url(forResource: name, withExtension: "omo", subdirectory: modelDirectoryName)
    let momURL = modelBundle.url(forResource: name, withExtension: "mom", subdirectory: modelDirectoryName)
    guard var url = omoURL ?? momURL else { fatalError("model version \(self) not found") }
    // Use unoptimized model version < iOS 11
    if #available(iOS 11, *) {} else { if let momURL = momURL { url = momURL} }
    guard let model = NSManagedObjectModel(contentsOf: url) else { fatalError("cannot open model at \(url)") }
    return model
}

如果你在想,我想要我的速度,为什么我会使用未经优化的东西,请阅读这个答案.