ios - CoreData 不保存 Swift 4 Xcode 9

Question

我一生都无法弄清楚为什么我没有将任何内容保存到 CoreData。我在构建阶段添加了 CoreData.framework，但当我查看 Model.sqlite 时仍然没有任何内容。

应用程序委托(delegate)

lazy var persistentContainer: NSPersistentContainer = {

    let container = NSPersistentContainer(name: "Model")
    container.loadPersistentStores(completionHandler: {
        (storeDescription, error) in

        if let error = error as NSError? {
            fatalError("Unresolved error \(error), \(error.userInfo)")
        }
    })
    return container
}()

func saveContext () {
    let context = persistentContainer.viewContext
    if context.hasChanges {
        do {
            try context.save()
        } catch {
            let nserror = error as NSError
            fatalError("Unresolved error \(nserror), \(nserror.userInfo)")
        }
    }
}

然后在我的 MainViewController

var timer : Timer?
var distance = Measurement(value: 0, unit: UnitLength.meters)
var run: Run! //name of the entity
let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext

//...

private func saveRun() {
    print("saveRun")
    let newRun = Run(context: context)
    print("got past core data")
    newRun.distance = distance.value
    newRun.duration = Int16(seconds)
    newRun.timestamp = Date()

    for locations in locationList {
        let locationObject = Location(context: context)
        locationObject.timestamp = locations.timestamp
        locationObject.latitude = locations.coordinate.latitude
        locationObject.longitude = locations.coordinate.longitude
        newRun.addToLocations(locationObject)

        (UIApplication.shared.delegate as! AppDelegate).saveContext()

        run = newRun
    }
}

Answer 1

所以...我是个十足的白痴。它与我发布的代码一起工作。搞砸的原因是我编写代码时出错，并且不知道如何正确使用 Liya。感谢大家的帮助

@Francesco Deliro

很高兴知道。我会记住这一点

感谢大家的帮助