Question

我正在尝试存储Int，然后在主屏幕视图控制器上阅读它。

这就是我正在做的事情

将值传递给最终视图控制器，我也想调用一个函数来存储数据

var gameScore = [NSManagedObject]()

func doSomething() {
    if let myData = yourFinishScore {
        // proving I passed score
        print("Your score is \(myData)")


        self.finishLabel.text = "\(myData)"

        //call function to save data
        saveName(myData)
    } else {
        // no data was obtained
        print("No Data")
    }
}


//

func saveName(score: Int) {
    //1
    let appDelegate =
    UIApplication.sharedApplication().delegate as! AppDelegate

    let managedContext = appDelegate.managedObjectContext

    //2
    let entity =  NSEntityDescription.entityForName("Scores",
        inManagedObjectContext:managedContext)

    let yourScore = NSManagedObject(entity: entity!,
        insertIntoManagedObjectContext: managedContext)

    //3
    yourScore.setValue(score, forKey: "famousGuy")

    //print proves it's in thier correct
    print("your score is\(yourScore)")

    //4
    do {
        try managedContext.save()
        //5
        gameScore.append(yourScore)
        print("worked, I saved")
    } catch let error as NSError  {
        print("Could not save \(error), \(error.userInfo)")
    }
}

导航回第一个屏幕并尝试重新调用数据

override func viewWillAppear(animated: Bool) {
    super.viewWillAppear(animated)

    //1
    let appDelegate =
    UIApplication.sharedApplication().delegate as! AppDelegate

    let managedContext = appDelegate.managedObjectContext

    //2
    let fetchRequest = NSFetchRequest(entityName: "Scores")

    //3
    do {
        let results =
        try managedContext.executeFetchRequest(fetchRequest)
        famousGuysScore = results as! [NSManagedObject]
        } catch let error as NSError {
            print("Could not fetch \(error), \(error.userInfo)")
        }
    }


    if famousGuysScore.count > 0 {
        print("There are objects")
        self.myScore.text = "\(famousGuysScore[0])"
    } else {
        print("No objects")
    }

我假设某条线上的某处我没有正确保存数据。我认为吸烟枪与gameScore.append(yourScore)有关，我必须在这里做错事。

更新

非常肯定我只是对NSFetch做了一些错误，假设我需要迭代我提取的内容以取出属性

Swift CoreData存储Ints并检索它们

0 个答案: