Question

我在我的应用程序开发中遇到了一个愚蠢的问题好几个小时...... 有人可以帮我解决这个问题吗？

除了＆＃34; game_releasedate＆＃34;以外我没有打印所有数据的问题。数据是＆＃34;日期＆＃34;数据

    let foundgame = GameClass()

    //Look into Database

    let request = NSFetchRequest<NSFetchRequestResult>(entityName: "Game_BDD")
    request.predicate = NSPredicate(format: "game_barcode == %@", barcode)
    print (barcode)


    //Autofill the game name, console, region, etc...
    do {
        let result = try context.fetch(request)
        print (result.count)
        if result.count > 0 {
            foundgame.game_Name = (result[0] as AnyObject).value(forKey: "game_name") as! String
            foundgame.game_Console = (result[0] as AnyObject).value(forKey: "game_console") as! String
            foundgame.game_Genre = (result[0] as AnyObject).value(forKey: "game_genre") as! String
            foundgame.game_Publisher = (result[0] as AnyObject).value(forKey: "game_publisher") as! String
            foundgame.game_Region = (result[0] as AnyObject).value(forKey: "game_country") as! String
            let date = (result[0] as AnyObject).value(forKey: "game_releasedate") as! NSDate

            print(date)

         }
        else
        {
            foundgame.game_Name = "Barcode Not found"
        }

    }
    catch{
        print("Error looking in the DB")
    }

谢谢

编辑：

这就是我将游戏数据放入数据库的方式：

        let formatdate = DateFormatter()
        formatdate.dateFormat = "dd/mm/yyyy"
        print(gametxt[3])


        let newGame = NSEntityDescription.insertNewObject(forEntityName: "Game_BDD", into: context) as NSManagedObject
        newGame.setValue(gametxt[0], forKey: "game_console")
        newGame.setValue(gametxt[1], forKey: "game_genre")
        newGame.setValue(gametxt[2], forKey: "game_name")
        newGame.setValue(gametxt[3], forKey: "game_country")
        newGame.setValue(gametxt[4], forKey: "game_publisher")
        newGame.setValue(gametxt[5], forKey: "game_productid")
        newGame.setValue(gametxt[6], forKey: "game_barcode")
        newGame.setValue(formatdate.date(from: gametxt[7]), forKey: "game_releasedate")

Answer 1

将日期更改为有效日期：

//如果您的日期为Date格式

let date = Date()
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "dd/MM/yyyy"

print(dateFormatter.string(from: date)) // outputs : 17/09/2017

//如果您的日期为String格式

let dateString = "04/14/97"
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "mm/dd/yy"
let date = dateFormatter.date(from: dateString)
dateFormatter.dateFormat = "dd/mm/yyyy"

print(dateFormatter.string(from: date!)) // outputs : 14/04/1997

为什么我无法在核心数据中打印存储的日期？迅速

1 个答案: