Question

我有一个核心数据模式与实体＆＃34;用户＆＃34; 有两个属性＆＃34; firstName＆＃34;和＆＃34; secondName＆＃34;

这实际上是我获取结果的代码：

var content:[String] = []


func RequestData() {


    let appdelegate = NSApplication.shared().delegate as! AppDelegate
    let context = appdelegate.persistentContainer.viewContext

    let request = NSFetchRequest<NSFetchRequestResult>(entityName: "Kunden")
    request.returnsObjectsAsFaults = false

    do {

        let results = try context.fetch(request)

        if results.count > 0 {

            for result in results as! [NSManagedObject] {


                if let firstname = result.value(forKey: "firstname") as? String {

                    content.append(firstname)

                }

                if let secondname = result.value(forKey: "secondname") as? String {

                    content.append(secondname)

                }

            }


        }

        tbl_kunden.reloadData()


    } catch {

        print("ERROR")

    }


}

这很好用。问题是。我不相信那个

var content:[String] = []

是获取结果的正确变量。因为print（内容）的输出是：

[＆＃34; Max＆＃34;，＆＃34; Mustermann＆＃34;，＆＃34; Max2＆＃34;，＆＃34; Mustermann2＆＃34;，＆＃34; Max3＆＃34;，＆＃34; Mustermann3＆＃34;]

哪种变量类型最适合这种情况？

我认为结果应该是这样的：

+ID
++Max
++Mustermann

+ID
++Max2
++Mustermann2

+ID
++Max3
++Mustermann3

Answer 1

您应该创建属于User的子类的自定义NSManagedObject对象。 https://developer.apple.com/reference/coredata/nsmanagedobject

但如果您不需要自定义逻辑，则可以将变量更改为Int：[String] Dictionary：

var content:[Int: [String]] = [:]

并附加如下数据：

if let id = result.value(forKey: "firstname") as? Int {
    let firstName = result.value(forKey: "firstname") as? String ?? "Unknown"
    let secondName = result.value(forKey: "secondname") as? String ?? "Unknown"
    let user = [id: [firstName, lastName]]
    print("Fetched user: \(user.debugDescription)")
}

swift 3核心数据获取结果

1 个答案: