Question

我有一个由id和detailText组成的Core数据实体。我的想法是，我的文本字段存储了它的内容以及某些id，这是我案例中的时间戳。现在，当用户第一次存储detailText时，它可以正常工作，但如果用户为特定id编辑detailText，我想删除旧的detailText并放入新的detailText。基本上我需要帮助在Swift / Core数据中编写下面的查询。

 UPDATE myEntity SET detailText = theNewDetailText WHERE ID = myID;

这些是我当前的保存和替换功能，我使用谓词来查找选择我的ID，但是我无法更新特定ID的相应detailText字段。

 func saveTextFromTextFieldToCoreData(textToSave: String){

    let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
    let managedContext = appDelegate.managedObjectContext

    let entityDescription =  NSEntityDescription.entityForName("GoalDetail", inManagedObjectContext:managedContext)

    let thingToSaveToCD = NSManagedObject(entity: entityDescription!, insertIntoManagedObjectContext: managedContext)


    print("received text to store and it's \(textToSave)")

    if  entityIsEmpty("GoalDetail") == true {
        thingToSaveToCD.setValue(data.timeStamp, forKey: "id")
        thingToSaveToCD.setValue(textToSave, forKey: "detailText")
        print("succesfully saved \(data.timeStamp) and \(textToSave)")

    } else {

        replaceTheValueFromCoreData()

    }
}

func replaceTheValueFromCoreData(){

    print("i have entered the delete core data item")
    let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
    let managedContext = appDelegate.managedObjectContext

    let fetchRequest = NSFetchRequest(entityName: "GoalDetail")
    let predicate = NSPredicate(format: "id == %@", data.timeStamp)
    fetchRequest.predicate = predicate

    //let entityDescription =  NSEntityDescription.entityForName("GoalDetail", inManagedObjectContext:managedContext)

    //let thingToSaveToCD = NSManagedObject(entity: entityDescription!, insertIntoManagedObjectContext: managedContext)

    do{
        let goal = try appDelegate.managedObjectContext.executeFetchRequest(fetchRequest)

        try managedContext.save()
    }

    catch{
        //error
    }

我已经通过谷歌和堆栈溢出，但到目前为止还没有设法执行此任务，所以任何帮助都非常感谢。

Answer 1

我已经解决了它

AppCompatTextView

编辑某个id的核心数据密钥的值

1 个答案: