將uipickerview顏色保存在核心數據中

Question

我知道我想要的，但我只是在努力以正確的方式進行操作。 我正在嘗試實現一個小型應用程序，該應用程序允許用戶通過提供類別名稱，描述然后從uipickerview中選擇顏色來添加類別。 我已經成功將名稱和描述保存在核心數據中。 我只是在努力如何獲取選定的顏色字符串並將其保存在核心數據中。 任何幫助將不勝感激。 到目前為止，這是我編寫的代碼：

import UIKit
import CoreData

class NewCategory: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate {

    let categoryColor = ["Red","Yellow","Black","White", "Green", "Blue"]

    // MARK: - Properties
    let context = (UIApplication.sharedApplication().delegate as! AppDelegate).managedObjectContext

    // MARK: Outlets
    @IBOutlet weak var name: UITextField!
    @IBOutlet weak var descriptionField: UITextView!
    @IBOutlet weak var pickerView: UIPickerView!
    @IBOutlet weak var colorLabel: UILabel!


    // MARK: Actions
    @IBAction func saveBtn(sender: AnyObject) {

        if name.text == "" || name.text.isEmpty || name.text.isEmpty{
            var alert = UIAlertController(title: "WARNING !!!", message: "Couldn't add category. Fill all fields.", preferredStyle: UIAlertControllerStyle.Alert)
            alert.addAction(UIAlertAction(title: "Dismiss", style: UIAlertActionStyle.Default, handler: nil))
            self.presentViewController(alert, animated: true, completion: nil)
        } else {
            createCategory()        }

    }

    // MARK: View settings
    override func viewDidLoad() {
        super.viewDidLoad()
        self.pickerView.dataSource = self
        self.pickerView.delegate = self
    }

    // Custom functions
    func createCategory() {
        let entity = NSEntityDescription.entityForName("Category", inManagedObjectContext: context!)
        let category = Category(entity: entity!, insertIntoManagedObjectContext: context)

            category.name = name.text
            category.descript = descriptionField.text
            category.color = colorLabel
            println(category.name)
            context?.save(nil)
    }

    func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
        return 1
    }

    func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        return categoryColor.count
    }

    func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String! {
        return categoryColor[row]
    }

    func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        if (row == 0) {
            colorLabel.backgroundColor = UIColor.redColor()
        }
        else if(row == 1) {
            colorLabel.backgroundColor = UIColor.yellowColor()
        }
        else if(row == 2) {
            colorLabel.backgroundColor = UIColor.blackColor()
        }
        else if(row == 3) {
            colorLabel.backgroundColor = UIColor.whiteColor()
        }
        else if(row == 4) {
            colorLabel.backgroundColor = UIColor.greenColor()
        }
        else {
            colorLabel.backgroundColor = UIColor.blueColor()
        }
    }
}

Answer 1

您可以通過以下方式獲得顏色名稱：

let index = pickerView.selectedRowInComponent(0)
let color = categoryColor[index]

例如，您可以像下面這樣在函數中使用它：

func createCategory() {
        let entity = NSEntityDescription.entityForName("Category", inManagedObjectContext: context!)
        let category = Category(entity: entity!, insertIntoManagedObjectContext: context)

            category.name = name.text
            category.descript = descriptionField.text

            let index = pickerView.selectedRowInComponent(0)
            let color = categoryColor[index]
            category.color = color // (assuming color is a String)
            println(category.name)
            context?.save(nil)
    }

Answer 2

在didSelectRow從categoryColor獲取值

func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
       let colorString = categoryColor[row] as! String

        // Save the colorString into Core data

    }