快速保存标签数据 [英] Save data of a Label in swift

问题描述

我在settingsController中有一个TextField，可以修改从pickerView中选择一个名称，问题是这样的:当我更改textField的文本时，我也更改了另一个控制器中标签的文本，但是当我关闭并重新打开我的应用程序，标签为空，我无法找到一种方法来保存使用pickerView输入的文本.

I have a TextField in my settingsController that i can modify selecting a name from a pickerView, the problem is this : when i change the text of my textField i also change the text of a label in another controller, it work but when i close and reopen my app the label is empty, i can't find a way to save the text that i give it with the pickerView.

我在settingsController中的代码

My code in the settingsController

override func viewDidLoad() {
        super.viewDidLoad()


        var defaults: NSUserDefaults = NSUserDefaults.standardUserDefaults()

        if let firstNameIsNotNill = defaults.objectForKey("firstName") as? String {
            self.currencyLabel.text = defaults.objectForKey("firstName") as String
        }

        currencyLabel.delegate = self
}

func currencyDoneClicked(sender: UIBarButtonItem) {

        var myRow = picker.selectedRowInComponent(0)
        currencyLabel.text = pickerData.objectAtIndex(myRow) as NSString
        DataManager.sharedInstance.contenitore = currencyLabel.text
var defaults: NSUserDefaults = NSUserDefaults.standardUserDefaults()
            defaults.setObject(self.currencyLabel.text, forKey: "firstName")
            defaults.synchronize()     
        }

DataManager:

DataManager :

import UIKit

class DataManager: NSObject {

    class var sharedInstance:DataManager {
        get {
            struct Static {
                static var instance : DataManager? = nil
                static var token : dispatch_once_t = 0
            }

            dispatch_once(&Static.token) { Static.instance = DataManager() }

            return Static.instance!
        }
    }

    var contenitore : String!
}

在另一个控制器中:

    override func viewDidLoad() {
        super.viewDidLoad()

        labelCurrency.text = DataManager.sharedInstance.contenitore
}

推荐答案

只需使用NSUserDefaults.

NSUserDefaults.standardUserDefaults().setValue(textField.text, forKey: "savedTextField")

然后，当您再次启动时，在viewDidLoad或viewWillAppear中填充该字段.

Then, when you start up again, populate the field in viewDidLoad or viewWillAppear.

if let text = NSUserDefaults.standardUserDefaults().stringForKey("savedTextField") {    
   textField.text = text
}

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