ios - UserDefaults 不显示数据？

Question

我正在呈现一个带有一些文本字段和按钮的 View ，用户可以在该文本字段中输入一些数据，当用户单击保存按钮时，该数据将保存在 NSUserdefaults 中并显示在另一个 View 上，但它不起作用..任何建议请..

View2 code Which is presented over view1

//The default key value
var _billingAddress = "billingAddress"

//The address text field in present view
@IBOutlet weak var address: UITextField!


//The button action code
 @IBAction func saveBtn(sender: AnyObject) {

    let defaults = NSUserDefaults.standardUserDefaults()
    defaults.setValue(address.text, forKey:_billingAddress)

 }

View1 code to access the key value data

//Label where i want to show the saved value
@IBOutlet weak var billingAddresh: UILabel!

    let defaults = NSUserDefaults.standardUserDefaults()
    if let name = defaults.stringForKey(_billingAddress)
        //Here it shows the error use of unresolved identifier _billingAddress
    {
        billingAddresh.text = name
    }

它没有显示任何值(value)谢谢您的帮助..

Answer 1

当您添加时间时，我们需要defaults.synchronize()

let defaults = NSUserDefaults.standardUserDefaults()
defaults.setValue(address.text, forKey:"billingAddress")

// if you want use else ignore 
defaults.synchronize()

检索的是

let defaults = NSUserDefaults.standardUserDefaults()
if let name = defaults.stringForKey("billingAddress") // not "_billingAddress"
{
    billingAddresh.text = name
}

// no need in here 
defaults.synchronize()