Saving And Loading An Integer On Xcode Swift

Question

I am trying to save an integer so it shows up after I switch the page or close the game. I made this to change the number but how do I save that number when I switch pages and load it when I go back to that page.

Change Code:

@IBAction func MoneyPress(sender: AnyObject) {

Money += 1

var MoneyNumberString:String = String(format: "Dollars:%i", Money)
self.DollarsLabel.text = (string: MoneyNumberString)

}

Blake Morgan · Accepted Answer · 2014-12-24 22:33:00Z

4

If it isn't a lot of data, the strategy I use to save data, pass it between pages, and persist it between app runs is to store the value in NSUserDefaults.

Setting A Value: When you first get or when you change the data, store it in NSUserDefaults.

@IBAction func MoneyPress(sender: AnyObject) {
    Money += 1
    var MoneyNumberString:String = String(format: "Dollars:%i", Money)
    self.DollarsLabel.text = (string: MoneyNumberString)
    let defaults: NSUserDefaults = NSUserDefaults.standardUserDefaults() //This class     variable needs to be defined every class where you set or fetch values from NSUserDefaults
    defaults.setObject(MoneyNumberString, forKey: "money")
    defaults.synchronize() //Call when you're done editing all defaults for the method.
}

Loading A Value: When you need to get the values, just grab it from NSUserDefaults.

@IBAction func loadButton(sender: UIButton) {
    let defaults: NSUserDefaults = NSUserDefaults.standardUserDefaults()
    var money = defaults.valueForKey("money") as? String
    dollarLabel.text! = money
}

To remove the stored data, all you need to do is call the removeObjectForKey function for each key previously set.

let defaults: NSUserDefaults = NSUserDefaults.standardUserDefaults()
defaults.removeObjectForKey("money")
defaults.synchronize()

Helpful Source on NSUserDefaults:

NSUserDefulats Class Reference: Link here.

edited Dec 24, 2014 at 22:33

answered Dec 24, 2014 at 22:04

Blake Morgan

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8 Comments

SRL Over a year ago

I am a little confused on the fetching a value part. Is there a way to have a save button which would save the data of the Dollar Label and then have a load button to bring it back to what was saved?

Blake Morgan Over a year ago

The answer depends on whether or not the label is in the same view as the button or not. See if my edited code in the "Loading A Value" section helps.

SRL Over a year ago

It works now but there is one more problem. When I load it up and then I press the button to add the money, it starts from 0 again instead of the number that it showed. Im not sure but that might have had to do with how it made me put a ! at the end of money on dollarLabel.text! = money!

Blake Morgan Over a year ago

Set the Dollar Label to equal the saved value in viewWillAppear. It will check the defaults every time the user goes to that view. You can add viewDidApper with this code:

override func viewWillAppear(animated: Bool) { let defaults: NSUserDefaults = NSUserDefaults.standardUserDefaults(); var money = defaults.valueForKey("money") as? String; dollarLabel.text! = money; super.viewWillAppear(animated)}

. Also, if you liked this answer and found it useful, please utopia it and select is as the right answer.

SRL Over a year ago

First, it made me add and ! after money. Then, I tried it out and it crashed when I tried to switch views. And yes I will click that it is the right answer when it works for me.

|

Community · Accepted Answer · 2020-06-20 09:12:55Z

4

You can use NSUserDefaults for this.

Save Value

NSUserDefaults.standardUserDefaults().setInteger(money, forKey: "MoneyKey");

Retrieve Value

NSUserDefaults.standardUserDefaults().integerForKey("MoneyKey");

So can retrieve the value in viewDidLoad and load the data:

override func viewDidLoad()
{
    super.viewDidLoad()
    loadWebView()
    var money = NSUserDefaults.standardUserDefaults().integerForKey("MoneyKey");
}

When you come to the view for the first time the value of money will be 0.

Remove Value

If you need to remove a value from NSUserdefaults, you can use:

NSUserDefaults.standardUserDefaults().removeObjectForKey("MoneyKey")

edited Jun 20, 2020 at 9:12

CommunityBot

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answered Dec 24, 2014 at 22:05

Midhun MP

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Saving And Loading An Integer On Xcode Swift

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