How to use UISwitch to save settings

 

This tutorial has been updated for X code 7.3 & swift 2.2

First lets set up the x code project as usual. Create new single view application X code project. Set the values as follows and save it on your desktop.

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Go to main storyboard and select view controller. Set its size iPhone 4-inch in attribute section.

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Add label & switch to the main storyboard

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Change labels text to ”White Background”

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Connect switch as outlet to swift file

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Connect switch as action to swift file

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Add following code in view did load. This will set initial value for switch

override func viewDidLoad() {
    super.viewDidLoad()

    mySwitch.on = false
    self.view.backgroundColor = UIColor.lightGrayColor()

    // Do any additional setup after loading the view, typically from a nib.
}

Add following code in switch changed button

@IBAction func switchChanged(sender: UISwitch) {

    if sender.on {
        self.view.backgroundColor = UIColor.whiteColor()
    }
    else {
        self.view.backgroundColor = UIColor.lightGrayColor()
    }

}

Now build and run the app in iPhone 5s. Turn on the switch & turn off the switch.

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Download X code file

Challenge Save switch state with NSUserdefaults

(Hint: save the bool value with NSUserdefaults)

Uber Challenge Save background color with NSUserdefaults

(Hint: Use NSKeyedArchiver)

Download Challenge Solution
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