Jerland2 Jerland2 - 5 months ago 102
Swift Question

Save an array of colors to User Defaults - iOS Swift 2.3

I am wondering how to save an array of UIColors to user default.

I have the following code to save a single UIColor to user defaults, does anyone know how to modify this to allow me to store arrays of UIColor in NS User Defaults?



extension NSUserDefaults {

func colorForKey(key: String) -> UIColor? {
var color: UIColor?
if let colorData = dataForKey(key) {
color = NSKeyedUnarchiver.unarchiveObjectWithData(colorData) as? UIColor
}
return color
}



func setColor(color: UIColor?, forKey key: String) {
var colorData: NSData?
if let color = color {
colorData = NSKeyedArchiver.archivedDataWithRootObject(color)
}
setObject(colorData, forKey: key)
}

}






  • I am using Swift 2.3


Answer

You can do it in following way

let colors = [UIColor.whiteColor(), UIColor.greenColor()] // Array of colors
NSUserDefaults.standardUserDefaults().setObject(NSKeyedArchiver.archivedDataWithRootObject(colors), forKey: "ColorsKey") //For saving in NSUserDefaults
//For retrieving use following 
let decodedColorsData  = NSUserDefaults.standardUserDefaults().objectForKey("ColorsKey") as! NSData
let colorsArray = (NSKeyedUnarchiver.unarchiveObjectWithData(decodedColorsData) as! NSArray) as Array