swift - Random uicolor from string array -

i wish pick change background color of swift application calling random color predetermined string array such (red, green, pink).

so have array , want background color randomly selected 1 of thoses colors.

using self.bg.background color resulted in xcode saying string not converted uicolor

here's example of 1 way this:

import uikit  extension array {   func randomelement() -> element {     return self[int(arc4random_uniform(uint32(self.count)))]   } }  extension uicolor {   enum colorenum: string {     case red   // = "red"     case green // = "green"     case blue  // = "blue"     case pink  // = "pink"      func tocolor() -> uicolor {       switch self {       case .red:         return .redcolor()       case .green:         return .greencolor()       case .blue:         return .bluecolor()       case .pink:         return uicolor(hue: 1.0, saturation: 0.25, brightness: 1.0, alpha: 1.0)       }     }   }    static func fromstring(name: string) -> uicolor? {     return colorenum(rawvalue: name)?.tocolor()   } }  let colors = ["red", "green", "pink"] // stored string uicolor.fromstring(colors.randomelement())  let enumcolors: [uicolor.colorenum] = [.red, .green, .pink] // stored enum enumcolors.randomelement().tocolor()