iOS rainbow colors array

Question

I am setting up an array that has a transition throughout he colors of the rainbow. Right now I\'ve just manually entered the colors in the array but there are too many to m

Answer 1

A Swift 5, iOS 13 update to BJHomer answer

extension UIButton {
  func rainbowText() {
    var colors:[UIColor] = []
    let increment:CGFloat = 0.02
    for hue:CGFloat in stride(from: 0.0, to: 1.0, by: increment) {
      let color = UIColor(hue: hue, saturation: 1.0, brightness: 1.0, alpha: 1.0)
      colors.append(color)
    }
    var colorIndex = 0
    Timer.scheduledTimer(withTimeInterval: 0.1, repeats: true) { (timer) in
      if colorIndex < colors.count {
        self.setTitleColor(colors[colorIndex], for: .normal)
        colorIndex = colorIndex + 1
      } else {
        self.setTitleColor(colors[0], for: .normal)
        timer.invalidate()
      }
    }
  }
}

You call it like this ...

buttonOutlet.rainbowText()