How to I properly set UIColor from int?

Question

I am trying to set the textColor of a UITextView by assigning it a value.

Earlier in the program I have

textView.textColor         


        

Answer 1

Swift extension version

public extension UIColor {
public convenience init(rgbValue: T, alpha: CGFloat = 1) where T: BinaryInteger {
    guard rgbValue > 0 else {
        self.init(red: 0, green: 0, blue: 0, alpha: alpha)
        return
    }

    guard rgbValue < 0xFFFFFF else {
        self.init(red: 1, green: 1, blue: 1, alpha: alpha)
        return
    }

    let r: CGFloat = CGFloat(((rgbValue & 0xFF0000) >> 16) / 0xFF)
    let g: CGFloat = CGFloat((rgbValue & 0x00FF00) >> 8 / 0xFF)
    let b: CGFloat = CGFloat((rgbValue & 0x0000FF) / 0xFF)

    self.init(red: r, green: g, blue: b, alpha: alpha)
}

}

usage:

let white =  UIColor(rgbValue: 16777215)
let red =    UIColor(rgbValue: 16711680)
let green =  UIColor(rgbValue: 0x00FF00)
let blue =   UIColor(rgbValue: 0x0000FF)
let yellow = UIColor(rgbValue: 0xFFFF00)
let black =  UIColor(rgbValue: 0)