[ios] Change button background color using swift language

I am new to the swift language. Can someone tell me how to change the background color of a button using the swift language?

Swift 3

Color With RGB

btnLogin.backgroundColor = UIColor.init(colorLiteralRed: (100/255), green: (150/255), blue: (200/255), alpha: 1)

Using Native color

btnLogin.backgroundColor = UIColor.darkGray

After you connect the UIButton that you want to change its background as an OUtlet to your ViewController.swift file you can use the following:

 yourUIButton.backgroundColor = UIColor.blue

If you want to set backgroundColor of button programmatically then this code will surly help you

Swift 3 and Swift 4

self.yourButton.backgroundColor = UIColor.red

Swift 2.3 or lower

self.yourButton.backgroundColor = UIColor.redColor()

Using RGB

self.yourButton.backgroundColor = UIColor(red: 102/255, green: 250/255, blue: 51/255, alpha: 0.5)

or you can use float values

button.backgroundColor = UIColor(red: 0.4, green: 1.0, blue: 0.2, alpha: 0.5)

U can also play around the tintcolor and button image to indirectly change the color.

button.backgroundColor = UIColor.blue

Or any other color: red, green, yellow ,etc.

Another option is RGBA color:

button.backgroundColor = UIColor(red: 0.4, green: 1.0, blue: 0.2, alpha: 0.5)

/*Swift-5 update*/

let tempBtn: UIButton = UIButton(frame: CGRect(x: 5, y: 20, width: 40, height: 40))       
tempBtn.backgroundColor = UIColor.red

Try this, you need to add the 255 like so:

button.backgroundColor = UIColor(red: 102/255, green: 250/255, blue: 51/255, alpha: 0.5)

Update for xcode 8 and swift 3, specify common colors like:

button.backgroundColor = UIColor.blue

the Color() has been removed.

To change your background color of the botton use:

yourBtn.backgroundColor = UIColor.black

if you are using storyBoard make sure you have connected your storyBoard with your viewController and also that your items are linked.

if you don´t know how to do this check the next link:

How to connect ViewController.swift to ViewController in Storyboard?

Swift 4:

You can easily use hex code:

self.backgroundColor = UIColor(hexString: "#ff259F6C")

self.layer.shadowColor = UIColor(hexString: "#08259F6C").cgColor

Extension for hex color code

extension UIColor {
    convenience init(hexString: String, alpha: CGFloat = 1.0) {
        let hexString: String = hexString.trimmingCharacters(in: CharacterSet.whitespacesAndNewlines)
        let scanner = Scanner(string: hexString)
        if (hexString.hasPrefix("#")) {
            scanner.scanLocation = 1
        }
        var color: UInt32 = 0
        scanner.scanHexInt32(&color)
        let mask = 0x000000FF
        let r = Int(color >> 16) & mask
        let g = Int(color >> 8) & mask
        let b = Int(color) & mask
        let red   = CGFloat(r) / 255.0
        let green = CGFloat(g) / 255.0
        let blue  = CGFloat(b) / 255.0
        self.init(red:red, green:green, blue:blue, alpha:alpha)
    }
    func toHexString() -> String {
        var r:CGFloat = 0
        var g:CGFloat = 0
        var b:CGFloat = 0
        var a:CGFloat = 0
        getRed(&r, green: &g, blue: &b, alpha: &a)
        let rgb:Int = (Int)(r*255)<<16 | (Int)(g*255)<<8 | (Int)(b*255)<<0
        return String(format:"#%06x", rgb)
    }
}

You can set the background color of a button using the getRed function.
Let's assume you have:

1. A UIButton called button, and
2. You want to change button's background color to some known RBG value

Then, place the following code in the function where you want to change the background color of your UIButton

var r:CGFloat = 0
var g:CGFloat = 0
var b:CGFloat = 0
var a:CGFloat = 0

// This will be some red-ish color
let color = UIColor(red: 200.0/255.0, green: 16.0/255.0, blue: 46.0/255.0, alpha: 1.0) 

if color.getRed(&r, green: &g, blue: &b, alpha: &a){
    button.backgroundColor = UIColor(red: r, green: g, blue: b, alpha: a)
}