渐变颜色作为Swift4中UIButton的背景颜色

Question

I have a button and i'm trying to set its background color gradient.I have three hex values which i converted to RGB and written three values in my code and pass all the three values to the button frame. But when i run the app button background not changes according to the color i have set in the code. My code to get three color codes is this,

 let gradientColor = CAGradientLayer()
    gradientColor.frame = loginButton.frame
    let color1 = UIColor(red: 183, green: 46, blue: 79, alpha: 1)
    let color2 = UIColor(red: 232, green: 79, blue: 80, alpha: 1)
    let color3 = UIColor(red: 145, green: 21, blue: 79, alpha: 1)
    gradientColor.colors = [color1,color2,color3]
    self.loginButton.layer.addSublayer(gradientColor)

Answer 1

Try this and see:

@IBOutlet weak var loginButton: UIButton!
func testGradientButton() -> Void {
    let gradientColor = CAGradientLayer()
    gradientColor.frame = loginButton.frame
    gradientColor.colors = [UIColor.blue.cgColor,UIColor.red.withAlphaComponent(1).cgColor]
    self.loginButton.layer.insertSublayer(gradientColor, at: 0)
}

Here is result:

Also note: Values for RGB colors in your code, are much higher than its normal value. See your console log, it might printed following error:

[Graphics] UIColor created with component values far outside the expected range. Set a breakpoint on UIColorBreakForOutOfRangeColorComponents to debug. This message will only be logged once.

Divide all values with 255.0 and use insertSubLayer function.

let color1 = UIColor(red: 183.0/255.0, green: 46.0/255.0, blue: 79.0/255.0, alpha: 1)
let color2 = UIColor(red: 232.0/255.0, green: 79.0/255.0, blue: 80.0/255.0, alpha: 1)
let color3 = UIColor(red: 145.0/255.0, green: 21.0/255.0, blue: 79.0/255.0, alpha: 1)

Here is result with your color code values:

func testGradientButton() -> Void {
    let gradientColor = CAGradientLayer()
    gradientColor.frame = loginButton.frame
    let color1 = UIColor(red: 183.0/255.0, green: 46.0/255.0, blue: 79.0/255.0, alpha: 1)
    let color2 = UIColor(red: 232.0/255.0, green: 79.0/255.0, blue: 80.0/255.0, alpha: 1)
    let color3 = UIColor(red: 145.0/255.0, green: 21.0/255.0, blue: 79.0/255.0, alpha: 1)
    gradientColor.colors = [color1.cgColor,color2.cgColor,color3.cgColor]
    self.loginButton.layer.insertSublayer(gradientColor, at: 0)
}