init(colorLiteralRed:,green:,blue:,alpha:) deprecated in Swift 4
init(colorLiteralRed:green:blue:alpha:)
is intended to be used with Color Literals which are managed by development tools.
Why don't you use normal init(red:green:blue:alpha:)
?
let startingColorOfGradient = UIColor(red: 255.0/255.0, green:
255.0/255.0, blue: 255.0/255.0, alpha: 1.0).cgColor
let endingColorOFGradient = UIColor(red: 251.0/255.0, green:
247.0/255.0, blue: 234.0/255.0, alpha: 1.0).cgColor
let gradient: CAGradientLayer = CAGradientLayer()
(Writing like 234.0/255.0
is not mandatory, in the context as above in Swift. But it prevents Swift compiler to interpret 234/255
as an integer division in some other contexts.)
You can simply use below method of UIColor class to instantiate color from Red, Green, Blue, Alpha.
Note: Red, Green, Blue, and Alpha have a value ranging from 0 to 1.
let colorStart = UIColor(red:0.1 , green: 0.2, blue: 0.5, alpha: 1.0)
let colorEnd = UIColor(red:0.21 , green: 0.32, blue: 0.15, alpha: 1.0)
func createGradientLayer() {
gradientLayer = CAGradientLayer()
gradientLayer.frame = self.view.bounds
gradientLayer.colors = [colorStart.CGColor, colorEnd.CGColor]
self.view.layer.addSublayer(gradientLayer)
}
To create gradient layer you can take reference from
https://www.appcoda.com/cagradientlayer/
Another way : https://developer.apple.com/documentation/uikit/uicolor/1621925-init
init(displayP3Red: CGFloat, green: CGFloat, blue: CGFloat, alpha: CGFloat)
Initializes and returns a color object using the specified opacity and RGB component values in the Display P3 color space.
you can use displayP3Red
instead of colorLiteralRed
let startingColorOfGradient = UIColor(displayP3Red: 255/255, green: 255/255, blue: 255/255, alpha: 1.0).cgColor
let endingColorOFGradient = UIColor(displayP3Red: 251/255, green: 247/255, blue: 234/255, alpha: 1.0).cgColor
let gradient: CAGradientLayer = CAGradientLayer()