iOS Créer un CAGradientLayer horizontal avec plusieurs couleurs.


Exemple

// View to hold the CAGradientLayer.
let view: UIView = UIView(frame: CGRect(x: 0, y: 0, width: 320, height: 320))

// Initialize gradient layer.
let gradientLayer: CAGradientLayer = CAGradientLayer()

// Set frame of gradient layer.
gradientLayer.frame = view.bounds

// Color at the top of the gradient.
let topColor: CGColor = UIColor.greenColor().CGColor

// Color at the middle of the gradient.
let middleColor: CGColor = UIColor.blueColor().CGColor

// Color at the bottom of the gradient.
let bottomColor: CGColor = UIColor.blackColor().CGColor

// Set colors.
gradientLayer.colors = [topColor, middleColor, bottomColor]

// Set start point.
gradientLayer.startPoint = CGPoint(x: 0.0, y: 0.5)

// Set end point.
gradientLayer.endPoint = CGPoint(x: 1.0, y: 0.5)

// Insert gradient layer into view's layer heirarchy.
view.layer.insertSublayer(gradientLayer, atIndex: 0)

Résultat :

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