UIView:在相同的给定方向上无限地设置渐变动画？

// 创建CAGradientLayer对象
let gradientLayer = CAGradientLayer()
gradientLayer.frame = view.bounds
gradientLayer.colors = [UIColor.red.cgColor, UIColor.blue.cgColor]
gradientLayer.startPoint = CGPoint(x: 0, y: 0.5)
gradientLayer.endPoint = CGPoint(x: 1, y: 0.5)

// 将CAGradientLayer添加到UIView上
view.layer.addSublayer(gradientLayer)

// 创建CABasicAnimation对象
let animation = CABasicAnimation(keyPath: "colors")
animation.fromValue = [UIColor.red.cgColor, UIColor.blue.cgColor]
animation.toValue = [UIColor.blue.cgColor, UIColor.red.cgColor]
animation.duration = 2.0
animation.repeatCount = .infinity

// 将动画添加到UIView的layer上
gradientLayer.add(animation, forKey: "gradientAnimation")