最近对iOS 动画非常感兴趣,研究渐变圆的实现,在网上找了很多,看了看,没有直接实现的,找到一个最简单的实现方法,图层拼接,下面带大家先了解一下 CAGradientLayer .
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属性不多易懂
CAGradientLayer 坐标系
func createUI1() {
let gradientLayer = CAGradientLayer()
gradientLayer.frame = self.gradientView.bounds
self.gradientView.layer.addSublayer(gradientLayer)
// 颜色分配
gradientLayer.colors = [UIColor.blackColor().CGColor,UIColor.whiteColor().CGColor]
// 颜色分割线位置( 默认 0,1 )
gradientLayer.locations = [0,1]
// 起始点 坐标是 左上 (0,0) 右下 (1,1)
gradientLayer.startPoint = CGPointMake(0, 0)
// 结束点
gradientLayer.endPoint = CGPointMake(1, 0)
}
func createUI2() {
let gradientLayer = CAGradientLayer()
gradientLayer.frame = self.gradientView2.bounds
self.gradientView2.layer.addSublayer(gradientLayer)
gradientLayer.colors = [UIColor.redColor().CGColor,UIColor.greenColor().CGColor,UIColor.blueColor().CGColor]
gradientLayer.locations = [0.25,0.5,0.75]
gradientLayer.startPoint = CGPointMake(0, 0.5)
gradientLayer.endPoint = CGPointMake(1, 0.5)
}
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