问题描述
我想在我的应用程序中创建这种设计(已添加图片)。我已尝试使用复制器层创建此图案,但如何管理此图案中的不同颜色?
let replicatorLayer = CAReplicatorLayer()
replicatorLayer.frame.size = viewForReplicatorLayer.frame.size
replicatorLayer.masksToBounds = true
replicatorLayer.instanceColor = UIColor.red.cgColor
let radius = viewForReplicatorLayer.frame.size.width/2 - 30
let circum = 2 * CGFloat.pi * radius
let num = circum/10 + 21
let instanceCount = num//100//viewForReplicatorLayer.frame.width / image!.size.width
replicatorLayer.instanceCount = Int(instanceCount)//Int(ceil(instanceCount))
replicatorLayer.instanceDelay = 1.0
viewForReplicatorLayer.layer.addSublayer(replicatorLayer)
let layer = CALayer()
let x = viewForReplicatorLayer.bounds.midX
layer.frame = CGRect(x: x,y: 0,width: 3,height: 10)
layer.backgroundColor = UIColor.red.cgColor
replicatorLayer.addSublayer(layer)
let angle = Float.pi * 2 / Float(instanceCount)
replicatorLayer.instanceTransform = CATransform3DMakeRotation(CGFloat(angle),1)
解决方法
您从 RGB (1; 0.5; 0) 的橙色开始,然后上升到 RGB (1; 0; 1) 的紫色。
R: 1 -> 1
G: 0.5 -> 0
B: 0 -> 1
所以,我们只需要复制:
replicatorLayer.instanceBlueOffset = 1 / Float(instanceCount)
replicatorLayer.instanceGreenOffset = -(1.0 / Float(instanceCount * 2)) //There is the 2 factor because because this color speed is twice less the blue one
其他一些变化:
replicatorLayer.instanceColor = UIColor(red: 1,green: 0.5,blue: 0,alpha: 1).cgColor
...
layer.backgroundColor = UIColor.white.cgColor
,
我会用你想要的颜色创建一个圆锥渐变层,然后使用复制器层来掩盖这个渐变层。
创建具有所需颜色的渐变层:
let orangeColor = UIColor(red: 236.0 / 255.0,green: 184.0 / 255.0,blue: 63.0 / 255.0,alpha: 1.0)
let purpleColor = UIColor(red: 172.0 / 255.0,green: 56.0 / 255.0,blue: 213.0 / 255.0,alpha: 1.0)
let gradientLayer = CAGradientLayer()
gradientLayer.frame = viewForReplicatorLayer.bounds
gradientLayer.type = .conic
gradientLayer.colors = [
orangeColor.cgColor,purpleColor.cgColor,purpleColor.withAlphaComponent(0).cgColor
]
let center = CGPoint(x: 0.5,y: 0.5)
gradientLayer.startPoint = center
gradientLayer.endPoint = CGPoint(x: 0.5,y: 0)
viewForReplicatorLayer.layer.addSublayer(gradientLayer)
将复制层设置为渐变层的蒙版:
gradientLayer.mask = replicatorLayer
由于我们使用复制层作为掩码,因此无需再将其添加为子层,因此请从现有代码中删除以下内容:
viewForReplicatorLayer.layer.addSublayer(replicatorLayer)