我读过一些主题,但不适用于我...我尝试将渐变颜色应用于用 UIBezierPath
绘制的弧线。
问题是我的渐变填充了整个圆而不仅仅是圆环。
func layerWith(size: CGSize, color: UIColor) -> CALayer {
let layer: CAShapeLayer = CAShapeLayer()
var path: UIBezierPath = UIBezierPath()
let lineWidth: CGFloat = 2
layer.backgroundColor = nil
layer.path = path.cgPath
layer.frame = CGRect(x: 0, y: 0, width: size.width, height: size.height)
switch self {
case .ring:
path.addArc(withCenter: CGPoint(x: size.width / 2, y: size.height / 2),
radius: size.width / 2,
startAngle: 0,
endAngle: CGFloat(2 * M_PI),
clockwise: false);
layer.fillColor = UIColor.clear.cgColor
layer.strokeColor = color.cgColor
layer.lineWidth = lineWidth
let colorGradStart = UIColor(red: 0/255, green: 209/255, blue: 192/255, alpha: 1.0)
let colorGradEnd = UIColor(red: 00/255, green: 99/255, blue: 91/255, alpha: 1.0)
let gradient = CAGradientLayer()
gradient.frame = path.bounds
gradient.colors = [colorGradStart.cgColor, colorGradEnd.cgColor]
let shapeMask = CAShapeLayer()
shapeMask.path = path.cgPath
gradient.mask = shapeMask
layer.addSublayer(gradient)
}
return layer
}
所以这段代码,将渐变应用于所有填充的表单,我只需要弧线。
最佳答案
一种方法是将 CAShapeLayer 作为 mask 应用到渐变层。然后它会显示渐变。
关于ios - 将我的渐变设置为 BezierPath 的弧线,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/42901999/