macos - 绘制具有渐变颜色的字符串

Question

有没有办法在 NSView 中用渐变颜色绘制字符串？渐变不是背景，而是字母本身。也许一些面具，或者什么？

(其实不是文字，而是图标字体)

Answer 1

override func draw(_ rect: CGRect) {

    //Add gradient layer
    let gl = CAGradientLayer()
    gl.frame = rect
    gl.endPoint = CGPoint(x: 0, y: 0)
    gl.colors = [UIColor.red.cgColor, UIColor.blue.cgColor]
    layer.addSublayer(gl)

    //create a text layer mask
    let tl = CATextLayer()
    tl.frame = rect
    tl.string = "My String in Gradient"

    //Add mask to gradient layer
    gl.mask = tl

}

希望这对您有所帮助!