Question

我需要根据值定义图形的颜色（例如：绿色表示0-50之间的值，红色表示50-100之间的值）。我尝试使用渐变颜色，但不是预期的颜色。请问有人能帮助我吗？我使用的是Swift 3。

I need the bottom of the graph to be green and upper part as red

Answer 1

声明此代码的课程

class Colors {
    var gl:CAGradientLayer!

    init() {
        let colorTop =  UIColor(red: 135.0/255.0, green: 155.0/255.0, blue: 36.0/255.0, alpha: 1.0).cgColor
        let colorcenter = UIColor(red: 186.0/255.0, green: 213.0/255.0, blue: 49.0/255.0, alpha: 1.0).cgColor
        let colorBottom = UIColor(red: 224.0/255.0, green: 241.0/255.0, blue: 142.0/255.0, alpha: 1.0).cgColor

        self.gl = CAGradientLayer()
        self.gl.colors = [colorTop, colorcenter, colorBottom]
        self.gl.locations = [0.5,0.8, 1.0]
    }
}

在viewDidLoad方法中进行declate。

let colors = Colors()
view.backgroundColor = UIColor.clear
let backgroundLayer = colors.gl
backgroundLayer?.frame = Yourview.frame
Yourview.layer.insertSublayer(backgroundLayer!, at: 0)

基于条形图值的渐变颜色

1 个答案: