如何在Swift中更改UIBezierPath的颜色？

问题描述：

我有 UIBezierPath 的实例，我想将笔划的颜色更改为黑色以外的其他颜色。有没有人知道如何在Swift中执行此操作？

I have an instance of UIBezierPath and I want to change the color of the stroke to something other than black. Does anyone know how to do this in Swift?

答

使用Swift 3， UIColor 有 setStroke（） 方法。 setStroke（）具有以下声明：

With Swift 3, UIColor has a setStroke() method. setStroke() has the following declaration:

func setStroke()

将后续笔划操作的颜色设置为接收器所代表的颜色。

Sets the color of subsequent stroke operations to the color that the receiver represents.

因此，您可以像这样使用 setStroke（）：

Therefore, you can use setStroke() like this:

strokeColor.setStroke() // where strokeColor is a `UIColor` instance

下面的Playground代码显示了如何使用 setStroke（）与 UIBezierPath 一起，以便在 UIView 子类中绘制一个绿色填充颜色和浅灰色笔触颜色的圆圈：

The Playground code below shows how to use setStroke() alongside UIBezierPath in order to draw a circle with a green fill color and a light grey stroke color inside a UIView subclass:

import UIKit
import PlaygroundSupport

class MyView: UIView {

    override func draw(_ rect: CGRect) {
        // UIBezierPath
        let newRect = CGRect(
            x: bounds.minX + ((bounds.width - 79) * 0.5 + 0.5).rounded(.down),
            y: bounds.minY + ((bounds.height - 79) * 0.5 + 0.5).rounded(.down),
            width: 79,
            height: 79
        )
        let ovalPath = UIBezierPath(ovalIn: newRect)

        // Fill
        UIColor.green.setFill()
        ovalPath.fill()

        // Stroke
        UIColor.lightGray.setStroke()
        ovalPath.lineWidth = 5
        ovalPath.stroke()
    }

}

let myView = MyView(frame: CGRect(x: 0, y: 0, width: 200, height: 300))
PlaygroundPage.current.liveView = myView

如何在Swift中更改UIBezierPath的颜色？

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