swift - 在一个上下文中绘制实线和虚线

Question

我想在一个上下文中画一条虚线和一条实线。但是如果我先画一条虚线，第二条线也是一条虚线。那么如何清理context.setLineDash呢？我尝试了 context.beginContext()，但没有用。

代码如下:

if let context = UIGraphicsGetCurrentContext() {
    // The first line
    let startPoint = CGPoint(x: 20, y: rect.height/2)
    let endPoint = CGPoint(x: rect.width - 40, y: rect.height/2)
    context.move(to: startPoint)
    context.addLine(to: endPoint)
    context.setLineWidth(1)
    context.setLineDash(phase: 0, lengths: [4, 4])
    context.setStrokeColor(UIColor.progressDashLineColor.cgColor)
    context.strokePath()
    // Second line
    let startPoint1 = CGPoint(x: 20, y: rect.height/2 + 5)
    let endPoint1 = CGPoint(x: rect.width-120, y: rect.height/2)
    context.setStrokeColor(UIColor.mainColor.cgColor)
    context.setLineWidth(5)
    context.move(to: startPoint1)
    context.addLine(to: endPoint1)
    context.setLineCap(.round)
    context.strokePath()
}

Answer 1

在绘制实线之前将虚线设置为空数组。

context.setLineDash(phase: 0, lengths: [])

来自 CGContext 文档:

Pass an empty array to clear the dash pattern so that all stroke drawing in the context uses solid lines.

Documentation Link