UIBezierPath 没有出现

Question

我尝试为滑块绘制一个分隔符，它必须位于滑块长度的 1/3 的位置。 slider body绘制成功，买separator - 不，不显示。

代码如下

class RangeSliderTrackLayer:CALayer {
weak var rangeSlider:RangeSlider?

override func drawInContext(ctx: CGContext) {

    if let slider = rangeSlider {
        let cornerRadius = bounds.height * 1 / 2.0
        let path = UIBezierPath(roundedRect: bounds, cornerRadius: cornerRadius)
        CGContextAddPath(ctx, path.CGPath)

        CGContextSetFillColorWithColor(ctx, UIColor.lightGrayColor().CGColor)
        CGContextAddPath(ctx, path.CGPath)
        CGContextFillPath(ctx)

        CGContextSetFillColorWithColor(ctx, UIColor.yellowColor().CGColor)
        let lowerValuePosition = CGFloat(40)
        let upperValuePosition = CGFloat(80)
        let rect = CGRect(x: lowerValuePosition, y: 0.0, width: upperValuePosition - lowerValuePosition, height: bounds.height)
        CGContextFillRect(ctx, rect)

        let separatorPath = UIBezierPath()
        var x = bounds.width / 3
        var y = bounds.height
        separatorPath.moveToPoint(CGPoint(x: x, y: y))
        separatorPath.addLineToPoint(CGPoint(x: x + 2, y: y))
        separatorPath.addLineToPoint(CGPoint(x: x + 2, y: 0))
        separatorPath.addLineToPoint(CGPoint(x: x, y: 0))
        separatorPath.closePath()
        UIColor.whiteColor().setFill()
        separatorPath.stroke()
    }


}

}

我做错了什么？

Answer 1

您正在呼叫 setFill() 但随后呼叫 stroke()。填充和描边是两个不同的东西。所以，你要么想要：

继续使用 setFill() 设置填充颜色，然后调用 fill() 而不是 stroke():

let separatorPath = UIBezierPath()
var x = bounds.width / 3
var y = bounds.height
separatorPath.moveToPoint(CGPoint(x: x, y: y))
separatorPath.addLineToPoint(CGPoint(x: x + 2, y: y))
separatorPath.addLineToPoint(CGPoint(x: x + 2, y: 0))
separatorPath.addLineToPoint(CGPoint(x: x, y: 0))
separatorPath.closePath()
UIColor.whiteColor().setFill()
// separatorPath.stroke()
separatorPath.fill()

或者调用 stroke() 就像你不是，而不是调用 setFill()，而是设置 lineWidth 并调用 setStroke():

let separatorPath = UIBezierPath()
var x = bounds.width / 3
var y = bounds.height
separatorPath.moveToPoint(CGPoint(x: x, y: y))
separatorPath.addLineToPoint(CGPoint(x: x + 2, y: y))
separatorPath.addLineToPoint(CGPoint(x: x + 2, y: 0))
separatorPath.addLineToPoint(CGPoint(x: x, y: 0))
separatorPath.closePath()
// UIColor.whiteColor().setFill()
UIColor.whiteColor().setStroke()
separatorPath.lineWidth = 1
separatorPath.stroke()

UIBezierPath 没有出现

UIBezierPath not appearing

core-graphics

ios

uibezierpath

swift