Draw a circular segment progress in SWIFT

问题:

I would like to create a circular progress with slices where each slice is an arc.

I based my code on this answer: Draw segments from a circle or donut

But I don't know how to copy it and rotate it 10 times. And I would like to color it following a progress variable (in percent).

EDIT: I would like something like this

Any help please

Regards

回答1:

You could use a circular path and set the strokeStart and StrokeEnd. Something like this:

let circlePath = UIBezierPath(ovalInRect: CGRect(x: 200, y: 200, width: 150, height: 150))
var segments: [CAShapeLayer] = []
let segmentAngle: CGFloat = (360 * 0.125) / 360

for var i = 0; i < 8; i++ {
    let circleLayer = CAShapeLayer()
    circleLayer.path = circlePath.CGPath

    // start angle is number of segments * the segment angle
    circleLayer.strokeStart = segmentAngle * CGFloat(i)

    // end angle is the start plus one segment, minus a little to make a gap
    // you'll have to play with this value to get it to look right at the size you need
    let gapSize: CGFloat = 0.008
    circleLayer.strokeEnd = circleLayer.strokeStart + segmentAngle - gapSize

    circleLayer.lineWidth = 10
    circleLayer.strokeColor = UIColor(red:0,  green:0.004,  blue:0.549, alpha:1).CGColor
    circleLayer.fillColor = UIColor.clearColor().CGColor

    // add the segment to the segments array and to the view
    segments.insert(circleLayer, atIndex: i)
    view.layer.addSublayer(segments[i])
}