I've been googling without great success so far.
I would like to draw a 6px thick red arc (not wedge), 0º at the top of the
screen, and from say 60° - 110º. Assume I have to create a UIBezierPath,
and then create a CAShapeLayer with that bezier path? Then add the shape
layer to a UIView that I have.
I'll be given the 2 angles to use via sliders - so I can update the arc
(later). I just want to nail down an initial arc. Below doesn't work.
1. How do I get things so 0º is at the top, rotate circle 90º
counterclockwise?
2. How can I get the red arc?
Thanks!
// Circle is a UIView with a height and width of 300
let centre = CGPoint (x: circle.frame.size.width / 2, y: circle.frame.size.
height / 2)
let startAngle: CGFloat = 70.0
let endAngle: CGFloat = 100
let a_path = UIBezierPath()
a_path.move(to: CGPoint(x: circle.frame.width / 2, y: circle.frame.height
/ 2))
a_path.addArc(withCenter: centre, radius: 150, startAngle: CGFloat
(startAngle).toRadians(), endAngle: CGFloat(endAngle).toRadians(),
clockwise: true)
// Want a red stroke on the arc, I get filled black wedge instead
let redColor = UIColor.red
redColor.setStroke()
a_path.lineWidth = 6
a_path.lineCapStyle = .round
a_path.stroke()
let a_shapeLayer = CAShapeLayer()
a_shapeLayer.path = a_path.cgPath
circle.layer.sublayers?.forEach { $0.removeFromSuperlayer() }
circle.layer.addSublayer(a_shapeLayer)
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