Trying to add dashed border separator in tableview - ios

Question

Using this example I am trying to add a dashed border to my UITableView.
Trying to draw dashed border for UITableViewCell
But it does not work. It shows nothing.
func addDashedBottomBorder(to cell: UITableViewCell) {
let color = UIColor.black.cgColor
let shapeLayer:CAShapeLayer = CAShapeLayer()
let frameSize = cell.frame.size
let shapeRect = CGRect(x: 0, y: 0, width: frameSize.width, height: 0)
shapeLayer.bounds = shapeRect
shapeLayer.position = CGPoint(x: frameSize.width/2, y: frameSize.height)
shapeLayer.fillColor = UIColor.clear.cgColor
shapeLayer.strokeColor = color
shapeLayer.lineWidth = 2.0
shapeLayer.lineJoin = kCALineJoinRound
shapeLayer.lineDashPattern = [9,6]
shapeLayer.path = UIBezierPath(roundedRect: CGRect(x: 0, y: shapeRect.height, width: shapeRect.width, height: 0), cornerRadius: 0).cgPath
cell.layer.addSublayer(shapeLayer)
}
I am using this method in cellForRowAt but it shows me nothing and in viewDidLoad, table.separatorStyle = .none.

Answer 1

From the below 2 lines of your code:
shapeLayer.lineJoin = kCALineJoinRound
shapeLayer.path = UIBezierPath(roundedRect: CGRect(x: 0, y: shapeRect.height, width: shapeRect.width, height: 0), cornerRadius: 0).cgPath
kCALineJoinRound is making upper and lower dash lines but they are overlapping due to the height of UIBezierPath is 0. So, Updated your code as:
shapeLayer.path = UIBezierPath(roundedRect: CGRect(x: 0, y: shapeRect.height, width: shapeRect.width, height: 1), cornerRadius: 0).cgPath
It will hide the lower line and you will get the desired result.
Best Solution:
Rather than hiding lower dash line, you can correct it by providing just lineDashPhase to your CAShapeLayer, as:
shapeLayer.lineJoin = kCALineJoinRound
shapeLayer.lineDashPhase = 3.0 // Add "lineDashPhase" property to CAShapeLayer
shapeLayer.lineDashPattern = [9,6]
shapeLayer.path = UIBezierPath(roundedRect: CGRect(x: 0, y: shapeRect.height, width: shapeRect.width, height: 0), cornerRadius: 0).cgPath
Received line is: