Border Padding for a UIView - ios

Question

I created a standard border around my UIView like so:
vwGroup.layer.borderColor = UIColor.yellow.cgColor
vwGroup.layer.borderWidth = 2.0;
but I would like to have 5px of padding/margin/spacing between the UIView, and the border that surrounds it.
Right now it just draws the border immediately around it. I'd like to push it out so there is clear space between.
Any suggestions? I suspect insets are the way to go but can't figure it out.
Thank you!

Answer 1

Insets isn't the way to go. You use inset for padding a view's internal content from its margins. For what you need your best option is to wrap your vwGroup inside another UIView and set the border in the wrapping view. Something like:
let wrappingView = UIView(frame: someFrame)
wrappingView.backgroundColor = .clear
wrappingView.layer.borderColor = UIColor.yellow.cgColor
wrappingView.layer.borderWidth = 2.0;
wrappingView.addSubview(vwGroup)
Of course this is just for you to get the big picture. You might want to set proper frames/constraints.

Answer 2

Try this, it is helpful for you.
First, Add this extension
extension CALayer {
func addGradientBorder(colors:[UIColor],width:CGFloat = 1) {
let gradientLayer = CAGradientLayer()
gradientLayer.frame = CGRect(origin: CGPoint.zero, size: self.bounds.size)
gradientLayer.startPoint = CGPoint(x:0.0, y:0.0)
gradientLayer.endPoint = CGPoint(x:1.0,y:1.0)
gradientLayer.colors = colors.map({$0.cgColor})
let shapeLayer = CAShapeLayer()
shapeLayer.lineWidth = width
shapeLayer.path = UIBezierPath(rect: self.bounds).cgPath
shapeLayer.fillColor = nil
shapeLayer.strokeColor = UIColor.red.cgColor
gradientLayer.mask = shapeLayer
self.addSublayer(gradientLayer)
}
}
Then add the UIView with border
let vwGroup = UIView(frame: CGRect(x: 50, y: 150, width: 200, height: 200))
vwGroup.backgroundColor = .red
//-- This is for padding between boarder and view -- you can set padding color ---
vwGroup.layer.addGradientBorder(colors:[UIColor.black,UIColor.black] , width: 40)
//-- This is for outer boarder -- you can also change the color of outer boarder --
vwGroup.layer.addGradientBorder(colors:[UIColor.white,UIColor.white] , width: 10)
self.view.addSubview(vwGroup)
Output is:

Answer 3

swift 5.4
call like this:
customView.layer.innerBorder()
did it, by add a sublayer
extension CALayer {
func innerBorder(borderOffset: CGFloat = 24.0, borderColor: UIColor = UIColor.blue, borderWidth: CGFloat = 2) {
let innerBorder = CALayer()
innerBorder.frame = CGRect(x: borderOffset, y: borderOffset, width: frame.size.width - 2 * borderOffset, height: frame.size.height - 2 * borderOffset)
innerBorder.borderColor = borderColor.cgColor
innerBorder.borderWidth = borderWidth
innerBorder.name = "innerBorder"
insertSublayer(innerBorder, at: 0)
}
}