swift - UIBezierPath: How to add a border around a view with rounded corners?

Question

I am using UIBezierPath to have my imageview have round corners but I also want to add a border to the imageview. Keep in mind the top is a uiimage and the bottom is a label.

Currently using this code produces:

let rectShape = CAShapeLayer()
rectShape.bounds = myCell2.NewFeedImageView.frame
rectShape.position = myCell2.NewFeedImageView.center
rectShape.path = UIBezierPath(roundedRect: myCell2.NewFeedImageView.bounds,
    byRoundingCorners: .TopRight | .TopLeft,
    cornerRadii: CGSize(width: 25, height: 25)).CGPath
myCell2.NewFeedImageView.layer.mask = rectShape

I want to add a green border to that but I cant use

myCell2.NewFeedImageView.layer.borderWidth = 8
myCell2.NewFeedImageView.layer.borderColor = UIColor.greenColor().CGColor

because it cuts off the top left and top right corner of the border as seen in this image:

Is there a way too add in a border with UIBezierPath along with my current code?

Answer 1

You can reuse the UIBezierPath path and add a shape layer to the view. Here is an example inside a view controller.

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        // Create a view with red background for demonstration
        let v = UIView(frame: CGRectMake(0, 0, 100, 100))
        v.center = view.center
        v.backgroundColor = UIColor.redColor()
        view.addSubview(v)

        // Add rounded corners
        let maskLayer = CAShapeLayer()
        maskLayer.frame = v.bounds
        maskLayer.path = UIBezierPath(roundedRect: v.bounds, byRoundingCorners: .TopRight | .TopLeft, cornerRadii: CGSize(width: 25, height: 25)).CGPath
        v.layer.mask = maskLayer

        // Add border
        let borderLayer = CAShapeLayer()
        borderLayer.path = maskLayer.path // Reuse the Bezier path
        borderLayer.fillColor = UIColor.clearColor().CGColor
        borderLayer.strokeColor = UIColor.greenColor().CGColor
        borderLayer.lineWidth = 5
        borderLayer.frame = v.bounds
        v.layer.addSublayer(borderLayer)   
    }

}

The end result looks like this.

Note that this only works as expected when the view's size is fixed. When the view can resize, you will need to create a custom view class and resize the layers in layoutSubviews.