gistfile1.txt

import UIKit

class ViewController: UIViewController {

  @IBOutlet weak var buttonWithBorderLeft: UIButton!
  
  override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    
    // FYI: In storyboard, I explicetly set the height to 30 points
    buttonWithBorderLeft.setTitle("Meow", forState: .Normal)
    
    let path = UIBezierPath()
    path.moveToPoint(CGPoint(x: 0, y: 0))
    path.addLineToPoint(CGPoint(x: 0, y: 30))
    
    let shapeLayer = CAShapeLayer()
    shapeLayer.path = path.CGPath
    shapeLayer.lineWidth = 3.0
    shapeLayer.strokeColor = UIColor.grayColor().CGColor
    shapeLayer.fillColor = UIColor.grayColor().CGColor
    buttonWithBorderLeft.layer.addSublayer(shapeLayer)
  }
}