override func viewDidLoad() {
super.viewDidLoad()
let TAG_BTN = 1001 // it is assigned to button which you want to change properties.
let btn : UIButton = self.view.viewWithTag(TAG_BTN) as! UIButton
btn.layer.cornerRadius = 5
btn.layer.borderColor = UIColor.grayColor().CGColor
btn.layer.borderWidth = 1.5
btn.backgroundColor = UIColor(red: 1.0, green: 0, blue: 0, alpha: 1)
}