Here is an example round button:
Swift 3, 4, 5:
override func viewDidLoad() {
super.viewDidLoad()
let button = UIButton(type: .custom)
button.frame = CGRect(x: 160, y: 100, width: 50, height: 50)
button.layer.cornerRadius = 0.5 * button.bounds.size.width
button.clipsToBounds = true
button.setImage(UIImage(named:"thumbsUp.png"), for: .normal)
button.addTarget(self, action: #selector(thumbsUpButtonPressed), for: .touchUpInside)
view.addSubview(button)
}
@objc func thumbsUpButtonPressed() {
print("thumbs up button pressed")
}
Swift 2.x:
override func viewDidLoad() {
super.viewDidLoad()
let button = UIButton(type: .Custom)
button.frame = CGRect(x: 160, y: 100, width: 50, height: 50)
button.layer.cornerRadius = 0.5 * button.bounds.size.width
button.clipsToBounds = true
button.setImage(UIImage(named:"thumbsUp.png"), forState: .Normal)
button.addTarget(self, action: #selector(thumbsUpButtonPressed), forControlEvents: .TouchUpInside)
view.addSubview(button)
}
func thumbsUpButtonPressed() {
print("thumbs up button pressed")
}