code.swift

import UIKit

class Second: UIViewController {
  @IBOutlet weak var trigger: RoundButton!
  @IBOutlet weak var right: RoundButton!
  @IBOutlet weak var left: RoundButton!
  @IBOutlet weak var top: RoundButton!
  var clicked = false
  
  var rightCenter: CGPoint!
  var leftCenter: CGPoint!
  var topCenter: CGPoint!
  
  override func viewDidLoad() {
    super.viewDidLoad()
    topCenter = top.center
    rightCenter = right.center
    leftCenter = left.center
  }
  
  func buttonToInitPosition() {
    top.center = trigger.center
    left.center = trigger.center
    right.center = trigger.center
  }
  
  func buttonToDestPosition() {
    top.center = topCenter
    left.center = leftCenter
    right.center = rightCenter
    
    top.alpha = 1
    left.alpha = 1
    right.alpha = 1
  }
  

  @IBAction func triggerClicked(_ sender: RoundButton) {
    if clicked{
      buttonToDestPosition()
      clicked = false
    }else{
      buttonToInitPosition()
      clicked = true
    }
  }
  
  
}