timqzm

import UIKit
import PlaygroundSupport

let containerView = UIView(frame: CGRect(x: 0.0, y: 0.0, width: 375.0, height: 667.0))
PlaygroundPage.current.liveView = containerView

let circle = UIView(frame: CGRect(x: 0.0, y: 0.0, width: 50.0, height: 50.0))
circle.center = containerView.center
circle.layer.cornerRadius = 25.0

timqzm

var activeTextField: UITextField?

@IBAction func logIn(_ sender: Any) {
    // ...
    HUD.flash(.labeledError(title: "blabla", subtitle: "blablalba"), 
              onView: activeTextField?.inputAccessoryView, 
              delay: 1.0)
    // ...
}