How to adjust the size of UITextField.leftView? - swift

Question

I am trying to change adjust the size of the a UIImageView that is the leftView of my UITextField without any success. The image is always huge. I would like it to have the same height as my UITextField. Here is what i have tried:
Result:
let topContainer: UIView = {
let view = UIView()
view.layer.borderWidth = 1.0
view.layer.borderColor = UIColor.appGrayExtraLightGray.cgColor
view.layer.cornerRadius = 5
view.clipsToBounds = true
view.translatesAutoresizingMaskIntoConstraints = false
return view
}()
let emailField: UITextField = {
let view = UITextField()
view.backgroundColor = UIColor.orange
view.text = "myEmailAddress#gmail.com"
view.font = UIFont.systemFont(ofSize: 14)
view.translatesAutoresizingMaskIntoConstraints = false
return view
}()
let s = view.safeAreaLayoutGuide
topContainer.addSubview(emailField)
emailField.topAnchor.constraint(equalTo: topContainer.topAnchor, constant: spacing).isActive = true
emailField.leadingAnchor.constraint(equalTo: topContainer.leadingAnchor, constant: spacing).isActive = true
emailField.trailingAnchor.constraint(equalTo: topContainer.trailingAnchor, constant: -spacing).isActive = true
emailField.bottomAnchor.constraint(equalTo: topContainer.bottomAnchor, constant: -spacing).isActive = true
/**Mail and clear button on eitherisde of textField*/
let mailView = UIImageView.init(frame: CGRect.init(x: 0, y: 0, width: 15, height: 15)) // Chaning the GREct has no effect on the size!!
mailView.image = UIImage.init(named: "mailGrayFilled")
emailField.leftView = mailView
emailField.leftViewMode = .always
emailField.clearButtonMode = .always
view.addSubview(topContainer)
topContainer.topAnchor.constraint(equalTo: s.topAnchor, constant: spacing).isActive = true
topContainer.leadingAnchor.constraint(equalTo: s.leadingAnchor, constant: spacing).isActive = true
topContainer.trailingAnchor.constraint(equalTo: s.trailingAnchor, constant: -spacing).isActive = true

Answer 1

Putting the UIImageView into a Container UIView seems to fix the issue when I test your code. This may also allow you to adjust the padding to suit your needs.
let iconContainer = UIView(frame: CGRect(x: 0, y: 0, width: 25, height: 15))
let mailView = UIImageView(frame: CGRect(x: 0, y: 0, width: 15, height: 15))
mailView.image = UIImage(named: "mailGrayFilled")
mailView.contentMode = .scaleAspectFit
iconContainer.addSubview(mailView)
emailField.leftViewMode = .always
emailField.leftView = iconContainer
emailField.clearButtonMode = .always