How to add a 1 pixel gray border around a UISearchBar TextField

Question

I\'m trying to figure out how to add a 1 pixel stroke gray border to my UISearchBar in my app. The Facebook Messenger app accomplishes this quite well. (see pic below).

Answer 1

I upvoted Yaroslav's answer but it's broken as of iOS 13. Here is what works today:

    func changeSearchBarAppearance() {
        var searchTextField : UITextField?
        if #available(iOS 13, *) {
            // brand new searchTextField is available as of iOS 13
            searchTextField = searchBar.searchTextField
        } else {
            // Yaroslav's answer still works in iOS versions less than 13
            // here's a slightly different implementation:
            if let matchingTextField = searchBar.subviews[0].subviews.compactMap ({ $0 as? UITextField }).first {
                searchTextField = matchingTextField
            }
        }

        guard let validTextField = searchTextField else {
            return
        }

        validTextField.layer.cornerRadius = 16
        validTextField.layer.borderWidth = 1.0
        validTextField.layer.borderColor = UIColor.grey.cgColor
        validTextField.backgroundColor = .white
        validTextField.placeholder = "insert-some-placeholder-text"
    }