如何在UISearchController中自定义searchBar？

Question

I know how to set the appearance for a independent UISearchBar , just like the following.

    let searchField = searchBar.value(forKey: "searchField") as? UITextField

    if let field = searchField {
        field.backgroundColor = UIColor.defaultBackgroundColor
        field.layer.cornerRadius = 15.0
        field.textColor = .white
        field.tintColor = .white

        field.font = UIFont.systemFont(ofSize: fl(13))
        field.layer.masksToBounds = true
        field.returnKeyType = .search
    }

But this is not working in the UISearchController .

I want to set the text color of the placeholder and the left magnifying lens icon to pure white. (It seems there is a colored layer over them now).

In addition, the input text is black now, I want it to be white too.

In a conclusion, I want to modify the following properties.
1. textField background color
2. textFiled placeholder text color
3. textFiled text color
4. textFiled font

Anyone know how do it?

Add the following with your code in viewDidAppear:

            let placeholderString = NSAttributedString(string: "Placeholder", attributes: [NSAttributedStringKey.foregroundColor: UIColor.white])
            field.attributedPlaceholder = placeholderString

            let iconView = field.leftView as! UIImageView
            iconView.image = iconView.image?.withRenderingMode(.alwaysTemplate)
            iconView.tintColor = .white

Updata:
Put those settings in ViewDidAppear() did solve a part of my problem.
But the textfield's background color changed when I set the bar's background color.
Because searchBar.barTintColor = .red is not working in iOS11's UISearchController embedded in navigation item, I used searchBar.backgroundColor = .red
It confused me a lot.
So how to change searchBar's background and textField's background separately?

Answer 1

set attributedPlaceholder for textfield of search bar

@IBOutlet weak var sbSearchBar: UISearchBar!
if let textfield = sbSearchBar.value(forKey: "searchField") as? UITextField {

    textfield.backgroundColor = UIColor.red
    textfield.attributedPlaceholder = NSAttributedString(string: textfield.placeholder ?? "", attributes: [NSAttributedStringKey.foregroundColor : UIColor.white])

    if let leftView = textfield.leftView as? UIImageView {
        leftView.image = leftView.image?.withRenderingMode(.alwaysTemplate)
        leftView.tintColor = UIColor.white
    }

}

Here is result:

Update:

I think, this may help you: how to change uitextfield color in searchcontroller?

Just apply your color combination in this code and see.

if #available(iOS 11.0, *) {
            let sc = UISearchController(searchResultsController: nil)
            sc.delegate = self
            let scb = sc.searchBar
            scb.tintColor = UIColor.white
            scb.barTintColor = UIColor.white


            if let textfield = scb.value(forKey: "searchField") as? UITextField {
                //textfield.textColor = // Set text color
                if let backgroundview = textfield.subviews.first {

                    // Background color
                    backgroundview.backgroundColor = UIColor.white

                    // Rounded corner
                    backgroundview.layer.cornerRadius = 10;
                    backgroundview.clipsToBounds = true;

                }
            }

            if let navigationbar = self.navigationController?.navigationBar {
                navigationbar.barTintColor = UIColor.blue
            }
            navigationItem.searchController = sc
            navigationItem.hidesSearchBarWhenScrolling = false

}

Result:

Answer 2

Add the following with your code in viewDidAppear:

            let placeholderString = NSAttributedString(string: "Placeholder", attributes: [NSAttributedStringKey.foregroundColor: UIColor.white])
            field.attributedPlaceholder = placeholderString

            let iconView = field.leftView as! UIImageView
            iconView.image = iconView.image?.withRenderingMode(.alwaysTemplate)
            iconView.tintColor = .white

Update - the following is the complete code to customize UISearchController colors:

override func viewDidAppear(_ animated: Bool) {

    //sets navigationbar backgroundColor
    if let navigationbar = self.navigationController?.navigationBar {
        navigationbar.barTintColor = UIColor.magenta
    }

    let searchField = searchController.searchBar.value(forKey: "searchField") as? UITextField

    //sets searchBar backgroundColor
    searchController.searchBar.backgroundColor = .blue

    if let field = searchField {
        field.layer.cornerRadius = 15.0
        //sets text Color
        field.textColor = .brown

        //sets indicator and cancel button Color
        field.tintColor = .green

        field.font = UIFont.systemFont(ofSize: 13)
        field.layer.masksToBounds = true
        field.returnKeyType = .search

        //sets placeholder text Color
        let placeholderString = NSAttributedString(string: "placeholder", attributes: [NSAttributedStringKey.foregroundColor: UIColor.red])
        field.attributedPlaceholder = placeholderString

        //sets icon Color
        let iconView = field.leftView as! UIImageView
        iconView.image = iconView.image?.withRenderingMode(.alwaysTemplate)
        iconView.tintColor = .cyan

        //sets textField backgroundColor
        if let backgroundview = field.subviews.first {
            backgroundview.backgroundColor = UIColor.yellow
        }
    }
}