UISearchController iOS 11 Customization

问题

I had been using the following code prior iOS 11 to customize the appearance of the UISearchController search bar:

var searchController = UISearchController(searchResultsController: nil)
searchController.searchBar.setDefaultSearchBar()
searchController.searchResultsUpdater = self

if #available(iOS 11.0, *) {
    navigationItem.searchController = searchController
} else {
    tableView.tableHeaderView = searchController.searchBar
}

extension UISearchBar {
    func setDefaultSearchBar() {
        self.tintColor = UIColor.blue
        self.searchBarStyle = .minimal
        self.backgroundImage = UIImage(color: UIColor.clear)
        let searchBarTextField = self.value(forKey: "searchField") as! UITextField
        searchBarTextField.textColor = UIColor.white
        searchBarTextField.tintColor = UIColor.blue
        searchBarTextField = .dark
    }
}

However, having updated to iOS 11 and adding the UISearchController as part of the navigationItemany customization (except the keyboard appearance proving my code has been called) fails to show. Is this a bug or have I implemented it incorrectly?

EDIT: Attached are two screenshots of devices running iOS 10 (first) and iOS 11

EDIT 2: Much of the attention on this question so far focuses on the text color of the UISearchBar. I am looking at more than this - the background color, tint color, the search indicator and clear button colors, etc. all are not able to be customized on a device running iOS 11 despite being perfectly able to do so at iOS 10.

回答1:

I just found out how to set them: (with some help of Brandon and Krunal, thanks!)

The "Cancel" text:

searchController.searchBar.tintColor = .white

The search icon:

searchController.searchBar.setImage(UIImage(named: "my_search_icon"), for: UISearchBarIcon.search, state: .normal)

The clear icon:

searchController.searchBar.setImage(UIImage(named: "my_search_icon"), for: UISearchBarIcon.clear, state: .normal)

The search text:

UITextField.appearance(whenContainedInInstancesOf: [UISearchBar.self]).defaultTextAttributes = [NSAttributedStringKey.foregroundColor.rawValue: UIColor.white]

The placeholder:

UITextField.appearance(whenContainedInInstancesOf: [UISearchBar.self]).attributedPlaceholder = NSAttributedString(string: "placeholder", attributes: [NSAttributedStringKey.foregroundColor: UIColor.white])

The white background:

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 = UIColor.blue
        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
}

Taken from here.

回答2:

To properly set the text typed into the search bar to white use (when using a dark field color):

searchController.searchBar.barStyle = .black

To set the textfield background color

if #available(iOS 11.0, *) {

        if let textfield = searchController.searchBar.value(forKey: "searchField") as? UITextField {
            if let backgroundview = textfield.subviews.first {

                // Background color
                backgroundview.backgroundColor = UIColor.white

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

However using something like

textfield.textColor = UIColor.blue

in the above does not seem to work.

回答3:

Try setting the search bar's bar style.

searchController.searchBar.barStyle = UIBarStyleBlack;

回答4:

You need to find the UISearchBar's underlying UITextField and change its text color.

Notice this only have effect when search controller is going to present (UISearchControllerDelegate.willPresentSearchController) or presented.

class ViewController : UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        // setup your search controller...

        // set search controller's delegate
        navigationItem.searchController?.delegate = self
    }
}

extension ViewController : UISearchControllerDelegate {

    func willPresentSearchController(_ searchController: UISearchController) {
        // update text color
        searchController.searchBar.textField?.textColor = .white
    }
}

extension UISearchBar {

    var textField: UITextField? {
        for subview in subviews.first?.subviews ?? [] {
            if let textField = subview as? UITextField {
                return textField
            }
        }
        return nil
    }
}

回答5:

Moving the call to setDefaultSearchBar into viewDidAppear should fix this.

回答6:

    UITextField.appearance(whenContainedInInstancesOf: [UISearchBar.self]).defaultTextAttributes = [NSForegroundColorAttributeName: UIColor.white]

回答7:

Try it: searchController.<YOUR SEARCHBAR>.barStyle = .blackOpaque instead of self.searchBarStyle = .minimal.

Thus:

var searchController = UISearchController(searchResultsController: nil)
searchController.searchBar.setDefaultSearchBar()
//Add this line below
searchController.searchBar.barStyle = .blackOpaque
searchController.searchResultsUpdater = self

if #available(iOS 11.0, *) {
    navigationItem.searchController = searchController
} else {
    tableView.tableHeaderView = searchController.searchBar
}

extension UISearchBar {
    func setDefaultSearchBar() {
        self.tintColor = UIColor.blue
        //Delete this line below
        self.searchBarStyle = .minimal
        self.backgroundImage = UIImage(color: UIColor.clear)
        let searchBarTextField = self.value(forKey: "searchField") as! UITextField
        searchBarTextField.textColor = UIColor.white
        searchBarTextField.tintColor = UIColor.blue
        searchBarTextField = .dark
    }
}

回答8:

If you need to change the background colour of the textField in the searchBar, see my answer here: https://stackoverflow.com/a/46315974/1109892

回答9:

You have to access the UITextField inside the UISearchBar. You can do that by using

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

textFieldInsideSearchBar?.textColor = yourcolor

来源：https://stackoverflow.com/questions/45663169/uisearchcontroller-ios-11-customization

标签

ios

swift

uisearchcontroller

ios11