change color searchBar result icon swift

问题:

how can I change color of result icon by code in swift?

回答1:

It seems that the currentImage is nil for clearButton in Swift 4.2 and 4.1.x. It might have been working in the older versions as in many other answers its working for them.

So i created this class with common customizations shown under Usage.

class SearchBar: UISearchBar {

    private enum SubviewKey: String {
        case searchField, clearButton, cancelButton,  placeholderLabel
    }

    // Button/Icon images
    public var clearButtonImage: UIImage?
    public var resultsButtonImage: UIImage?
    public var searchImage: UIImage?

    // Button/Icon colors
    public var searchIconColor: UIColor?
    public var clearButtonColor: UIColor?
    public var cancelButtonColor: UIColor?
    public var capabilityButtonColor: UIColor?

    // Text
    public var textColor: UIColor?
    public var placeholderColor: UIColor?
    public var cancelTitle: String?

    // Cancel button to change the appearance.
    public var cancelButton: UIButton? {
        guard showsCancelButton else { return nil }
        return self.value(forKey: SubviewKey.cancelButton.rawValue) as? UIButton
    }

    override func layoutSubviews() {
        super.layoutSubviews()

        if let cancelColor = cancelButtonColor {
            self.cancelButton?.setTitleColor(cancelColor, for: .normal)
        }
        if let cancelTitle = cancelTitle {
            self.cancelButton?.setTitle(cancelTitle, for: .normal)
        }

        guard let textField = self.value(forKey: SubviewKey.searchField.rawValue) as? UITextField else { return }

        if let clearButton = textField.value(forKey: SubviewKey.clearButton.rawValue) as? UIButton {
            update(button: clearButton, image: clearButtonImage, color: clearButtonColor)
        }
        if let resultsButton = textField.rightView as? UIButton {
            update(button: resultsButton, image: resultsButtonImage, color: capabilityButtonColor)
        }
        if let searchView = textField.leftView as? UIImageView {
            searchView.image = (searchImage ?? searchView.image)?.withRenderingMode(.alwaysTemplate)
            if let color = searchIconColor {
                searchView.tintColor = color
            }
        }
        if let placeholderLabel =  textField.value(forKey: SubviewKey.placeholderLabel.rawValue) as? UILabel,
            let color = placeholderColor {
            placeholderLabel.textColor = color
        }
        if let textColor = textColor  {
            textField.textColor = textColor
        }
    }

    private func update(button: UIButton, image: UIImage?, color: UIColor?) {
        let image = (image ?? button.currentImage)?.withRenderingMode(.alwaysTemplate)
        button.setImage(image, for: .normal)
        button.setImage(image, for: .highlighted)
        if let color = color {
            button.tintColor = color
        }
    }
}

Usage:

class ViewController: UIViewController {

    @IBOutlet private weak var searchBar: SearchBar!

    override func viewDidLoad() {
        super.viewDidLoad()

        searchBar.clearButtonColor      = .purple
        searchBar.cancelButtonColor     = .magenta
        searchBar.searchIconColor       = .red
        searchBar.placeholderColor      = .green
        searchBar.textColor             = .orange
        searchBar.capabilityButtonColor = .green
    }
}

Output:

回答2:

let sb = UISearchBar()

    sb.searchBarStyle = UISearchBarStyle.minimal
    sb.showsSearchResultsButton = true
   // sb.setClearButtonColorTo(color: UIColor.white)

    let textFieldInsideSearchBar = sb.value(forKey: "searchField") as? UITextField
    let crossIconView = textFieldInsideSearchBar?.value(forKey: "clearButton") as? UIButton
    crossIconView?.setImage(crossIconView?.currentImage?.withRenderingMode(.alwaysTemplate), for: .normal)
    crossIconView?.tintColor = .white