在UITableViewCell上单击UIImageView模板图像色调变化

Question

I'm trying to add template images to the slide menu controller (based on this SideMenuController component ). But I have an issue with tint color. Original images are dark grey, and I want them to be white. I've set .alwaysTemplate mode and tint colors programmatically, but instead of required behaviour I am getting this:

Ie, tint color changes from grey to white only when I am tapping that menu item. Do you know how to fix that?

Here is a code I have for navigation menu controller:

class NavigationMenuController: UITableViewController {

    @IBOutlet weak var groupsIcon: UIImageView!
    @IBOutlet weak var calendarIcon: UIImageView!
    @IBOutlet weak var documentsIcon: UIImageView!
    @IBOutlet weak var settingsIcon: UIImageView!

    private let gradientTop = UIColor.fromHexadecimal(0xF3736F)
    private let gradientBottom = UIColor.fromHexadecimal(0xEC92AE)
    private let cellSelection = UIColor.fromHexadecimal(0xEC92AE)
    private let menuIconTint = UIColor.fromHexadecimal(0xFFFFFF)

    private let segues = [
        "embedGroupsController",
        "embedCalendarController",
        "embedRulesController",
        "embedSettingsController"
    ]

    override func viewDidLoad() {
        super.viewDidLoad()

        let gradient = CAGradientLayer()
        gradient.colors = [gradientTop.cgColor, gradientBottom.cgColor]
        gradient.locations = [0.0, 1.0]
        gradient.frame = tableView.bounds

        let backgroundView = UIView(frame: tableView.bounds)
        backgroundView.layer.insertSublayer(gradient, at: 0)
        tableView.backgroundView = backgroundView

        let imageViews: [UIImageView] = [groupsIcon, calendarIcon, documentsIcon, settingsIcon]
        for imageView in imageViews {
            guard let image = imageView.image else { fatalError("Image not found") }
            let templateImage = image.withRenderingMode(.alwaysTemplate)
            imageView.image = templateImage
            imageView.tintColor = menuIconTint
        }
    }

    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = super.tableView(tableView, cellForRowAt: indexPath)
        let bgColorView = UIView()
        bgColorView.backgroundColor = cellSelection
        cell.selectionStyle = .default
        cell.backgroundColor = .clear
        cell.selectedBackgroundView = bgColorView
        return cell
    }

    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        guard let sideMenu = sideMenuController else {
            fatalError("Side menu controller is not configured")
        }
        if indexPath.row >= segues.count {
            fatalError("Unexpected row index: \(indexPath.row)")
        }
        sideMenu.performSegue(withIdentifier: segues[indexPath.row], sender: nil)
    }

}

I also tried to do it via Storyboard and Assets settings, but having same effect. I am running this app on iOS 10 and Swift 3.

Answer 1

I had the same issues with a UIImageView tint inside a cell.

I fixed it by setting the image view tint to Default and setting the cell's content view tint instead.

Answer 2

Ok, yes, @Aakash and @HiteshAgarwal are right, here is a solution to my problem. I set tint color in cellForRowAt delegate method and it changed to required color (though I still do not know why Storyboard approach failed and why manual color setting is required):

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = super.tableView(tableView, cellForRowAt: indexPath)
    let bgColorView = UIView()

    bgColorView.backgroundColor = cellSelection
    cell.selectionStyle = .default
    cell.backgroundColor = .clear
    cell.selectedBackgroundView = bgColorView

    if let imageView = getCellImageView(cell) {
        imageView.tintColor = UIColor.white
    }

    return cell
}