How to apply a tintColor to a UIImage?

On iOS 13+ you can use the following:

UIImage(named: "img_name")?.withTintColor(.red)

https://developer.apple.com/documentation/uikit/uiimage/3327300-withtintcolor

Swift 4, copy-paste solution

@IBOutlet weak var iconImageView: UIImageView!
iconImageView.image = UIImage(imageLiteralResourceName: "myImageName").withRenderingMode(.alwaysTemplate)
iconImageView.tintColor = UIColor.red

Try this:

func tinted(with color: UIColor) -> UIImage? {
    defer { UIGraphicsEndImageContext() }
    UIGraphicsBeginImageContextWithOptions(self.size, false, self.scale)
    color.set()
    self.withRenderingMode(.alwaysTemplate).draw(in: CGRect(origin: .zero, size: self.size))
    return UIGraphicsGetImageFromCurrentImageContext()
}

For example:

button.setImage(UIImage(systemName: "checkmark.circle")?.tinted(with: .systemGray), for: .normal)

If you are just supporting iOS 7 you can use tintColor and UIImageRenderingModeAlwaysTemplate

This article covers that:

https://www.captechconsulting.com/blogs/ios-7-tutorial-series-tint-color-and-easy-app-theming

If you need to support an earlier version you may want to consider this thread

How would I tint an image programmatically on the iPhone?