Make emoji symbols grayscale in UILabel

问题:

I would like to use Apple's built-in emoji characters (specifically, several of the smileys, e.g. \ue415) in a UILabel but I would like the emojis to be rendered in grayscale.

I want them to remain characters in the UILabel (either plain text or attributed is fine). I'm not looking for a hybrid image / string solution (which I already have).

Does anyone know how to accomplish this?

回答1:

I know you said you aren't looking for a "hybrid image solution", but I have been chasing this dragon for a while and the best result I could come up with IS a hybrid. Just in case my solution is somehow more helpful on your journey, I am including it here. Good luck!

import UIKit
import QuartzCore

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        // the target label to apply the effect to
        let label = UILabel(frame: view.frame)
        // create label text with empji
        label.text = "