如何在UIlabel中显示阿拉伯语文本

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        let arabicText = "مرحبا بالعالم"

        let label = UILabel(frame: CGRect(x: 50, y: 100, width: 200, height: 50))
        label.text = arabicText
        label.textAlignment = .right
        label.semanticContentAttribute = .forceRightToLeft
        label.font = UIFont(name: "Helvetica Neue", size: 20)

        self.view.addSubview(label)
    }
}