如何让.adjustsFontSizeToFitWidth正常运行

Question

使用这个简单的代码,我假设"Hello World!"自动收缩会起作用,bannerLabel.adjustsFontSizeToFitWidth但文本的末尾会被剪切,...如何让它正常工作？

import UIKit

class ViewController: UIViewController, UIGestureRecognizerDelegate {

    @IBOutlet weak var bannerLabel: UILabel!

    override func viewDidLoad() {
        super.viewDidLoad()

        bannerLabel.adjustsFontSizeToFitWidth = true
        bannerLabel.numberOfLines = 1
        bannerLabel.text = "Hello World!"
        bannerLabel.font = UIFont(name: bannerLabel.font.fontName, size: 150)!

    }

Answer 1

titleLabel?.numberOfLines = 1 

titleLabel?.adjustsFontSizeToFitWidth = true

titleLabel?minimumScaleFactor = 0.1