iPhone 应用程序图标 - 精确的半径

iPhone 应用程序图标 - 精确的半径？

swift
import UIKit
class IconViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let iconSize = CGSize(width: 120, height: 120)
        let iconRadius = iconSize.width / 2
        
        let iconView = UIView(frame: CGRect(origin: .zero, size: iconSize))
        iconView.backgroundColor = .blue
        iconView.layer.cornerRadius = iconRadius
        
        view.addSubview(iconView)
    }
}