import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var label: UILabel!

    override func viewDidLoad() {
        super.viewDidLoad()

        let env = ProcessInfo.processInfo.environment
        // "KEY"の箇所は任意で設定したName
        if let value = env["KEY"] {
            self.label.text = value
        }

        // 背景色を黄色
        self.view.backgroundColor = .yellow

    }

}