UIActivityIndi cator添加AppDelegate

Question

我想在打开应用程序时运行UIActivityIndicator。我怎样才能做到这一点？我的代码是我在那里分享它的方式。我想要在Launchscreen打开时使用此代码。

 @objc func buttonTapped(_ sender: UIButton) {
        let size = CGSize(width: 30, height: 30)
        let selectedIndicatorIndex = sender.tag
        let indicatorType = presentingIndicatorTypes[selectedIndicatorIndex]

        startAnimating(size, message: "Loading...", type: indicatorType, fadeInAnimation: nil)

        DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 1.5) {
            NVActivityIndicatorPresenter.sharedInstance.setMessage("Authenticating...")
        }

        DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 3) {
            self.stopAnimating(nil)
        }
    }
 for (index, indicatorType) in presentingIndicatorTypes.enumerated() {
            let x = 150
            let y = 250
            let frame = CGRect(x: x, y: y, width: 100, height: 100)
            let activityIndicatorView = NVActivityIndicatorView(frame: frame,
                                                                type: .orbit)
            let animationTypeLabel = UILabel(frame: frame)
            activityIndicatorView.padding = 20
            if indicatorType == NVActivityIndicatorType.orbit {
                activityIndicatorView.padding = 0
            }
            self.view.addSubview(activityIndicatorView)
            self.view.addSubview(animationTypeLabel)
            activityIndicatorView.startAnimating()

            let button: UIButton = UIButton(frame: frame)
            button.tag = index
            #if swift(>=4.2)
            button.addTarget(self,
                             action: #selector(buttonTapped(_:)),
                             for: .touchUpInside)
            #else
            button.addTarget(self,
                             action: #selector(buttonTapped(_:)),
                             for: UIControlEvents.touchUpInside)
            #endif
            self.view.addSubview(button)
        }