iPhone 网络应用程序启动屏幕

iPhone 网络应用程序启动屏幕是指在用户打开应用程序时，首先显示的启动画面。这个启动画面可以用来展示应用程序的品牌标志、宣传口号或其他重要信息，给用户留下深刻的第一印象。本文将介绍如何在iPhone网络应用程序中添加启动屏幕，并提供相关的案例代码。

swift
import UIKit
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
    var window: UIWindow?
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        window = UIWindow(frame: UIScreen.main.bounds)
        
        let launchScreenVC = UIStoryboard(name: "LaunchScreen", bundle: nil).instantiateInitialViewController()
        window?.rootViewController = launchScreenVC
        window?.makeKeyAndVisible()
        
        DispatchQueue.main.asyncAfter(deadline: .now() + 3) {
            let mainVC = UIStoryboard(name: "Main", bundle: nil).instantiateInitialViewController()
            self.window?.rootViewController = mainVC
        }
        
        return true
    }
    // other methods...
}