update : ios 启动屏

ios/Runner/AppDelegate.swift

@@ -1,6 +1,19 @@
 import Flutter
 import UIKit
 
+/// Keeps the system LaunchScreen as the only splash. Flutter would otherwise
+/// instantiate that storyboard again and the icon appears a second time.
+final class RunnerFlutterViewController: FlutterViewController {
+  override func loadDefaultSplashScreenView() -> Bool {
+    false
+  }
+
+  override func viewDidLoad() {
+    super.viewDidLoad()
+    view.backgroundColor = .black
+  }
+}
+
 @main
 @objc class AppDelegate: FlutterAppDelegate, FlutterImplicitEngineDelegate {
   override func application(