update

appbuilder-ios/AppBuilder/AppBuilder/ViewController.swift

@@ -465,7 +465,10 @@ class ViewController: UITabBarController, UITabBarControllerDelegate, SettingMAB
     
     func showWelocomeView() {
         if let viewWelcome = welcomeVC.view {
-            viewWelcome.backgroundColor = .white
+            let bgImage = UIImageView()
+            viewWelcome.addSubview(bgImage)
+            bgImage.anchor(top: viewWelcome.topAnchor, left: viewWelcome.leftAnchor, bottom: viewWelcome.bottomAnchor, right: viewWelcome.rightAnchor)
+            bgImage.backgroundColor = .white
             DispatchQueue.global().async {
                 if let listBg = PrefsUtil.getBackground() {
                     if listBg.isEmpty {
@@ -478,7 +481,7 @@ class ViewController: UITabBarController, UITabBarControllerDelegate, SettingMAB
                         guard let data = data, error == nil else { return }
                         // always update the UI from the main thread
                         DispatchQueue.main.async() {
-                            viewWelcome.backgroundColor = UIColor(patternImage: UIImage(data: data)!)
+                            bgImage.image = UIImage(data: data)!
                         }
                     }
                 }