实现场景切换

start.py

@@ -31,6 +31,10 @@ class Game:
                     self.running = False
                 self.scene.handle_event(event)  # 当前场景接收事件
 
+            # 检查是否切换场景
+            if self.scene.next_scene is not None:
+                self.scene = self.scene.next_scene
+
             # 清屏
             self.screen.fill(GameConfig.bg_color)