Update app.py

app.py

@@ -376,23 +376,24 @@ with gr.Blocks(
     )
 
     # 下载元数据
-    download_meta_btn.click(
-        fn=None,
-        inputs=[hidden_meta_file],
-        outputs=None,
-        js="(f) => { const a = document.createElement('a'); a.href = f; a.download = f.split('/').pop(); document.body.appendChild(a); a.click(); document.body.removeChild(a); }"
+    generate_btn.click(
+        fn=generate_image,
+        inputs=[
+            prompt_input, negative_prompt_input, style_radio,
+            seed_input, width_input, height_input,
+            optional_lora_dropdown, lora_scale_slider,
+            steps_slider, cfg_slider
+        ],
+        outputs=[
+            image_output,
+            metadata_output,
+            hidden_img_file,      # 👈 更新隐藏文件组件（Gradio 自动处理下载）
+            hidden_meta_file,     # 👈
+        ]
     )
 
     # 设置文件下载（通过返回值触发）
-    generate_button.click(
-        fn=lambda img_bytes, meta_bytes, img_name, meta_name: (
-            gr.File(value=io.BytesIO(img_bytes), label=img_name, visible=True),
-            gr.File(value=io.BytesIO(meta_bytes), label=meta_name, visible=True)
-        ),
-        inputs=[hidden_img_file, hidden_meta_file, hidden_img_file, hidden_meta_file],
-        outputs=[hidden_img_file, hidden_meta_file]
-    )
-
+    
 # ======================
 # 启动
 # ======================