From 432b94fcbe87330c6a61aeca85e6a1a3d351bfe4 Mon Sep 17 00:00:00 2001
From: Yun Chan <yunchan@twentyoz.kr>
Date: Sat, 15 Aug 2026 17:06:11 +0900
Subject: [PATCH] M3: QR scanner only on physical devices (simulator camera
 session hangs first frame on iOS)

---
 VideoDownloader.Mobile/Pages.cs | 51 ++++++++++++++++++++-------------
 1 file changed, 31 insertions(+), 20 deletions(-)

diff --git a/VideoDownloader.Mobile/Pages.cs b/VideoDownloader.Mobile/Pages.cs
index 03d968c..50f5ee0 100644
--- a/VideoDownloader.Mobile/Pages.cs
+++ b/VideoDownloader.Mobile/Pages.cs
@@ -9,35 +9,46 @@ public sealed class ConnectPage : ContentPage
     private readonly Entry _manual = new() { Placeholder = "PC 주소 (예: 192.168.0.223:52100)", Keyboard = Keyboard.Url };
     private readonly Entry _manualToken = new() { Placeholder = "토큰 (QR 못 쓸 때)", IsPassword = true };
     private readonly Label _status = new() { Text = "PC 앱에서 '기기 연결'을 누르고 QR 을 스캔하세요", HorizontalOptions = LayoutOptions.Center, Margin = new Thickness(0, 12) };
-    private readonly ZXing.Net.Maui.Controls.CameraBarcodeReaderView _scanner;
 
     public ConnectPage()
     {
         Title = "연결";
 
-        _scanner = new ZXing.Net.Maui.Controls.CameraBarcodeReaderView
+        // 시뮬레이터는 카메라 하드웨어가 없어 세션 시작이 첫 프레임을 막음(UIApplication hang) → 실기기에서만 스캐너
+        View scannerArea = new Label
         {
-            HorizontalOptions = LayoutOptions.Fill,
-            HeightRequest = 320,
-            Options = new ZXing.Net.Maui.BarcodeReaderOptions
-            {
-                Formats = ZXing.Net.Maui.BarcodeFormats.TwoDimensional,
-                AutoRotate = true,
-            },
+            Text = "📷 시뮬레이터 — 수동 입력을 이용하세요",
+            HorizontalOptions = LayoutOptions.Fill, VerticalOptions = LayoutOptions.Center,
+            HorizontalTextAlignment = TextAlignment.Center, HeightRequest = 120,
+            BackgroundColor = Colors.Black, TextColor = Colors.LightGray,
         };
-        _scanner.BarcodesDetected += (s, e) =>
+        if (DeviceInfo.Current.DeviceType == DeviceType.Physical)
         {
-            var text = e.Results?.FirstOrDefault()?.Value;
-            if (string.IsNullOrEmpty(text)) return;
-            MainThread.BeginInvokeOnMainThread(() =>
+            var scanner = new ZXing.Net.Maui.Controls.CameraBarcodeReaderView
             {
-                if (ApiClient.Instance.Configure(text))
+                HorizontalOptions = LayoutOptions.Fill,
+                HeightRequest = 320,
+                Options = new ZXing.Net.Maui.BarcodeReaderOptions
                 {
-                    _status.Text = "✅ 연결됨";
-                    _scanner.IsDetecting = false;
-                }
-            });
-        };
+                    Formats = ZXing.Net.Maui.BarcodeFormats.TwoDimensional,
+                    AutoRotate = true,
+                },
+            };
+            scanner.BarcodesDetected += (s, e) =>
+            {
+                var text = e.Results?.FirstOrDefault()?.Value;
+                if (string.IsNullOrEmpty(text)) return;
+                MainThread.BeginInvokeOnMainThread(() =>
+                {
+                    if (ApiClient.Instance.Configure(text))
+                    {
+                        _status.Text = "✅ 연결됨";
+                        scanner.IsDetecting = false;
+                    }
+                });
+            };
+            scannerArea = scanner;
+        }
 
         var connectBtn = new Button { Text = "수동 연결" };
         connectBtn.Clicked += (_, _) =>
@@ -53,7 +64,7 @@ public sealed class ConnectPage : ContentPage
             Content = new VerticalStackLayout
             {
                 Padding = 20, Spacing = 10,
-                Children = { _status, _scanner, _manual, _manualToken, connectBtn, forgetBtn }
+                Children = { _status, scannerArea, _manual, _manualToken, connectBtn, forgetBtn }
             }
         };
     }