fix: exclude NFD from iOS builds

nativefiledialog-extended has no iOS backend (requires AppKit), which
breaks CMake configure with APPKIT_LIBRARY NOTFOUND. Gate it out of the
build for iOS and stub the installer's file picker with a message
pointing at the Files app flow (UIFileSharingEnabled is already set).

Author: yorgunkral31

UnleashedRecomp/CMakeLists.txt

@@ -472,7 +472,6 @@ set(UNLEASHED_RECOMP_LINK_LIBS
     fmt::fmt
     zstd::libzstd
     msdf-atlas-gen::msdf-atlas-gen
-    nfd::nfd
     o1heap
     XenonUtils
     SDL2::SDL2-static
@@ -484,6 +483,10 @@ set(UNLEASHED_RECOMP_LINK_LIBS
     plume
 )
 
+if(NOT IOS)
+    list(APPEND UNLEASHED_RECOMP_LINK_LIBS nfd::nfd)
+endif()
+
 if(CMAKE_SYSTEM_NAME STREQUAL "iOS")
     list(PREPEND UNLEASHED_RECOMP_LINK_LIBS SDL2::SDL2main)
     list(APPEND UNLEASHED_RECOMP_LINK_LIBS "-framework UniformTypeIdentifiers")

UnleashedRecomp/ui/installer_wizard.cpp

@@ -1,6 +1,11 @@
 #include "installer_wizard.h"
 
+#ifdef __APPLE__
+#include <TargetConditionals.h>
+#endif
+#if !TARGET_OS_IPHONE
 #include <nfd.h>
+#endif
 
 #include <apu/embedded_player.h>
 #include <install/installer.h>
@@ -1083,6 +1088,7 @@ static void DrawProgressBar(float progressRatio)
     drawList->AddRectFilledMultiColor(sliderMin, sliderMax, sliderColor0, sliderColor0, sliderColor1, sliderColor1);
 }
 
+#if !TARGET_OS_IPHONE
 static bool ConvertPathSet(const nfdpathset_t *pathSet, std::list<std::filesystem::path> &filePaths)
 {
     nfdpathsetsize_t pathSetCount = 0;
@@ -1132,6 +1138,14 @@ static void PickerThreadProcess()
 
     g_currentPickerResultsReady = true;
 }
+#else
+static void PickerThreadProcess()
+{
+    // NFD has no iOS backend; files are added through the app's Documents folder via the Files app.
+    g_currentPickerErrorMessage = "The file picker is not available on iOS. Copy your game files into this app's Documents folder using the Files app.";
+    g_currentPickerResultsReady = true;
+}
+#endif
 
 static void PickerStart(bool folderMode) {
     if (g_currentPickerThread != nullptr)
@@ -1849,7 +1863,9 @@ bool InstallerWizard::Run(std::filesystem::path installPath, bool skipGame)
     g_installPath = installPath;
 
     EmbeddedPlayer::Init();
+#if !TARGET_OS_IPHONE
     NFD_Init();
+#endif
 
     // Guarantee one controller is initialized. We'll rely on SDL's event loop to get the controller events.
     XAMINPUT_STATE inputState;
@@ -1880,7 +1896,9 @@ bool InstallerWizard::Run(std::filesystem::path installPath, bool skipGame)
     }
 
     GameWindow::SetFullscreenCursorVisibility(false);
+#if !TARGET_OS_IPHONE
     NFD_Quit();
+#endif
 
     InstallerWizard::Shutdown();
     EmbeddedPlayer::Shutdown();

thirdparty/CMakeLists.txt

@@ -24,7 +24,9 @@ if (WIN32)
 endif()
 
 add_subdirectory("${UNLEASHED_RECOMP_THIRDPARTY_ROOT}/msdf-atlas-gen")
-add_subdirectory("${UNLEASHED_RECOMP_THIRDPARTY_ROOT}/nativefiledialog-extended")
+if(NOT IOS)
+    add_subdirectory("${UNLEASHED_RECOMP_THIRDPARTY_ROOT}/nativefiledialog-extended")
+endif()
 add_subdirectory("${UNLEASHED_RECOMP_THIRDPARTY_ROOT}/o1heap")
 add_subdirectory("${UNLEASHED_RECOMP_THIRDPARTY_ROOT}/SDL")
 add_subdirectory("${UNLEASHED_RECOMP_THIRDPARTY_ROOT}/SDL_mixer")