run on ios

template/devenv.nix

@@ -40,6 +40,23 @@
       echo no | avdmanager create avd -n "Pixel_5_API34" -k "system-images;android-34;google_apis_playstore;${if pkgs.stdenv.hostPlatform.isAarch64 then "arm64-v8a" else "x86_64"}" -d "pixel_5"
     fi
   '';
+  # macOS only: run on the iOS simulator when Xcode with a simulator is installed.
+  scripts.run-ios = lib.mkIf pkgs.stdenv.isDarwin {
+    exec = ''
+      # devenv points DEVELOPER_DIR at the Nix SDK, which xcode-select would echo back.
+      dev_dir="$(/usr/bin/env -u DEVELOPER_DIR /usr/bin/xcode-select -p 2>/dev/null)"
+      [ -x "$dev_dir/usr/bin/simctl" ] || dev_dir=/Applications/Xcode.app/Contents/Developer
+      if ! DEVELOPER_DIR="$dev_dir" /usr/bin/xcrun simctl list devices available 2>/dev/null | grep -q iPhone; then
+        echo "No Xcode iOS simulator found, skipping iOS."
+        exit 0
+      fi
+      # devenv's Nix Apple SDK, xcrun and compiler wrappers break xcodebuild, so build in a clean env.
+      exec /usr/bin/env -i HOME="$HOME" USER="$USER" TERM="$TERM" LANG=en_US.UTF-8 \
+        DEVELOPER_DIR="$dev_dir" \
+        PATH="${lib.makeBinPath [ pkgs.bun pkgs.nodejs_24 pkgs.cocoapods ]}:/usr/bin:/bin:/usr/sbin:/sbin" \
+        bunx expo run:ios --no-bundler "$@"
+    '';
+  };
  <@endif>
   languages.go.enable = true;
   languages.typescript.enable = true;
@@ -100,6 +117,12 @@
         on = "always";
       };
     };
+    # Reuses the Metro bundler started by expodev.
+    expoios = lib.mkIf pkgs.stdenv.isDarwin {
+      exec = "run-ios";
+      cwd = "./apps/mobile";
+      after = ["devenv:processes:expodev@started"];
+    };
     <@endif>
     sqlwatcher = {
       exec = "sqlc generate";