Enable QtQuick compiler for iOS store builds.

Hide "Save Path" as it breaks the UI in General Settings.

qgroundcontrol.pro

@@ -55,6 +55,8 @@ iOSBuild {
         count(APP_ERROR, 1) {
             error("Error building .plist file. 'ForAppStore' builds are only possible through the official build system.")
         }
+        QT               += qml-private
+        CONFIG           += qtquickcompiler
         QMAKE_INFO_PLIST  = $${BASEDIR}/ios/iOSForAppStore-Info.plist
         OTHER_FILES      += $${BASEDIR}/ios/iOSForAppStore-Info.plist
     } else {

src/api/QGCCorePlugin.cc

@@ -175,6 +175,13 @@ bool QGCCorePlugin::adjustSettingMetaData(FactMetaData& metaData)
 #else
         metaData.setRawDefaultValue(true);
         return true;
+#endif
+#if defined(__ios__)
+    } else if (metaData.name() == AppSettings::savePathName) {
+        QString appName = qgcApp()->applicationName();
+        QDir rootDir = QDir(QStandardPaths::writableLocation(QStandardPaths::DocumentsLocation));
+        metaData.setRawDefaultValue(rootDir.filePath(appName));
+        return false;
 #endif
     }
     return true; // Show setting in ui