code: function setMacro(xcodeProject) {
    var configurations = nonComments(xcodeProject.pbxXCBuildConfigurationSection());
    var config;
    var buildSettings;
  
    for (config in configurations) {
      buildSettings = configurations[config].buildSettings;
      var preprocessorDefs = buildSettings['GCC_PREPROCESSOR_DEFINITIONS'] ? buildSettings['GCC_PREPROCESSOR_DEFINITIONS'] : [];
      if (!preprocessorDefs.length && !isWkWebViewEngineUsed) {
        continue;
      }
  
      if (!Array.isArray(preprocessorDefs)) {
        preprocessorDefs = [preprocessorDefs];
      }
  
      var isModified = false;
      var injectedDefinition = strFormat('"%s=%d"', WKWEBVIEW_MACRO, isWkWebViewEngineUsed);
      preprocessorDefs.forEach(function(item, idx) {
        if (item.indexOf(WKWEBVIEW_MACRO) !== -1) {
          preprocessorDefs[idx] = injectedDefinition;
          isModified = true;
        }
      });
  
      if (!isModified) {
        preprocessorDefs.push(injectedDefinition);
      }
  
      if (preprocessorDefs.length === 1) {
        buildSettings['GCC_PREPROCESSOR_DEFINITIONS'] = preprocessorDefs[0];
      } else {
        buildSettings['GCC_PREPROCESSOR_DEFINITIONS'] = preprocessorDefs;
      }
    }
  }
docs: region Macros injection 
  Inject WKWebView macro into project configuration file.
  
  @param {Object} xcodeProject - xcode project file instance