public static void OnBuildPostprocess(IBuildProcessor processor)
        {
            if (processor is iOSBuildProcessor)
            {
                iOSBuildProcessor ios;
                ios = processor as iOSBuildProcessor;

                string projectPath;
                projectPath = Path.Combine(ios.XcodeProjectPath, "Unity-iPhone.xcodeproj/project.pbxproj");

                PBXProject project;
                project = new PBXProject();
                project.ReadFromFile(projectPath);

                string submodulePath;
                submodulePath = SubmoduleMap.GetSubmodulePath(typeof(SagoApp.SubmoduleInfo));

                string nativeAssetsPath;
                nativeAssetsPath = Path.Combine(ios.ProjectPath, Path.Combine(submodulePath, "Plugins/iOS/.Native"));

                string target;
                target = project.TargetGuidByName(PBXProject.GetUnityTargetName());

                project.AddFileToBuild(target, project.AddFile(
                                           Path.Combine(nativeAssetsPath, "AudioSessionUtil.h"),
                                           Path.Combine("SagoApp", "AudioSessionUtil.h"),
                                           PBXSourceTree.Source
                                           ));

                project.AddFileToBuild(target, project.AddFile(
                                           Path.Combine(nativeAssetsPath, "AudioSessionUtil.mm"),
                                           Path.Combine("SagoApp", "AudioSessionUtil.mm"),
                                           PBXSourceTree.Source
                                           ));

                project.AddFileToBuild(target, project.AddFile(
                                           Path.Combine(nativeAssetsPath, "SAOnDemandResourceUtil.h"),
                                           Path.Combine("SagoApp", "SAOnDemandResourceUtil.h"),
                                           PBXSourceTree.Source
                                           ));

                project.AddFileToBuild(target, project.AddFile(
                                           Path.Combine(nativeAssetsPath, "SAOnDemandResourceUtil.mm"),
                                           Path.Combine("SagoApp", "SAOnDemandResourceUtil.mm"),
                                           PBXSourceTree.Source
                                           ));

                project.AddFileToBuild(target, project.AddFile(
                                           Path.Combine(nativeAssetsPath, "SAInstalledAppsHelper.h"),
                                           Path.Combine("SagoApp", "SAInstalledAppsHelper.h"),
                                           PBXSourceTree.Source
                                           ));

                project.AddFileToBuild(target, project.AddFile(
                                           Path.Combine(nativeAssetsPath, "SAInstalledAppsHelper.mm"),
                                           Path.Combine("SagoApp", "SAInstalledAppsHelper.mm"),
                                           PBXSourceTree.Source
                                           ));

                // Open source third-party library for Unity for storing data in iOS keychain.
                project.AddFileToBuild(target, project.AddFile(
                                           Path.Combine(nativeAssetsPath, "UICKeyChainStore.h"),
                                           Path.Combine("SagoApp", "UICKeyChainStore.h"),
                                           PBXSourceTree.Source
                                           ));
                project.AddFileToBuild(target, project.AddFile(
                                           Path.Combine(nativeAssetsPath, "UICKeyChainStore.m"),
                                           Path.Combine("SagoApp", "UICKeyChainStore.m"),
                                           PBXSourceTree.Source
                                           ));

                project.AddFileToBuild(target, project.AddFile(
                                           Path.Combine(nativeAssetsPath, "SAKeychainStore.h"),
                                           Path.Combine("SagoApp", "SAKeychainStore.h"),
                                           PBXSourceTree.Source
                                           ));

                project.AddFileToBuild(target, project.AddFile(
                                           Path.Combine(nativeAssetsPath, "SAKeychainStore.mm"),
                                           Path.Combine("SagoApp", "SAKeychainStore.mm"),
                                           PBXSourceTree.Source
                                           ));

                project.AddFileToBuild(target, project.AddFile(
                                           Path.Combine(nativeAssetsPath, "UnityViewController+DeferSystemGestures.mm"),
                                           Path.Combine("SagoApp", "UnityViewController+DeferSystemGestures.mm"),
                                           PBXSourceTree.Source
                                           ));

                project.AddFileToBuild(target, project.AddFile(
                                           Path.Combine(nativeAssetsPath, "SendEmailUtil.h"),
                                           Path.Combine("SagoApp", "SendEmailUtil.h"),
                                           PBXSourceTree.Source
                                           ));

                project.AddFileToBuild(target, project.AddFile(
                                           Path.Combine(nativeAssetsPath, "SendEmailUtil.mm"),
                                           Path.Combine("SagoApp", "SendEmailUtil.mm"),
                                           PBXSourceTree.Source
                                           ));

                // Following section of code is to fix error caused when disposing Unity's OnDemandResourcesRequest
                // even though ODR download is incomplete.

                // First find Unity's original copy of OnDemandREsources.mm file and remove it.
                string onDemandResourcesFileGuid = project.FindFileGuidByProjectPath("Classes/Unity/OnDemandResources.mm");
                project.RemoveFile(onDemandResourcesFileGuid);
                // Now add our updated implmentation of OnDemandResources.mm file.
                project.AddFileToBuild(target, project.AddFile(
                                           Path.Combine(nativeAssetsPath, "OnDemandResources.mm"),
                                           Path.Combine("Classes/Unity", "OnDemandResources.mm"),
                                           PBXSourceTree.Source
                                           ));

                // Adding odr_update_bug_fix.txt & odr_update_bug_fix_v2.txt file to Xcode project and marking
                // it with initial install tag to fix ODR update bug.
                //
                // Jira: https://sagosago.atlassian.net/browse/SW-168
                                #if ENABLE_IOS_ON_DEMAND_RESOURCES
                bool hasOdrAssetBundle = HasOnDemandResourcesAssetBundle;
                if (hasOdrAssetBundle)
                {
                    // odr_update_bug_fix.txt
                    string odrUpdateBugFixResTag      = "odr_update_bug_fix";
                    string odrUpdateBugFixResFileName = "odr_update_bug_fix.txt";
                    string targetGuid = project.TargetGuidByName(PBXProject.GetUnityTargetName());
                    string odrUpdateBugFixResFileGuid = null;
                    project.AddFileToBuild(target, project.AddFile(
                                               Path.Combine(nativeAssetsPath, odrUpdateBugFixResFileName),
                                               Path.Combine("SagoApp", odrUpdateBugFixResFileName),
                                               PBXSourceTree.Source
                                               ));
                    odrUpdateBugFixResFileGuid = project.FindFileGuidByProjectPath(Path.Combine("SagoApp", odrUpdateBugFixResFileName));
                    project.AddAssetTagForFile(targetGuid, odrUpdateBugFixResFileGuid, odrUpdateBugFixResTag);
                    project.AddAssetTagToDefaultInstall(targetGuid, odrUpdateBugFixResTag);

                    // odr_update_bug_fix_v2.txt
                    odrUpdateBugFixResTag      = "odr_update_bug_fix_v2";
                    odrUpdateBugFixResFileName = "odr_update_bug_fix_v2.txt";
                    targetGuid = project.TargetGuidByName(PBXProject.GetUnityTargetName());
                    odrUpdateBugFixResFileGuid = null;
                    project.AddFileToBuild(target, project.AddFile(
                                               Path.Combine(nativeAssetsPath, odrUpdateBugFixResFileName),
                                               Path.Combine("SagoApp", odrUpdateBugFixResFileName),
                                               PBXSourceTree.Source
                                               ));
                    odrUpdateBugFixResFileGuid = project.FindFileGuidByProjectPath(Path.Combine("SagoApp", odrUpdateBugFixResFileName));
                    project.AddAssetTagForFile(targetGuid, odrUpdateBugFixResFileGuid, odrUpdateBugFixResTag);
                    project.AddAssetTagToDefaultInstall(targetGuid, odrUpdateBugFixResTag);
                }
                                #endif

                project.WriteToFile(projectPath);

                // There is a bug with Unity's XcodeAPI with how it adds resources to initial install tags.
                // It adds to "knownAssetTags" instead of "KnownAssetTags".
                // So we are actually modifying .pbxproj file by search and replace as a work around.
                                #if ENABLE_IOS_ON_DEMAND_RESOURCES
                if (hasOdrAssetBundle)
                {
                    string pbxProjFileText = File.ReadAllText(projectPath);
                    if (pbxProjFileText.Contains("KnownAssetTags"))
                    {
                        throw new System.Exception(string.Format(@"Failed to search and replace 'knownAssetTags' with 'KnownAssetTags'
								in file {0}. Try merging existing 'KnownAssetTags' value instead."                                , projectPath));
                    }
                    pbxProjFileText = pbxProjFileText.Replace("knownAssetTags", "KnownAssetTags");
                    File.WriteAllText(projectPath, pbxProjFileText);
                }
                                #endif


                //Adding few permissions to Info.plist for iOS platform.

                // Get plist
                string        plistPath = ios.XcodeProjectPath + "/Info.plist";
                PlistDocument plist     = new PlistDocument();
                plist.ReadFromString(File.ReadAllText(plistPath));

                // Get root
                PlistElementDict rootDict = plist.root;

                // Adding iOS permission string values for several permissions that our apps possibly need to Info.plist.
                rootDict.SetString("NSPhotoLibraryUsageDescription", "This app would like to save photos to your camera roll.");
                rootDict.SetString("NSCameraUsageDescription", "This activity requires secure access to your camera.");

                // Apple did not reject app submissions even though the following permissions have their values left empty,
                // so we are just going to leave them empty.
                rootDict.SetString("NSMicrophoneUsageDescription", "");
                rootDict.SetString("NSMotionUsageDescription", "");

                // Leaving this permission's string value empty as well.
                // This is a new permission for iOS 11.
                // Any addtional permissions that needs to be added, refer to:
                // https://developer.apple.com/library/content/documentation/General/Reference/InfoPlistKeyReference/Articles/CocoaKeys.html
                rootDict.SetString("NSPhotoLibraryAddUsageDescription", "");

                // Write to file
                File.WriteAllText(plistPath, plist.WriteToString());
            }
        }