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一、使用PostProcessBuild设置 Unity生成的Xcode Project工程
unity提供了一套api去修改xcode项目工程配置以及修改plist文件内容(当unity build结束后, 会自动回调OnPostProcessBuild).

以下是一些用到的配置处理：
[UnityEditor.Callbacks.PostProcessBuild(999)]
public static void OnPostProcessBuild(BuildTarget BuildTarget, string path)
{
      if(BuildTarget==BuildTarget.iOS)
      {
          OnIOS(path);
      }
}

private static string xcodePath;
private static string sourceSDKPath;
public static void OnIOS(string path)
{
       string projPath = PBXProject.GetPBXProjectPath(path);
       UnityEditor.iOS.Xcode.PBXProject proj = new PBXProject();
       proj.ReadFromString(File.ReadAllText(projPath));
       //获取当前项目名字  
       string target = proj.TargetGuidByName(PBXProject.GetUnityTargetName());
       sourceSDKPath = Application.dataPath;
       sourceSDKPath = sourceSDKPath.Remove(sourceSDKPath.IndexOf("Assets"));
       sourceSDKPath += "SDK/";
       Debug.Log(sourceSDKPath);
       
        以下只做示列:

        //设置编译配置选项  
        proj.SetBuildProperty(target, "ENABLE_BITCODE", "NO");

        //设置 Search FrameWork
        proj.SetBuildProperty(target, "FRAMEWORK_SEARCH_PATHS", "$(inherited)");
        proj.AddBuildProperty(target, "FRAMEWORK_SEARCH_PATHS", "$(PROJECT_DIR)/Frameworks/Plugins/iOS");

         //设置 Search Head
         proj.SetBuildProperty(target, "HEADER_SEARCH_PATHS", "$(SRCROOT)");
         proj.AddBuildProperty(target, "HEADER_SEARCH_PATHS", "$(SRCROOT)/Classes");
         proj.AddBuildProperty(target, "HEADER_SEARCH_PATHS", "$(SRCROOT)/Classes/Native");
         proj.AddBuildProperty(target, "HEADER_SEARCH_PATHS", "$(SRCROOT)/Libraries/bdwgc/include");
         proj.AddBuildProperty(target, "HEADER_SEARCH_PATHS", "$(SRCROOT)/Libraries/libil2cpp/include");

         //设置 Search lib          
         proj.SetBuildProperty(target, "LIBRARY_SEARCH_PATHS", "$(inherited)");
         proj.AddBuildProperty(target, "LIBRARY_SEARCH_PATHS", "$(SRCROOT)");
         proj.AddBuildProperty(target, "LIBRARY_SEARCH_PATHS", "$(SRCROOT)/Libraries");
         proj.AddBuildProperty(target, "LIBRARY_SEARCH_PATHS", "$(SRCROOT)/Libraries/Plugins/iOS");
         proj.AddBuildProperty(target, "LIBRARY_SEARCH_PATHS", "$(PROJECT_DIR)/Libraries");

         //添加依赖库
         proj.AddFrameworkToProject(target, "libiconv.tbd", false);
         proj.AddFrameworkToProject(target, "libz.tbd", false);
         proj.AddFrameworkToProject(target, "libc++.tbd", false);
         proj.AddFrameworkToProject(target, "libsqlite.3.0.tbd", false);
         proj.AddFrameworkToProject(target, "Security.framework", false);

         proj.AddFrameworkToProject(target, "CoreTelephony.framework", false);
         proj.AddFrameworkToProject(target, "SystemConfiguration.framework", false);

         //设置 Comple Flags
         string file = proj.FindFileGuidByProjectPath("Libraries/Plugins/iOS/KeychainItemWrapper.m");
         var flags = proj.GetCompileFlagsForFile(target, file);
         flags.Add("-fno-objc-arc");
         proj.SetCompileFlagsForFile(target, file, flags);
         //保存工程  
         proj.WriteToFile(projPath);

         //修改plist  
         string plistPath = path + "/Info.plist";
         PlistDocument plist = new PlistDocument();
         plist.ReadFromString(File.ReadAllText(plistPath));
         PlistElementDict rootDict = plist.root;

         //iOS10必须  
         rootDict.SetString("NSCameraUsageDescription", "同意使用相机才能拍照");
         rootDict.SetString("NSPhotoLibraryUsageDescription", "同意使用相册才能使用图片"
         PlistElementArray schemes = rootDict.CreateArray("LSApplicationQueriesSchemes");
         schemes.AddString("wechat");
         schemes.AddString("weixin");

         //设置 Security Exception
         PlistElement SecurityElement = rootDict["NSAppTransportSecurity"];
         PlistElementDict appTransportSecurity = null;
         if (SecurityElement == null)
             appTransportSecurity = rootDict.CreateDict("NSAppTransportSecurity");
         else
             appTransportSecurity = SecurityElement.AsDict();

         appTransportSecurity.SetBoolean("NSAllowsArbitraryLoads", true);
         var exceptionDomain = appTransportSecurity.CreateDict("NSExceptionDomains");
         var qqExceptions = exceptionDomain.CreateDict("qq.com");
         qqExceptions.SetBoolean("NSExceptionAllowsInsecureHTTPLoads", true);
         qqExceptions.SetBoolean("NSExceptionRequiresForwardSecrecy", false);
         qqExceptions.SetBoolean("NSIncludesSubdomains", true);

         var backgroundModes = rootDict.CreateArray("UIBackgroundModes");
         backgroundModes.AddString("remote-notification");

         plist.WriteToFile(plistPath);
}

这样就可以自动设置了,  哇卡卡~~~