Build A Bridge Mac Swift Library To Unity

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You can use Visual Studio with the cross-platform Mobile development with C++ tools to edit, debug, and deploy iOS code to the iOS Simulator or to an iOS device. But, because of licensing restrictions, the code must be built and run remotely on a Mac. To build and run iOS apps using Visual Studio, you need to set up and configure the remote agent, vcremote, on your Mac. The remote agent handles build requests from Visual Studio and runs the app on an iOS device connected to the Mac, or in the iOS Simulator on the Mac.

Note

For information on using cloud-hosted Mac services instead of a Mac, see Configure Visual Studio to connect to your cloud hosted Mac. The instructions are for building using Visual Studio Tools for Apache Cordova. To use the instructions to build using C++, substitute vcremote for remotebuild.

Once you have installed the tools to build using iOS, refer to this article for ways to quickly configure and update the remote agent for iOS development in Visual Studio and on your Mac.

Prerequisites

To install and use the remote agent to develop code for iOS, you must first have these prerequisites:

  • A Mac computer running macOS Mojave version 10.14 or later

  • An Apple ID

  • An active Apple Developer Program account

    You can get a free account that allows sideloading apps to an iOS device for testing only but not for distribution.

  • Xcode version 10.2.1 or later

    Xcode can be downloaded from the App Store.

  • Xcode command-line tools

    To install the Xcode command-line tools, open the Terminal app on your Mac and enter the following command:

    xcode-select --install

  • An Apple ID account configured in Xcode as a signing identity to sign apps

    To see or set your signing identity in Xcode, open the Xcode menu and choose Preferences. Select Accounts and choose your Apple ID, and then choose the View Details button. See Add your Apple ID account for detailed instructions.

    For detailed information on signing requirements, see What is app signing.

  • If you are using an iOS device for development, a provisioning Profile configured in Xcode for your device

    Xcode provides automatic signing where it creates signing certificates for you as needed. For detailed information about Xcode automatic signing see automatic signing.

    If you want to do manual signing, you need to create a provisioning Profile for your app. For detailed information on creating provisioning Profiles, see Create a development provisioning profile.

  • Node.js version 12.14.1 and npm version 6.13.4

    Install version 12.14.1 of Node.js on your Mac. If you install the Node.js package, it should come with npm version 6.13.4. Other versions of Node.js and npm may not support some modules used in the remote agent vcremote, which can cause vcremote installation to fail. We recommend you install Node.js by using a package manager such as Node Version Manager. Avoid using the command sudo to install Node.js, as some modules can fail to install when using sudo.

Install the remote agent for iOS

When you install the Mobile development with C++ workload, Visual Studio can communicate with vcremote, a remote agent running on your Mac to transfer files, build and run your iOS app, and send debugging commands.

Before you install the remote agent, make sure you have satisfied the Prerequisites and completed the installation steps in Install cross-platform mobile development with C++.

To download and install the remote agent

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  • From the Terminal app on your Mac, verify that the Node.js version currently in use is the required version 12.14.1. To verify the version, run the command:

    node -v

    If it's not the right version, you may need to follow the Node.js installation instructions in the prerequisites. Then, restart Node.js.

  • After verifying the required Node.js is in use, run this command to install vcremote under that Node.js version:

    npm install -g --unsafe-perm vcremote

    The global installation (-g) switch is recommended, but not required. If you don't use the global installation switch, vcremote gets installed under the current active path in the Terminal app.

    During the installation, vcremote is installed and developer mode is activated on your Mac. Homebrew and two npm packages, vcremote-lib and vcremote-utils, are also installed. When installation completes, it's safe to ignore any warnings about skipped optional dependencies.

    Note

    To install Homebrew, you must have sudo (administrator) access. If you need to install vcremote without sudo, you can install Homebrew manually in a usr/local location and add its bin folder to your path. For more information, see the Homebrew documentation. To manually enable developer mode, enter this command in the Terminal app: DevToolsSecurity -enable

If you update to a new version of Visual Studio, you must update to the current version of the remote agent as well. To update the remote agent, repeat the steps to download and install the remote agent.

Start the remote agent

Library

The remote agent must be running for Visual Studio to build and run your iOS code. Visual Studio must be paired with the remote agent before it can communicate. By default, the remote agent runs in secured connection mode, which requires a PIN to pair with Visual Studio.

To start the remote agent

  • From the Terminal app on your Mac, enter:

    vcremote

    This command starts the remote agent with a default build directory of ~/vcremote. For additional configuration options, see Configure the remote agent on the Mac.

The first time you start the agent, and every time you create a new client certificate, you are provided with the required information to configure the agent in Visual Studio, including the host name, the port, and the PIN.

If you intend to configure the remote agent in Visual Studio using the host name, ping the Mac from Windows using the host name to verify that it is reachable. Otherwise, you may need to use the IP address instead.

The generated PIN is for one time use, and is only valid for a limited time. If you do not pair Visual Studio with the remote agent before the time expires, you will need to generate a new PIN. For more information, see Generate a new security PIN.

You can use the remote agent in unsecured mode. In unsecured mode, the remote agent can be paired to Visual Studio without a PIN.

To disable secured connection mode

  • To disable secured connection mode in vcremote, enter this command in the Terminal app on your Mac:

    vcremote --secure false

To enable secured connection mode

  • To enable secured connection mode, enter this command:

    vcremote --secure true

Once you have started the remote agent, you can use it from Visual Studio until you stop it.

To stop the remote agent

  • In the Terminal window vcremote is running in, enter Control+C.

Configure the remote agent in Visual Studio

To connect to the remote agent from Visual Studio, you must specify the remote configuration in the Visual Studio options.

To configure the remote agent from Visual Studio

  1. If the agent is not already running on your Mac, follow the steps in Start the remote agent. Your Mac must be running vcremote for Visual Studio to successfully pair, connect, and build your project.

  2. On your Mac, get the host name or IP address of your Mac.

    You can get the IP address by using the ifconfig command in a Terminal window. Use the inet address listed under the active network interface.

  3. On the Visual Studio menu bar, choose Tools, Options.

  4. In the Options dialog box, expand Cross Platform, C++, iOS.

  5. In the Host Name and Port fields, enter the values specified by the remote agent when you started it. The host name can be the DNS name or IP address of your Mac. The default port is 3030.

    Note

    If you cannot ping the Mac using the host name, you may need to use the IP address.

  6. If you use the remote agent in the default secured connection mode, check the Secure checkbox, then enter the PIN value specified by the remote agent in the Pin field. If you use the remote agent in unsecured connection mode, clear the Secure checkbox and leave the Pin field blank.

  7. Choose Pair to enable the pairing.

    The pairing persists until you change the host name or port. If you change the host name or port in the Options dialog box, to undo the change, choose the Revert button to revert to the previous pairing.

    If the pairing does not succeed, verify that the remote agent is running by following the steps in Start the remote agent. If too much time has passed since the remote agent PIN was generated, follow the steps in Generate a new security PIN on the Mac and then try again. If you are using the host name of your Mac, try using the IP address in the Host Name field instead.

  8. Update the folder name in the Remote Root field to specify the folder used by the remote agent in your home (~) directory on the Mac. By default, the remote agent uses /Users/<username>/vcremote as the remote root.

  9. Choose OK to save the remote pairing connection settings.

Visual Studio uses the same information to connect to the remote agent on your Mac each time you use it. You do not need to pair Visual Studio with the remote agent again unless you generate a new security certificate on your Mac, or its hostname or IP address changes.

Generate a new security PIN

When you start the remote agent the first time, the generated PIN is valid for a limited amount of time—by default, 10 minutes. If you don't pair Visual Studio to the remote agent before the time expires, you will need to generate a new PIN.

To generate a new PIN

  1. Stop the agent, or open a second Terminal app window on your Mac and use that to enter the command.

  2. Enter this command in the Terminal app:

    vcremote generateClientCert

    The remote agent generates a new temporary PIN. To pair Visual Studio by using the new PIN, repeat the steps in Configure the remote agent in Visual Studio.

Generate a new server certificate

For security purposes, the server certificates that pair Visual Studio with the remote agent are tied to the IP address or host name of your Mac. If these values change, you must generate a new server certificate, and then reconfigure Visual Studio with the new values.

To generate a new server certificate

  1. Stop the vcremote agent.

  2. Enter this command in the Terminal app:

    vcremote resetServerCert

  3. When prompted for confirmation, enter Y.

  4. Enter this command in the Terminal app:

    vcremote generateClientCert

    This command generates a new temporary PIN.

  5. To pair Visual Studio by using the new PIN, repeat the steps in Configure the remote agent in Visual Studio.

Configure the remote agent on the Mac

You can configure the remote agent using various command-line options. For example, you can specify the port to listen for build requests and specify the maximum number of builds to maintain on the file system. By default, the limit is 10 builds. The remote agent will remove builds that exceed the maximum on shutdown.

To configure the remote agent

  • To see a complete list of remote agent commands, in the Terminal app, enter:

    vcremote --help

  • To disable secure mode and enable simple HTTP-based connections, enter:

    vcremote --secure false

    When you use this option, clear the Secure checkbox and leave the Pin field blank when configuring the agent in Visual Studio.

  • To specify a location for remote agent files, enter:

    vcremote --serverDir directory_path

    where directory_path is the location on your Mac to place log files, builds, and server certificates. By default, this location is /Users/<username>/vcremote. Builds are organized by build number in this location.

  • To use a background process to capture stdout and stderr to a file named server.log, enter:

    vcremote > server.log 2>&1 &

    The server.log file can assist in troubleshooting build issues.

  • To run the agent by using a configuration file instead of command-line parameters, enter:

    vcremote --config config_file_path

    where config_file_path is the path to a configuration file in JSON format. The startup options and their values must not include dashes.

Troubleshoot the remote agent

Debugging on an iOS device

Mac

If debugging on an iOS device does not work, there could be issues with the tool ideviceinstaller, which is used to communicate with an iOS device. This tool is typically installed from Homebrew during the installation of vcremote. Follow the steps below as a workaround.

Open the Terminal app and update ideviceinstaller and its dependencies by running the following commands in order:

  1. Ensure Homebrew is updated

    brew update

  2. Uninstall libimobiledevice and usbmuxd

    brew uninstall --ignore-dependencies libimobiledevice

    brew uninstall --ignore-dependencies usbmuxd

  3. Install the latest version of libimobiledevice and usbmuxd

    brew install --HEAD usbmuxd

    brew unlink usbmuxd

    brew link usbmuxd

    brew install --HEAD libimobiledevice

  4. Uninstall and reinstall ideviceinstaller

    brew uninstall ideviceinstaller

    brew install ideviceinstaller

Verify that ideviceinstaller can communicate with the device by trying to list the apps installed on the device:

ideviceinstaller -l

If ideviceinstaller errors that it cannot access the folder /var/db/lockdown, change the privilege on the folder with:

sudo chmod 777 /var/db/lockdown

Then verify again if ideviceinstaller can communicate with the device.

See also

Google is committed to advancing racial equity for Black communities. See how.

Real-time communication for the web

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With WebRTC, you can add real-time communication capabilities to your application that works on top of an open standard. It supports video, voice, and generic data to be sent between peers, allowing developers to build powerful voice- and video-communication solutions. The technology is available on all modern browsers as well as on native clients for all major platforms. The technologies behind WebRTC are implemented as an open web standard and available as regular JavaScript APIs in all major browsers. For native clients, like Android and iOS applications, a library is available that provides the same functionality. The WebRTC project is open-source and supported by Apple, Google, Microsoft and Mozilla, amongst others. This page is maintained by the Google WebRTC team.

What can WebRTC do?

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There are many different use-cases for WebRTC, from basic web apps that uses the camera or microphone, to more advanced video-calling applications and screen sharing. We have gathered a number of code samples to better illustrate how the technology works and what you can use it for.

Application flow

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A WebRTC application will usually go through a common application flow. Accessing the media devices, opening peer connections, discovering peers, and start streaming. We recommend that new developers read through our introduction to WebRTC before they start developing.
Data

Next steps

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Start with our codelab to become familiar with the WebRTC APIs for the web (JavaScript).