Version Highlight

UniWebView 6 introduces the Channel Messaging System for high-performance bidirectional communication, enhanced error handling, and improved messaging reliability between web pages and Unity.

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UniWebView contains some significant improvements over its predecessor UniWebView 5. Here we will list a few of them to give you an overview about what are added and changed.

Summary

UniWebView 6 focuses on: high-performance bidirectional messaging (Channel Messages), reliability on new iOS versions (transparency clicking through redesign), build automation for Android large app scenarios, and modernization of iOS distribution with XCFramework. Below are the highlights.

Channel Messaging System

UniWebView 6 introduces a revolutionary Channel Messaging System that provides high-performance, bidirectional communication between web pages and Unity.

// Before
window.location.href = "uniwebview://someAction?key=value";

// Now
// Just message.
window.uniwebview.send("playerDied", "Player fell into lava");

// Sync return value.
const userInfo = window.uniwebview.call("getUserInfo", {
  userId: "12345",
});
console.log(`Welcome ${userInfo.userName}!`);

// Or async request.
window.uniwebview.request("loadGameData", {
  saveSlot: 1,
}).then((gameData) => {
  // Start the game on web view...
  initializeGame(gameData);
}).catch((error) => {
  console.error("Failed to load game:", error);
});

This new system addresses the limitations of traditional URL scheme messaging:

Large data transfer support (tested up to tens of MB; performance may degrade beyond ~100MB)
No message loss in high-frequency scenarios
Bidirectional communication with sync/async patterns returning values
Direct JSON object passing without encoding
Enhanced error handling with structured responses
Cross-platform consistency (iOS, Android, Unity)

The Channel Messaging System offers three communication patterns when communicating between the web page and Unity:

Pattern	JavaScript Method	Unity Behavior
Fire-and-Forget	`send(action, data)`	Receiving messages without response
Synchronous Call	`call(action, data)`	Immediate return values
Async Request	`request(action, data)`	Promise-based responses with timeout

This new messaging system eliminates URL encoding overhead and navigation cancellation issues, providing better performance and reliability for communication-heavy applications.

For more information about the Channel Messaging System, please check the Channel Message Guide.

Channel Message Security & Robustness

Alongside the new Channel Messaging System, a comprehensive security guideline is provided. It covers origin validation, input sanitization, replay protection and optional signature verification patterns. See the Channel Message Security guide.

Native Apple Silicon Support

UniWebView 6 introduces XCFramework distribution for iOS, providing native support for Apple Silicon Macs and enhanced development experience:

Native ARM64 Simulator Support: Test on Apple Silicon Mac simulators without conversion tools or Rosetta emulation
Universal Compatibility: Single binary supports both device and simulator architectures
Future-Proof Distribution: Modern Apple distribution format aligned with latest Xcode capabilities
Seamless Unity Integration: Full compatibility with Unity 2021.3.37 LTS and later versions
Simplified Development Workflow: No need for platform-specific library management or manual architecture conversion
Much smaller binary size: The binary will be automatically picked in the built, so you can expect a size optimization for the final product.

This modernization eliminates the previous need for library conversion tools and provides a more robust, developer-friendly experience for iOS development workflows. It is especially useful when you want to debug your game on an iOS simulator.

Clicking Through Redesign

The clicking through feature has been fully redesigned to work reliably on iOS 26 and modern Android systems. Instead of sampling pixels (which became unreliable with HDR rendering and remote layer trees), UniWebView now collaborates with your page. You explicitly mark interactive elements with data-uv-transparency="opaque", and UniWebView builds a precise hit mask.

Benefits:

Works on iOS 26 (previous implementation failed due to HDR / remote layer rendering)
Deterministic and performant (no per-touch pixel sampling)
Supports dynamic updates via RefreshTransparencyClickingThroughLayout()
Backward compatible: the new attributes are ignored safely by older UniWebView versions

See the updated Clicking Through guide for details and migration steps.

Android Local Assets Automation

For Android Split Application Binary builds, UniWebView now automates copying configured folders to the correct android_asset location during Gradle export. This removes the previous error‑prone manual copying process. Configure folders under Preferences > UniWebView > Android Assets, then load them with UniWebViewHelper.StreamingAssetURLForPath as usual. See the Loading Local Files guide for examples.

Logger Performance Improvements

The UniWebView logging system now uses lazy evaluation internally to avoid unnecessary string allocations when a log level is disabled. This reduces overhead in production builds where the log level is typically Critical.

Recommended Platform Targets

Unity 2021.3.37 LTS, 2022.3.23 LTS or any Unity 6 (6000.x) build are our validated environments.
Minimum iOS version is now 12.0.
Android still supports 5.0 (API 21) and above.

Much More

Please check other guides in the side bar and the API Documentation to know more about UniWebView. We strongly suggest you upgrade to the latest version for a more powerful and stable web view component.

If you need to migrate from UniWebView 5 to 6, refer to the Migration Guide (v5 to v6).

You can find other recent changes and all release logs in the Release Note page.

# Version Highlight

# Summary

# Channel Messaging System

# Channel Message Security & Robustness

# Native Apple Silicon Support

# Clicking Through Redesign

# Android Local Assets Automation

# Logger Performance Improvements

# Recommended Platform Targets

# Much More