A technical blueprint detailing the constraints and workarounds for building iOS custom keyboard extensions, specifically for audio and AI features.
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1. ClawHub CLI
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npx clawhub@latest install ios-keyboard-limitations
2. Manual Installation
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~/.openclaw/skills/ <project>/skills/ Priority: Workspace > Local > Bundled
3. Prompt Installation
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Help me install ios-keyboard-limitations using Clawhub. If Clawhub is not installed, install it first (npm i -g clawhub).
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What is iOS Keyboard Extension Technical Guide?
This skill provides deep technical insights into the iOS keyboard extension sandbox. It highlights critical hard limitations like the lack of microphone access and strict memory caps (~50MB) that often derail projects like voice-to-text keyboards. By integrating this knowledge into your development workflow via Openclaw Skills, you can avoid common pitfalls and architectural dead-ends when building custom input methods for Apple devices. The documentation synthesizes learnings from real-world projects to help developers choose between keyboard extensions, share extensions, or standalone apps.
iOS Keyboard Extension Technical Guide Use Cases
- Planning a custom iOS keyboard with voice-to-text or AI dictation features.
- Troubleshooting silent crashes in keyboard extensions caused by memory pressure.
- Evaluating whether to use a Share Extension versus a Keyboard Extension for specific data input tasks.
- Configuring App Groups to share state between a keyboard and its containing app.
How iOS Keyboard Extension Technical Guide Works
- Analyze the functional requirements of your iOS input tool against the documented sandbox restrictions.
- Identify if Full Access is required for network calls and prepare user onboarding accordingly.
- Implement App Group logic using suite names to enable cross-target communication.
- Optimize memory usage to stay under the ~50MB limit by reducing audio bitrate or cleaning up files immediately.
- Select the most viable architecture based on the provided decision matrix for Openclaw Skills users.
iOS Keyboard Extension Technical Guide Setup
To apply these patterns within an iOS project, ensure your App Groups are configured correctly in Xcode:
# Example of checking for the presence of an App Group identifier in your entitlements
grep -A 1 "com.apple.security.application-groups" YourProject.entitlements
Ensure your KeyboardViewController uses the correct suite for persistence:
let sharedDefaults = UserDefaults(suiteName: "group.com.yourcompany.app")
iOS Keyboard Extension Technical Guide Data Schema & Taxonomy
The skill organizes technical constraints into a structured decision matrix and mitigation table:
| Constraint | Limit / Status | Impact |
|---|---|---|
| Memory | ~50MB | Immediate silent termination if exceeded |
| Microphone | Disallowed | Cannot record audio directly from keyboard |
| Persistence | App Groups Only | Standard UserDefaults will not persist |
| Networking | Full Access Required | Fails unless user enables specific setting |
iOS Keyboard Extension Technical Guide Advanced Features
- Manual Switch Pattern: A logic flow to bridge the Open App gap using manual user triggers and shared clipboard states.
- Siri Shortcuts Integration: Leveraging voice-to-text triggers to bypass keyboard sandbox microphone restrictions.
- Share Extension alternative architecture for complex AI processing that exceeds the keyboard memory footprint.
- Low-bitrate audio optimization strategies specifically for resource-constrained extension environments.
SKILL.md
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