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- OpenClaw
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- SKILL.md
Tencent SkillHub · Developer Tools
Ios Keyboard Limitations
iOS keyboard extension technical limitations and workarounds. Use when planning or building iOS custom keyboards with voice/audio features, dictation, or system integration needs. Covers memory limits, sandbox restrictions, microphone access, app launching, and viable alternative architectures.
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iOS keyboard extension technical limitations and workarounds. Use when planning or building iOS custom keyboards with voice/audio features, dictation, or system integration needs. Covers memory limits, sandbox restrictions, microphone access, app launching, and viable alternative architectures.
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- SKILL.md
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- 1.0.0
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Documentation
iOS Keyboard Extension Limitations
When building iOS custom keyboards with voice/audio features, these are the hard limitations discovered through the PolyVoice project.
1. Microphone Access — DISALLOWED
Keyboard extensions cannot access the microphone. AVAudioRecorder will fail with permission error SFSpeechRecognizer is unavailable No Siri integration from keyboard context Why: Apple security model — keyboards run in sandbox and could keylog audio.
2. Open Other Apps — BLOCKED
Keyboards cannot programmatically open the main app or any other app. UIApplication.shared.open() returns false URL schemes don't work (myapp://) ExtensionContext.open() not available Why: Prevents malicious keyboards from launching apps without user consent.
3. Memory Limit — ~50MB
Keyboard extensions have strict memory limits (~30-60MB). App terminated silently if exceeded No crash log, just disappears Heavy audio processing = instant death Mitigation: Record at 16kHz mono (not 44.1kHz) Use 32kbps bitrate max Immediate file cleanup after processing 60-second max recording hard limit
4. No Persistent Storage
UserDefaults unavailable, only App Groups. Standard UserDefaults doesn't persist Must use UserDefaults(suiteName: "group.com.company.app") Requires App Group capability in both targets
5. Network Requires "Full Access"
API calls fail without user enabling "Allow Full Access" in Settings. User must explicitly enable: Settings → General → Keyboard → [Keyboard Name] → Allow Full Access Most users won't do this Cannot prompt or explain from keyboard UI effectively
The "Open App" Workaround
Goal: Let user tap a button to open main app for recording. Attempt: // This does NOT work extensionContext?.open(URL(string: "myapp://record")!) Reality: Must use UIApplication.shared.open() outside extension context, but keyboards can't call this.
The Manual Switch Pattern
What actually works (with friction): User taps button in keyboard → Shows alert: "Open PolyVoice to record?" User manually switches to main app (Home button, swipe, etc.) Main app detects active session (via App Groups / shared state) Main app auto-records on appear Auto-stops on silence (2 seconds) Auto-copies to clipboard User manually switches back to target app Keyboard auto-pastes on reappear User flow: Keyboard → Tap mic → [Manual: Switch to app] → App auto-records → [Manual: Switch back] → Keyboard auto-pastes Friction points: Two manual app switches Context switching breaks flow Users forget to return Clipboard may be overwritten
Option 1: Share Extension (Better for Audio)
Use Share Sheet instead of keyboard. Full app capabilities Can record audio Can process and return text Limitation: Not a keyboard — user must open share sheet per text field.
Option 2: Full App Mode
Don't use keyboard extension — use main app only. User opens app Records dictation Copies result Switches to target app Pastes manually Benefit: No memory limits, full mic access, reliable. Cost: More friction than keyboard.
Option 3: Siri Shortcuts Integration
Provide Siri Shortcuts for voice-to-text. "Hey Siri, dictate with PolyVoice" Returns text to current app Fully supported by Apple Limitation: Not instant, requires Siri setup.
📊 Decision Matrix
ApproachMic AccessMemoryUser FrictionApple ApprovedKeyboard extension❌ No⚠️ 50MBLow (if no audio)✅ YesKeyboard + audio workaround❌ No⚠️ 50MB🔴 High✅ YesShare extension✅ Yes✅ Full🟡 Medium✅ YesFull app only✅ Yes✅ Full🟡 Medium✅ YesSiri Shortcuts✅ Yes✅ Full🟡 Medium✅ Yes
🎯 Recommendation
For voice dictation/AI transcription: Don't build a keyboard extension — the limitations make it frustrating Use Share Extension — Apple-supported, full capabilities Or full app — simplest to build, most reliable Add Shortcuts — for power users who want speed For non-audio keyboards (emoji, translation, etc.): Keyboard extension works great. Just avoid audio features.
📚 References
Apple's official docs: https://developer.apple.com/documentation/uikit/keyboards_and_input/creating_a_custom_keyboard Custom Keyboard Programming Guide (WWDC sessions) PolyVoice project learnings (~/Projects/polyvoice-keyboard/)
Category context
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Source: Tencent SkillHub
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Package contents
Included in package
1 Docs
- SKILL.md