77 lines
2.6 KiB
Markdown
77 lines
2.6 KiB
Markdown
# 11. Background Fetch & Sync Optimization
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meta:
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id: ios-production-11
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feature: ios-production
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priority: P2
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depends_on: []
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tags: [performance, background, production]
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objective:
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- Optimize background fetch and data sync to keep app data fresh without draining battery
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deliverables:
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- Background fetch configuration
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- Efficient sync strategy
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- Battery usage optimization
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- Background task handling
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steps:
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1. Configure background fetch:
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- Enable Background Fetch in Signing & Capabilities
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- Set minimum fetch interval (15 minutes)
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- Implement application(_:performFetchWithCompletionHandler)
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- Or use BGAppRefreshTask for iOS 13+
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2. Optimize sync strategy:
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- Sync only changed data (delta sync)
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- Use If-Modified-Since or ETag headers
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- Prioritize critical data (alerts, exposures)
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- Defer non-critical sync (reports, historical data)
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3. Implement background tasks:
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- Use BGProcessingTask for heavy operations
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- Schedule periodic dark web scans
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- Schedule spam database updates
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- Handle task expiration gracefully
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4. Optimize battery usage:
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- Batch network requests
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- Use cellular data efficiently
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- Defer sync until WiFi available (optional)
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- Respect low power mode
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5. Handle push notification sync:
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- Silent push notifications for urgent updates
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- Content-available: 1 for background processing
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- Wake app for critical alerts
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6. Add sync status indicators:
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- Last sync timestamp in settings
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- Sync progress for large operations
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- Offline mode indicator
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tests:
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- Unit: Test background task scheduling
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- Integration: Test fetch completion within 30 seconds
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- Battery: Verify minimal battery impact over 24 hours
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acceptance_criteria:
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- Background fetch enabled and configured
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- Data syncs every 15 minutes minimum
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- Delta sync reducing data transfer by >50%
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- Background tasks complete within 30 seconds
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- Battery impact <5% per day from background activity
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- Silent push notifications trigger data refresh
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- Low power mode respected (reduced sync frequency)
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- Sync status visible to user in settings
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- No background task terminations due to timeouts
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validation:
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- Simulate background fetch → data refreshed
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- Check battery settings → Kordant background activity minimal
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- Receive silent push → app updates in background
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- Enable low power mode → sync frequency reduced
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- Monitor network usage → delta sync working
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notes:
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- iOS limits background fetch frequency based on app usage patterns
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- BGAppRefreshTask is modern replacement for performFetch
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- Always call completion handler or setTaskCompleted
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- Background processing tasks require specific entitlements
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