"Living in background" by Andrey Skrypnik

During last year Andrey with his team was working hard on creating comprehensive tracking application to enhance user's health & productivity. To achieve smooth user experience he has to manage working in background — seamless network updates, reading sensors data, regions monitoring etc. In this talk Andrey will focus on issues he has faced, expectations vs reality, implementation pitfalls and on the Swift aspect of the application. The last but not least thing to cover will be battery usage — Andrey will reveal some patterns to optimize battery usage even with intensive work with sensors.

This talk was made for CocoaHeads Kyiv #11 which took place March 04 2017.

Transcript

1. LIVING IN BACKGROUND From concepts to products
2. Soul Time Tracker – Log Your Day Automatically From concepts to products
3. frameworks From concepts to products 1. CoreLocation - where 2. CoreMotion - when 3. Background App Refresh - how
4. Device preprocess first • All device API in hand • Ability to use new SDK features • Network optimization From concepts to products
5. Apple Watch • only in foreground • low battery • data synchronize problem (steps/sleeps/etc) From concepts to products
6. New in CoreMotion From concepts to products • OLD • NEW
7. one hand gives the other takes From concepts to products • push notifications • emails • popups inside app
8. From concepts to products • . • Э - - . , . Ч ?? • , "В ". • – э ш ( ш ). ( ) • Э . . . э ш . я .
9. OKAY From concepts to products • OKAY
10. Permissions From concepts to products <key>NSLocationAlwaysUsageDescription</key> <string>Allow permissions for this app to ensure accurate tracking</string> <key>NSLocationWhenInUseUsageDescription</key> <string>Allow permissions for this app to ensure accurate tracking</string>
11. Capabilities From concepts to products
12. App Store Page From concepts to products
13. potential reject From concepts to products
14. what is under the hood From concepts to products
15. what is under the hood From concepts to products • start timers • when back to background
16. what is under the hood From concepts to products
17. Constants From concepts to products • Walking: • 20 min | 1.6 km | 80-140 gps • Automotive: • 30 min | 40 km | 90-150 gps
18. guaranteed problems From concepts to products • CoreLocation is very noisy • You receiving points with inaccurate accuracy even if you set it • Cloudiness has a large affect for accuracy • Time-order for points • different hardware suppliers on same iPhone models
19. CLRegion From concepts to products
20. Source GPS From concepts to products
21. Basic GPS Filter 1. Sort points by time 2. Accuracy filter From concepts to products
22. Basic GPS Filter • Kalman filter • or • Catmullrom From concepts to products https://github.com/andrelind/swift-catmullrom
23. still sad From concepts to products
24. Soul & Moves From concepts to products
25. Network 1. collect GPS to 15 points pool 2. calculate steps 3. calculate sleeps 1. additionally use phone locks/unlocks 4. use locks for determinate context 1. driver or passenger 2. use phone on work / home 5. 30 sec debounce for sending From concepts to products
26. Network From concepts to products
27. Battery From concepts to products
28. statistic From concepts to products 1. start time for work – 9:44 2. end time for work – 17:49 (18:03) 3. average commute to work – 1:03:30 4. average commute to home – 31:03 5. average logs per day – 16 6. GPS points in DB – 16.708.814 7. meets – 25641 8. :3
29. Logger & AEConsole From concepts to products https://github.com/ConcepterDev/ShakeLog/ pod ShakeLog
30. Thanks :3 • andrew@concepter.co • concepter.co/soul • github.com/ConcepterDev/ShakeLog/ • github.com/andrelind/swift-catmullrom •linkedin.com/in/andrewskrypnik From concepts to products