Save the Environment with Xcode

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Save the environment with Xcode One line can change a code... Manuel @stuffmc Carrasco Molina Code 4 Future @stuffmc • Save the environment with Xcode, June '19, AltConf Paris

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@stuﬀmc • Save the environment with Xcode, June '19, AltConf Paris ! 2

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> whoami && whyami? ✔ ! guy born in " living in since 16 years → ✔ 22 years of software dev, 11 with techs → ✔ 8 years of political involvement with the party ✔ 5 years of climate ) & refugees activism ✔ 6 + years , without - meat, half of it vegan @stuﬀmc • Save the environment with Xcode, June '19, AltConf Paris ! 3

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Ethics FTW This talk is about your Karma... @stuﬀmc • Save the environment with Xcode, June '19, AltConf Paris ! 4

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One line can change the code ✔ If can change the code, it can change the App ✔ If can change the App, it can change the Phone ✔ With over 2.2 billion Phones... ✔ It can change the World! @stuﬀmc • Save the environment with Xcode, June '19, AltConf Paris ! 6

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Your Code can change the world ✔ Don't let energy optimization be the next testing ✔ There's never enough time or money for testing ✔ Same with Security... ✔ Some Security Company have no time for design @stuﬀmc • Save the environment with Xcode, June '19, AltConf Paris ! 7

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Settings > Battery ✔ Where the user will go if the battery is draining. ✔ You don't want your app in this list. ✔ It's like the losers list. @stuﬀmc • Save the environment with Xcode, June '19, AltConf Paris ! 8

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What is Energy? @stuﬀmc • Save the environment with Xcode, June '19, AltConf Paris ! 11

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@stuﬀmc • Save the environment with Xcode, June '19, AltConf Paris ! 12

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@stuﬀmc • Save the environment with Xcode, June '19, AltConf Paris ! 13

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The 4 !fantastics numbe @stuﬀmc • Save the environment with Xcode, June '19, AltConf Paris ! 14

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Four by Four ✔ Identify the problem that is causing the drain ✔ Optimize the code for less battery usage ✔ Reduce the amount of things your code do ✔ Coalesce tasks that can be grouped together @stuﬀmc • Save the environment with Xcode, June '19, AltConf Paris ! 15

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[Background] Processing ✔ Avoid NSTimer (User refresh, notiﬁcation, ...) ✔ Call Completion Handler! @stuﬀmc • Save the environment with Xcode, June '19, AltConf Paris ! 16

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@stuﬀmc • Save the environment with Xcode, June '19, AltConf Paris ! 17

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@stuﬀmc • Save the environment with Xcode, June '19, AltConf Paris ! 18

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Networking ✔ Use NSURLSessionTask's earliestBeginDate ✔ Balance between huge calls and many tiny calls ✔ More network requests = more energy ✔ Session Conﬁg: waitsForConnectivity @stuﬀmc • Save the environment with Xcode, June '19, AltConf Paris ! 19

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Sending analytics ✔ The best way to do it? Don't send analytics. ✔ Your company forces to do so? Can't quit? ✔ Send them in batches ✔ Session Conﬁg: discretionary @stuﬀmc • Save the environment with Xcode, June '19, AltConf Paris ! 20

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Location ✔ start/stopLocation? requestLocation! ✔ Region Monitoring instead of checking location! ✔ Lower location accuracy (to 3 KM if you can) ✔ Don't forget to stop (when you get enough)! @stuﬀmc • Save the environment with Xcode, June '19, AltConf Paris ! 21

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Graphics ✔ Minimize screen updates ✔ Review blur usage ✔ Do you really need that animation? ✔ OpenGL? Make your app mux-aware @stuﬀmc • Save the environment with Xcode, June '19, AltConf Paris ! 22

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Video Player ✔ Optimized from Apple ✔ Don't show persistent UI Controls too long ✔ Tagesschau layers controls on top @stuﬀmc • Save the environment with Xcode, June '19, AltConf Paris ! 23

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Da Tools 24

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Energy Gauges Not working on Simulator @stuﬀmc • Save the environment with Xcode, June '19, AltConf Paris 25

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@stuﬀmc • Save the environment with Xcode, June '19, AltConf Paris ! 26

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@stuﬀmc • Save the environment with Xcode, June '19, AltConf Paris ! 27

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Fore/Background/ Suspended @stuﬀmc • Save the environment with Xcode, June '19, AltConf Paris ! 28

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@stuﬀmc • Save the environment with Xcode, June '19, AltConf Paris ! 29

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Instruments ✔ Untethered Profiling! ✔ Maybe environmental problems ✔ Many Profiling Templates ✔ Many Talks @ Conferences @stuffmc • Save the environment with Xcode, June '19, AltConf Paris ! 30

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Energy Logs & Organizer ✔ Similar to crash logs ✔ Agregated Logs from your users ✔ 2 weeks of History ✔ Data from TestFlight and App Store @stuﬀmc • Save the environment with Xcode, June '19, AltConf Paris ! 31

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References ✔ WWDC 17: Writing Energy Efficient Apps ✔ WWDC 18: What’s New in Energy Debugging ✔ Energy Efficiency Guide for iOS Apps @stuffmc • Save the environment with Xcode, June '19, AltConf Paris ! 33