Cross-platform : Picking the best option for your next iOS/Android app

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Should you consider a cross-platform solution for your next app? During this talk I presented an overview of some of the most popular cross-platform solutions. Also, I described how putting API specs at the center of your workflow could be a good alternative if cross-platform is not a good fit for your project or your team. AppDays, Paris - November 15th 2017

Software

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Cross-platform :
Picking the best option for
your next iOS/Android app
Patrick Nollet (@PatrickNLT)
Lead Mobile Developer
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Cross-platform :
Picking the best option for your next iOS/Android app
1. What do you mean by 'cross-platform'?
2. Pros and cons of a cross-platform
solution
3. Available cross-platform options
4. Our approach at ClassHeroes

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What do you mean by
'cross-platform'? 🤔

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From native to cross-platform

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From native to cross-platform
Solution : Share a common cross-platform code base
Small library Whole app

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Pros and cons of a
cross-platform solution 👍👎

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Pros 👍
DRY (Don't Repeat Yourself)
Synchronization between teams
Synchronized releases
No need to update the app (JS)

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Cons 👎
Hard to match native look & feel
Still need iOS and Android experts
Third-party tool
One more layer
Performance

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Xamarin
All-in-one
Shared app logic
Shared UI thanks to Xamarin.Forms (optional)
C#
Nice and mature language
Native performance
Hard to find experienced developers

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Cordova / PhoneGap / Ionic
JavaScript frameworks
Mostly Web Apps with access to native APIs
Targeted at web developers
Limitations:
Performance
UI

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React Native
JavaScript
Same design as React
"Learn once, write anywhere"
Native UI components
Hot Reloading

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Other approach:
only share App logic

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C++
Most common option
iOS: Objective-C++
Android: JNI
Djinni: interfacing with Java and Objective-C
Bjarne Stroustrup

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J2ObjC
Java to Objective-C translator
Developed by Google
Native performance
Small project, rough edges

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Go Mobile
Go: popular language among backend developers
Experimental
Go ❤ Java & Objective-C

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Our app
Thin layer above the API
UI at the core
Team of native mobile developers
App Logic
10 %
UI
90 %
Not a good candidate for a cross-
platform approach 😞

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We can do more 💪
Cross-platform : Keep platforms in sync
Our case: iOS, Android, Web, Back office
Solution: Exhaustive API specs
Swagger format

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Mocking server
Generates fake data from Swagger spec
💡backend integration tests
We use the swagger-mock-api middleware (uses Chance.js)

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ActionScript
Ada
Apex
Bash
C# (.net 2.0, 4.0 or later)
C++ (cpprest, Qt5, Tizen)
Clojure
Dart
Elixir
Eiffel
Go
Groovy
Haskell (http-client, Servant)
Java (Jersey1.x, Jersey2.x, OkHttp, Retrofit1.x,
Retrofit2.x, Feign, RestTemplate, RESTEasy, Vertx)
Kotlin
Lua
Node.js (ES5, ES6)
Objective-C
Perl
PHP
PowerShell
Python
R
Ruby
Rust
Scala (akka, http4s, swagger-async-httpclient)
Swift (2.x, 3.x, 4.x)
Typescript (Angular1.x, Angular2.x, jQuery)
Client API code generation
swagger-codegen
Dozens of templates
Android: Retrofit, RxJava…
iOS: Objective-C, Swift…
Alternative: SwagGen (Swift)

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What did we learn?
Specs are helpful
Global thinking about your product
Big velocity gains:
Independent implementation and tests
Focus on what's important
Monorepo

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In a nutshell
Shared app logic vs UI
⚠ cross-platform may not be the best fit!
In any case, consider using specs

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The End
@PatrickNLT
Blog post: http://patrick.nollet.org

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