Open Source - Speaker Deck

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Open Source An overview of why open source is key to building mobile software. By: Conrad Stoll, @conradstoll Architect, Mutual Mobile

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How do you build an application?

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How do I participate in the community?

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Learning about Dependencies

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Shared Problems Deserve Shared Solutions

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What sort of problems?

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Communication over a network Responsive User Interface Data Persistence Testing Dependency Management

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Great Open Source software Very applicable to other people

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Sometimes it takes multiple people To solve a hard problem

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What can you do with Open Source?

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1. You can use it 2. You can contribute to it 3. You can make your own

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1. Using Open Source Open Source tools help you focus on the real work you need to do.

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Focus on solving the key problems for your project.

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Web Frameworks Django Rails Node Angular

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HTTP Networking

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AFNetworking

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OkHttp

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User Interface

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Challenges Building User Interfaces

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Animation Animation conveys meaning and makes your app more delightful.

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Performance Interfaces should be fast and get out of the users way.

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Facebook Immensely complex app Polished UI

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Tools React ReactNative ComponentKit

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Paper Diﬀerent take on Facebook, with an amazing interface

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Tools AsyncDisplayKit Pop Tweaks

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Consistency Making an app feel familiar to users on the platform

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MMDrawerController You know those side menus on iOS apps?

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Super common problem Thousands of apps do this.

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Super easy to use library to build a side menu Over 4000 stars on GitHub

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Data Persistence

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SQLite Used for...just about everything.

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Realm Competitor to SQLite Partially open source, with a full company around it. Designed for Mobile!

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MMRecord Serialization, between REST and Core Data

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We were solving the same problem in all of our projects

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Ridiculously easy to connect a web service to Core Data Used across many projects at Mutual Mobile and hundreds of other projects in the community.

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Consider how you use Open Source dependencies

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Dependency Injection Don't allow your database code to seep into your views.

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Dependency Management Know what versions you're using and if they're maintained.

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2. Contributing to Open Source Are you using Open Source? What could you do to make it better?

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Look at the libraries you are using. Do they have any problems?

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XMPPFramework Multithreading and crashing problems Submitted updates to ﬁx them

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Urban Airship Super popular push notiﬁcation provider

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Fixed several issues with their SDK for iOS

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How to contribute back?

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STOP! Don't write code yet.

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First Step: Identify the Problem Is the problem in the library, or with your implementation of it?

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Second Step: Ask for Feedback (Before you write code!)

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Third Step: Make your contribution easy to accept

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Submit clean code Match the style of the library you're contributing to

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Write tests if you're ﬁxing a bug And of course, manually test the code yourself

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Create beautiful programmer interfaces Think of developers as your users Eliminate typos, write documentation, think about your method names

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So why should you contribute?

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Improve the tools that you already use Part of being a good citizen in the developer community

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Learn about how things work Open a library up and read it. Figure out how it works. Learn something new.

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Build your Portfolio Contributing to open source is great practice. It's good for your career!

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3. Releasing Open Source Share openly Solve important problems

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Have you seen the same problem twice? Do you have a solution for it? Bingo!

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Make it Easy to Use The key to great open source is ease of use.

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API Make it Intuitive Keep it Simple

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Documentation Write detailed header documentation. Clearly explain how to use your library.

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Examples Include examples of how to use your library.

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Solve an obvious problem Make your library something that resonates with people.

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MMWormhole

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Inter Process Communication How do you share information between the watch app and the iPhone app?

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Apple didn't provide a solution for this Left to developers to ﬁgure out how to do it

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We Solved It! And we made it SUPER easy to use.

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Shared with everyone Posted on developer forums Posted on Twitter

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Used in Thousands of Apps Best way to communicate between iPhone and Watch app

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Easily Extendable Updated to support watchOS 2

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Final Thoughts

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Living Reference Don't forget about your project Challenges with Swift

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Water Cooler Provide a place for people to discuss common problems

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Adapt and Evolve AFNetworking - Objective-C Alamoﬁre - Swift

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AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager]; [manager GET:@"http://example.com/resources.json" parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) { NSLog(@"JSON: %@", responseObject); } failure:^(AFHTTPRequestOperation *operation, NSError *error) { NSLog(@"Error: %@", error); }]; Alamofire.request(.GET, "http://httpbin.org/get")