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Injection introduction 20171120

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Te Cheng Hung

This document discusses Injection for Xcode, a plugin that allows hot reloading code changes in Xcode without rebuilding the project. It works by using method swizzling for classes that inherit from NSObject. The document outlines what Injection for Xcode is, provides a demo, explains how it works and its limitations, discusses its history as a plugin and standalone app, and describes how it can be used for test-driven development.

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Injection for Xcode
Outline ? What¡¯s Injection for Xcode ? Demo ? How it Works & Limitations ? History ? Injection TDD
What¡¯s Injection Plugin for Xcode ¡ú Standalone app (Xcode 8.3.3 & up) Hot Reload (without making any changes to your project) Save compile time Without making any changes to projects Change Compile Find Check > 2 sec, up to minute Change CheckInject < 2 sec
Demo
How it Works & limitations Method Swizzling Must inherit from NSObject (i.e., not struct, enum) Method dispatch must Not be direct dispatch, (i.e., not - final, -private, extension methods) http://bit.ly/2AjZByA
History 1. Before Xcode 8 : direct installed by Alcatraz 2. Xcode 8 : signed Xcode(remember Xcode ghost?) 3. Mac App(Injection II) : for Xcode 8.3.3 4. Mac App(Injection II) : separate version for Xcode 9 5. Mac App(Injection III) : upcoming re-write (mostly) in Swift4
Injection TDD pod InjectionTDD Test all kinds of Swift types with all dispatching mechanisms. http://bit.ly/2lTlKhV
Xcode 9.2 - Build System
Xcode 9 - New Build System
Injection introduction 20171120
Injection introduction 20171120

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Injection introduction 20171120

  • 2. Outline ? What¡¯s Injection for Xcode ? Demo ? How it Works & Limitations ? History ? Injection TDD
  • 3. What¡¯s Injection Plugin for Xcode ¡ú Standalone app (Xcode 8.3.3 & up) Hot Reload (without making any changes to your project) Save compile time Without making any changes to projects Change Compile Find Check > 2 sec, up to minute Change CheckInject < 2 sec
  • 5. How it Works & limitations Method Swizzling Must inherit from NSObject (i.e., not struct, enum) Method dispatch must Not be direct dispatch, (i.e., not - final, -private, extension methods) http://bit.ly/2AjZByA
  • 6. History 1. Before Xcode 8 : direct installed by Alcatraz 2. Xcode 8 : signed Xcode(remember Xcode ghost?) 3. Mac App(Injection II) : for Xcode 8.3.3 4. Mac App(Injection II) : separate version for Xcode 9 5. Mac App(Injection III) : upcoming re-write (mostly) in Swift4
  • 7. Injection TDD pod InjectionTDD Test all kinds of Swift types with all dispatching mechanisms. http://bit.ly/2lTlKhV
  • 8. Xcode 9.2 - Build System
  • 9. Xcode 9 - New Build System