Speed up iOS Development with LLDB Code Injection and Framework Live Preview

ChienJu Lin
LINE Taiwan Engineering 7 iOS Developer
https://linedevday.linecorp.com/jp/2019/sessions/S2-8

1. 2019 DevDay Speed Up iOS Development With LLDB Code Injection and Framework Live Preview > ChienJu Lin > LINE Taiwan Engineering 7 iOS Developer
2. General Development Flow Product Verify Dev Spec Build
3. Pain Point - Long Build Time Product Dev Spec Build Verify
4. Reduce Number of Times
 To Rebuild Whole App
5. Build only the module that currently working on Less Compile Source Count Only Build the Framework Less Build Time
6. > Not embedded/linked by others Clean refactoring might need lots of works Tips for Existing Projects Apply Dummy Framework First Easier To Apply, Refactor Afterwards
7. How To Verify VIEW in Framework?
8. > No need many scrolls and clicks > Preview with different language / device size Interactive Fast Access Preview Under Different Environment SwiftUI / Playground Live Preview > Preview in different view state
9. How To Verify LOGIC in Framework?
10. Test Driven Development in Playground To build faster at every iteration Write Failing Test Make It Pass Refactor Unit Tests / TDD are best to verify logic > Unit Test the framework in playground for interactive environment > Move to test target for CI after completion
11. How To Speed Up Whole App Verification?
12. LLDB Code Injection Modify control flow without rebuild Inject new code using LLDB Command
13. LLDB Code Injection - Example Goal: Inject new view model to asynchronously download
14. LLDB Code Injection - Example 1. Insert breakpoint, enter multi-line expression mode
15. LLDB Code Injection - Example 2. Inject new view model code
16. LLDB Code Injection - Example 3. Execute the injected function
17. LLDB Code Injection - Example 4. Wait the async task to complete. Retrigger the breakpoint, check result & Done.
18. Framework Code Injection Preview Summary
19. Reduce Number of Times
 To Rebuild Whole App
20. Thank You