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> ChienJu Lin / LINE Taiwan Engineering Speed up iOS Development 
 with LLDB Code Injection 
 and Framework Live Preview 

General Development Flow Product Verify Dev Spec Build 

Product Verify Dev Spec Build Pain Point - Long Build Time 

Reduce Number of Times
 To Rebuild Whole App 

Build only the module that currently working on Less Compile Source Count Only Build the Framework Less Build Time Coordinator Pattern Dependency Injection Framework 

> 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 

How To Verify VIEW in Framework? 

> 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 

How To Verify LOGIC in Framework? 

Test Driven Development in Playground To build faster at every iteration 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 Write Failing Test Make It Pass Refactor 

How To Speed Up Whole App Verification? 

LLDB Code Injection Modify control flow without rebuild Inject new code using LLDB Command 

LLDB Code Injection - Example Goal: Inject new view model to asynchronously download 

LLDB Code Injection - Example 1. Insert breakpoint, enter multi-line expression mode 

LLDB Code Injection - Example 2. Inject new view model code 

LLDB Code Injection - Example 3. Execute the injected function 

LLDB Code Injection - Example 4. Wait the async task to complete. Retrigger the breakpoint, check result & Done. 

Framework Code Injection Preview Summary 

Reduce Number of Times
 To Rebuild Whole App 

Thank You