Dubugging Tips and Tricks for iOS development

Transcript

1. Elvis Lin 2020/07/31 Debugging Tips and Tricks How to (possibly) reduce the time of debugging
2. Debugging Know the current state Update the state without re-compiling Modify device or environment without re-launching
3. Know The Current State
4. Add a Breakpoint •Click the line to add a breakpoint •Edit the breakpoint to add a condition if it’s necessary
5. Add a Watchpoint •Pause while the watched variable is changed •Steps: •Right click on a variable 
 in Debug Area •Select “Watch <name>”
6. LLDB Print Commands Command Alias For Steps To Evaluate po <expression> expression —-object-description —- <expression> 1. Expression: evaluate <expression> 2. Expression: debug description p <expression> expression —- <expression> 1. Expression: evaluate <expression> 2. Outputs LLDB-formatted description v <name> frame variable <name> 1. Reads value of <name> from memory 2. Outputs LLDB-formatted description
11. Update The State 
 Without Re-compiling
12. Execute Expressions •expr <expression>
13. Skip The Current Expression •thread jump —by 1
14. Execute Expressions in a Breakpoint
15. Modify Device or Environment Without Re-launching
16. Switch Between Dark And Light mode •Simulator: Features -> Toggle Appearance •Xcode: Environment Overrides -> Interface Style
17. Change Font Size •Xcode: Environment Overrides -> Text
18. Slow Animation •Simulator: Debug -> Slow Animation
19. Reference •Advanced Debugging with Xcode and LLDB •Debugging in Xcode 11 •LLDB: Beyond "po"