Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Debugging in Swift
Search
Carola Nitz
March 22, 2015
Technology
19
23k
Debugging in Swift
This talk will give you some helpful tips and tricks when you struggle with Debugging
Carola Nitz
March 22, 2015
Tweet
Share
More Decks by Carola Nitz
See All by Carola Nitz
Beware of the legacy! The one you inherit and the one you create
carola
0
210
Debugging - Things your senior hasn't told you about
carola
6
1.9k
Code Snippets for Debugging
carola
1
270
Other Decks in Technology
See All in Technology
シークレット管理だけじゃない!HashiCorp Vault でデータ暗号化をしよう / Beyond Secret Management! Let's Encrypt Data with HashiCorp Vault
nnstt1
3
130
Browser
recruitengineers
PRO
8
2.2k
Snowflakeの生成AI機能を活用したデータ分析アプリの作成 〜Cortex AnalystとCortex Searchの活用とStreamlitアプリでの利用〜
nayuts
0
150
生成AI時代のデータ基盤設計〜ペースレイヤリングで実現する高速開発と持続性〜 / Levtech Meetup_Session_2
sansan_randd
1
110
なぜSaaSがMCPサーバーをサービス提供するのか?
sansantech
PRO
6
1.8k
allow_retry と Arel.sql / allow_retry and Arel.sql
euglena1215
1
150
Grafana MCPサーバーによるAIエージェント経由でのGrafanaダッシュボード動的生成
hamadakoji
1
1.1k
AWSで推進するデータマネジメント
kawanago
0
870
「魔法少女まどか☆マギカ Magia Exedra」での負荷試験の実践と学び
gree_tech
PRO
0
450
ここ一年のCCoEとしてのAWSコスト最適化を振り返る / CCoE AWS Cost Optimization devio2025
masahirokawahara
1
1.3k
実践アプリケーション設計 ②トランザクションスクリプトへの対応
recruitengineers
PRO
4
1.2k
Automating Web Accessibility Testing with AI Agents
maminami373
0
460
Featured
See All Featured
Designing for Performance
lara
610
69k
Speed Design
sergeychernyshev
32
1.1k
Designing Dashboards & Data Visualisations in Web Apps
destraynor
231
53k
Measuring & Analyzing Core Web Vitals
bluesmoon
9
570
Learning to Love Humans: Emotional Interface Design
aarron
273
40k
Creating an realtime collaboration tool: Agile Flush - .NET Oxford
marcduiker
31
2.2k
Into the Great Unknown - MozCon
thekraken
40
2k
It's Worth the Effort
3n
187
28k
Chrome DevTools: State of the Union 2024 - Debugging React & Beyond
addyosmani
7
830
Sharpening the Axe: The Primacy of Toolmaking
bcantrill
44
2.5k
Templates, Plugins, & Blocks: Oh My! Creating the theme that thinks of everything
marktimemedia
31
2.5k
How to train your dragon (web standard)
notwaldorf
96
6.2k
Transcript
Debugging in Swift how hard can it be @_Caro _N,
22/3/2015
Why do we struggle with debugging? @_Caro _N, 22/3/2015
Output is not helpful (lldb) po objectiveCString 0x00007fbaa1f24910 (ObjectiveC.NSObject =
{}) @_Caro _N, 22/3/2015
Error messages make no sense @_Caro _N, 22/3/2015
What?! That tool exists? @_Caro _N, 22/3/2015
How debugging should be like • Get to the content
of interest @_Caro _N, 22/3/2015
How debugging should be like • Get to the content
of interest • Get helpful error messages @_Caro _N, 22/3/2015
How debugging should be like • Get to the content
of interest • Get helpful error messages • Display additional information where needed @_Caro _N, 22/3/2015
How debugging should be like • Get to the content
of interest • Get helpful error messages • Display additional information where needed • Know about debugging tools @_Caro _N, 22/3/2015
LLDB @_Caro _N, 22/3/2015
Expression (lldb) po objectiveCString 0x00007fbaa1f24910 (ObjectiveC.NSObject = {}) @_Caro _N,
22/3/2015
Expression (lldb) expression -O -- objectiveCString 0x00007fbaa1f24910 (ObjectiveC.NSObject = {})
@_Caro _N, 22/3/2015
Magic command (lldb) expression -l objc -O -- (id) 0x00007fbaa1f24910
@_Caro _N, 22/3/2015
Magic command (lldb) expression -l objc -O -- (id) 0x00007fbaa1f24910
I'm a fancy Objective-C String @_Caro _N, 22/3/2015
Breakpoints @_Caro _N, 22/3/2015
Editing Breakpoints @_Caro _N, 22/3/2015
Editing Breakpoints @_Caro _N, 22/3/2015
Editing Breakpoints @_Caro _N, 22/3/2015
Projectwide Breakpoints • Catch Objective-C or C++ Exceptions on throw
or catch @_Caro _N, 22/3/2015
Projectwide Breakpoints • Catch Objective-C or C++ Exceptions on throw
or catch @_Caro _N, 22/3/2015
Projectwide Breakpoints • Catch Objective-C or C++ Exceptions on throw
or catch • Catch OpenGL ES errors @_Caro _N, 22/3/2015
Projectwide Breakpoints • Catch Objective-C or C++ Exceptions on throw
or catch • Catch OpenGL ES errors • Stop when executing a specific function or method @_Caro _N, 22/3/2015
Projectwide Breakpoints • Catch Objective-C or C++ Exceptions on throw
or catch • Catch OpenGL ES errors • Stop when executing a specific function or method • Stop when test Assertions fail @_Caro _N, 22/3/2015
Symbolic Breakpoints @_Caro _N, 22/3/2015
Symbolic Breakpoints @_Caro _N, 22/3/2015
Compiler errors @_Caro _N, 22/3/2015
Approach? @_Caro _N, 22/3/2015
1. Remove variables @_Caro _N, 22/3/2015
2. Split instructions @_Caro _N, 22/3/2015
Add return type @_Caro _N, 22/3/2015
Launch arguments @_Caro _N, 22/3/2015
Adding arguments in the scheme editor @_Caro _N, 22/3/2015
Concurrency -com.apple.CoreData.ConcurrencyDebug 1 @_Caro _N, 22/3/2015
SQL Statements -com.apple.CoreData.SQLDebug 3 @_Caro _N, 22/3/2015
Many more -com.apple.CoreData.MigrationDebug -com.apple.CoreData.SQLiteDebugSynchronous [0,1,2] -com.apple.CoreData.SQLiteIntegrityCheck 1 -com.apple.CoreData.ThreadingDebug [1,2,3] http://matthewmorey.com/tools-for-core-data/
@_Caro _N, 22/3/2015
Localization • -NSDoubleLocalizedStrings 1 @_Caro _N, 22/3/2015
Localization • -NSDoubleLocalizedStrings 1 • -NSShowNonLocalizedStrings 1 @_Caro _N, 22/3/2015
Localization • -NSDoubleLocalizedStrings 1 • -NSShowNonLocalizedStrings 1 • -AppleLanguages (es
de) Technical Note TN2239 iOS Debugging Magic @_Caro _N, 22/3/2015
Debugging tools @_Caro _N, 22/3/2015
Charles • Debug http/https requests • Throttle traffic • Record
download statistics @_Caro _N, 22/3/2015
Swift REPL • Test and interact with your app •
Add new code • Clean slate xcrun swift in the terminal @_Caro _N, 22/3/2015
Activity Tracing Trace crashes in asynchonous code os_activity_t activity =
os_activity_start("activity name", OS_ACTIVITY_FLAG_DEFAULT); // [...] os_activity_set_breadcrumb("event description"); // [...] os_trace("Received %d creates, %d updates, %d deletes", created, updated, deleted); // [...] os_activity_end(activity); @_Caro _N, 22/3/2015
Activity Tracing @_Caro _N, 22/3/2015
Activity Tracing http://www.objc.io/issue-19/activity-tracing.html @_Caro _N, 22/3/2015
Summary • expression -l objc -O -- (id) 0x00007fbaa1f24910 •
Edit Breakpoints, add symbolic and exception breakpoints • Tackle incomprehensive compiler errors • Launch arguments • Charles, REPL, Activity tracing @_Caro _N, 22/3/2015
Thanks @_Caro _N, 22/3/2015