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
200
Debugging - Things your senior hasn't told you about
carola
6
1.8k
Code Snippets for Debugging
carola
1
260
Other Decks in Technology
See All in Technology
障害対応をちょっとずつよくしていくための 演習の作りかた
heleeen
0
140
AWSに詳しくない人でも始められるコスト最適化ガイド
yuhta28
0
190
私が trocco を推す理由
__allllllllez__
1
210
プラットフォームってつくることより計測することが重要なんじゃないかという話 / Platform Engineering Meetup #8
taishin
1
350
複雑な構成要素を持つUIとの向き合い方 〜新・支出グラフでの実例〜 / B43 TECH TALK
nakamuuu
0
140
生産性向上チームの紹介
cybozuinsideout
PRO
1
870
SIEMを用いて、セキュリティログ分析の可視化と分析を実現し、PDCAサイクルを回してみた
coconala_engineer
0
280
Compose Compiler Metricsを使った実践的なコードレビュー
tomorrowkey
1
220
Gitlab本から学んだこと - そーだいなるプレイバック / gitlab-book
soudai
3
130
KubeConにproposalを送りたい人へのアドバイス
sat
PRO
3
240
開発生産性向上サービスを作るFindyが自分たちで開発生産性を爆上げした組織づくりの歩み / Findy's path to boosting its own development productivity 2024-04-17
ma3tk
3
650
開発生産性大幅アップ!Postman VS Code拡張機能
nagix
2
370
Featured
See All Featured
Music & Morning Musume
bryan
41
5.6k
Optimizing for Happiness
mojombo
370
69k
Learning to Love Humans: Emotional Interface Design
aarron
267
39k
Easily Structure & Communicate Ideas using Wireframe
afnizarnur
187
16k
jQuery: Nuts, Bolts and Bling
dougneiner
59
7.1k
Why Our Code Smells
bkeepers
PRO
331
56k
The Brand Is Dead. Long Live the Brand.
mthomps
49
28k
What's in a price? How to price your products and services
michaelherold
237
11k
From Idea to $5000 a Month in 5 Months
shpigford
377
45k
A Modern Web Designer's Workflow
chriscoyier
689
190k
Robots, Beer and Maslow
schacon
PRO
155
7.9k
Designing with Data
zakiwarfel
96
4.8k
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