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
20250307_エンジニアじゃないけどAzureはじめてみた
ponponmikankan
2
130
手を動かしてレベルアップしよう!
maruto
0
250
【Snowflake九州ユーザー会#2】BigQueryとSnowflakeを比較してそれぞれの良し悪しを掴む / BigQuery vs Snowflake: Pros & Cons
civitaspo
2
440
JAWS FESTA 2024「バスロケ」GPS×サーバーレスの開発と運用の舞台裏/jawsfesta2024-bus-gps-serverless
ma2shita
3
340
RayでPHPのデバッグをちょっと快適にする
muno92
PRO
0
200
エンジニア主導の企画立案を可能にする組織とは?
recruitengineers
PRO
1
310
クラウド食堂とは?
hiyanger
0
130
Log Analytics を使った実際の運用 - Sansan Data Hub での取り組み
sansantech
PRO
0
110
4th place solution Eedi - Mining Misconceptions in Mathematics
rist
0
150
Snowflake ML モデルを dbt データパイプラインに組み込む
estie
0
110
AI自体のOps 〜LLMアプリの運用、AWSサービスとOSSの使い分け〜
minorun365
PRO
9
1k
ExaDB-XSで利用されているExadata Exascaleについて
oracle4engineer
PRO
3
300
Featured
See All Featured
Principles of Awesome APIs and How to Build Them.
keavy
126
17k
CoffeeScript is Beautiful & I Never Want to Write Plain JavaScript Again
sstephenson
160
15k
Building Flexible Design Systems
yeseniaperezcruz
328
38k
StorybookのUI Testing Handbookを読んだ
zakiyama
28
5.5k
Git: the NoSQL Database
bkeepers
PRO
428
65k
How STYLIGHT went responsive
nonsquared
99
5.4k
Measuring & Analyzing Core Web Vitals
bluesmoon
6
260
How to Ace a Technical Interview
jacobian
276
23k
Building Better People: How to give real-time feedback that sticks.
wjessup
367
19k
Code Reviewing Like a Champion
maltzj
521
39k
The Language of Interfaces
destraynor
156
24k
Unsuck your backbone
ammeep
669
57k
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