Dem Fehler auf der Spur - Mobile Testing Days 2015

Eine Expedition in die (Objective-C) Debugging Toolchain von iOS.
Talk gehalten auf den Mobile Testing Days in Berlin am 28. Mai 2015.

Transcript

1. Dem Fehler auf der Spur
2. Florian Bürger @florianbuerger
4. keslcod Better software for happier humans
5. — Denkweise — Debugging — Profiling
6. Denkweise
7. Incident Identifier: 63569671-4940-4162-B76F-D3AD44A607F0 CrashReporter Key: 09B60E97-4A43-4092-8C6A-51B4406BE34A Hardware Model: iPhone6,2 Process: App [268] Path: /private/var/mobile/Containers/Bundle/Appl Identifier: de.inhofer.app.beta Version: 101 Code Type: ARM-64 Parent Process: launchd [1] Date/Time: 2014-09-23T15:03:07Z OS Version: iPhone OS 8.0 (12A365) Report Version: 104 Exception Type: SIGABRT Exception Codes: #0 at 0x197c73270 Crashed Thread: 0 Application Specific Information: *** Terminating app due to uncaught exception 'NSInvalidArg …
8. Panik Ruhig atmen Title Text
9. keine Panik!
10. ruhig atmen!
11. Mentales Modell
12. Ziel?
13. 100% Verständnis
14. 100% Verständnis Fremder Code!
15. “Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it.” —Brian Kernighan
16. seid klug, schreibt stupiden Code
17. - (BOOL)isLogoHiddenAtIndexPath:(id)p { return ![self URLAtIndexPath:p]; }
18. - (BOOL)isLogoHiddenAtIndexPath:(id)p { NSURL *logoURL = [self URLAtPath:p]; BOOL hidden = (logoURL != nil); return hidden; }
19. - (BOOL)isLogoHiddenAtIndexPath:(id)p { NSURL *logoURL = [self URLAtPath:p]; BOOL hidden = (logoURL != nil); return hidden; }
20. - (id)calculateWithThing:(Thing *)t { return [self doCalculation: [self calcForThing:t] withOtherThing: [self otherThing]; }
21. - (id)calculateWithThing:(Thing *)t { return [self doCalculation: [self calcForThing:t] withOtherThing: [self otherThing]; }
22. - (id)calculateWithThing:(Thing *)t { return [self doCalculation: [self calcForThing:t] withOtherThing: [self otherThing]; }
23. - (id)calculateWithThing:(Thing *)t { return [self doCalculation: [self calcForThing:t] withOtherThing: [self otherThing]; }
24. Lokale Variablen
25. - (id)calculateWithThing:(Thing *)t { Calc* calc = [self calcForThing:t]; Thing *other = [self otherThing]; Result *result = [self doCalculation:calc withOtherThing:other]; return result; }
26. - (id)calculateWithThing:(Thing *)t { Calc* calc = [self calcForThing:t]; Thing *other = [self otherThing]; Result *result = [self doCalculation:calc withOtherThing:other]; return result; }
27. - (id)calculateWithThing:(Thing *)t { Calc* calc = [self calcForThing:t]; Thing *other = [self otherThing]; Result *result = [self doCalculation:calc withOtherThing:other]; return result; }
28. - (id)calculateWithThing:(Thing *)t { Calc* calc = [self calcForThing:t]; Thing *other = [self otherThing]; Result *result = [self doCalculation:calc withOtherThing:other]; return result; }
29. Guidelines einhalten
30. travisjeffery/ ClangFormat-Xcode haaakon/Apple- clang-format
31. Und was ist mit Swift?
32. SwiftLint
33. realm/SwiftLint
35. — Class implements isEqual: but not hash — Fixed-format NSDateFormatter not using invariant (POSIX) locale
36. Denkweise Fehler passieren
37. Denkweise 100% Verständnis
38. Denkweise Simpler Code
39. Debugging
41. Debug Navigator
43. Variables View
45. Console
47. Alle Breakpoints de-/aktivieren
48. Pause/Continue
49. Step over
50. Step into
51. Step out
52. View hierarchy
53. Location
54. Bedingte Breakpoints
56. Breakpoint Commands
62. Demo
63. Breakpoints teilen
64. im Projekt Versions kontrolle
65. im Projekt Kollegen
66. im User Account für jedes Projekt!
69. +++ b/Test.xcodeproj/xcshareddata/xcdebugger/ Breakpoints_v2.xcbkptlist @@ -2,4 +2,22 @@ <Bucket type = "4" version = "2.0"> + <Breakpoints> + <BreakpointProxy + BreakpointExtensionID = "Xcode.Breakpoint.FileBreakpoint"> + <BreakpointContent + shouldBeEnabled = "Yes" + ignoreCount = "0" + continueAfterRunningActions = "No" + filePath = "Test/ViewController.swift" + timestampString = "454418607.219209" + startingColumnNumber = "9223372036854775807" + endingColumnNumber = "9223372036854775807" + startingLineNumber = "15" + endingLineNumber = "15" + landmarkName = "viewDidLoad()"
70. +++ b/Test.xcodeproj/xcshareddata/xcdebugger/Breakpoints_v2.xcbkptlist @@ -2,4 +2,22 @@ <Bucket type = "4" version = "2.0"> + <Breakpoints> + <BreakpointProxy + BreakpointExtensionID = "Xcode.Breakpoint.FileBreakpoint"> + <BreakpointContent + <Actions> + <BreakpointActionProxy> + ActionExtensionID = “Xcode.BreakpointAction.Log"> + <ActionContent + message = "Hello Mobile Testing Days" + conveyanceType = "0"> + </ActionContent> + </BreakpointActionProxy> + </Actions>
71. LLDB
72. NSString *foo = @“foo” (lldb) po foo
73. NSString *foo = @“foo” (lldb) po foo foo
74. NSString *foo = @“foo” (lldb) expr [foo stringByAppendString:@“bar”]
75. NSString *foo = @“foo” (lldb) expr [foo stringByAppendString:@“bar”] (id) $1 = 0x7b242670
76. NSString *foo = @“foo” (lldb) expr [foo stringByAppendString:@“bar”] (id) $1 = 0x7b242670 (lldb) po 0x7b242670
77. NSString *foo = @“foo” (lldb) expr [foo stringByAppendString:@“bar”] (id) $1 = 0x7b242670 (lldb) po 0x7b242670 foobar
78. (lldb) po self.view.frame
79. (lldb) po self.view.frame error: property 'frame' not found on object of type 'UIView *' error: 1 errors parsing expression
80. (lldb) po self.view.window nil (lldb) po self.view.frame error: property 'frame' not found on object of type 'UIView *' error: 1 errors parsing expression (lldb) expr @import UIKit
81. (lldb) po self.view.frame (origin = (x = 0, y = 0), size = (width = 320, height = 568)) (origin = (x = 0, y = 0), size = (width = 320, height = 568))
82. Quick Look
85. .lldbinit
86. chisel
87. presponder Print the responder chain starting from the given object.
88. mask/unmask Overlay a view or layer with a transparent rectangle to visualize where it is.
89. Logging
90. NSLog()?
91. NSLog()
92. Logging mit Breakpoints
94. Cocoa Lumber- jack
95. — Schnell(er) — Flexibel — Dynamisch
96. — Schnell(er) — Flexibel — Dynamisch
97. — Schnell(er) — Flexibel — Dynamisch
98. Schemes
99. — Launch Arguments — Location — Application Data — Background Fetch — Localization
100. Demo
102. System Argumente
103. -com.apple.CoreData. ConcurrencyDebug 1
104. Eigene Argumente
105. -> NSUserDefaults
106. -recording-disabled 1 -use-local-server 0 [NSUserDefaults standardUserDefaults] boolForKey:@"recording-enabled"];
107. -recording-disabled 1 -use-local-server 0 [NSUserDefaults standardUserDefaults] boolForKey:@"recording-enabled"];
108. — Launch Arguments — Location — Application Data — Background Fetch — Localization
109. <?xml version="1.0" encoding="UTF-8" standalone="no"?> <gpx xmlns="http://www.topografix.com/GPX/1/1" xmlns:xsi="http://www.w3.org/2001/ XMLSchema-instance" xsi:schemaLocation="http:// www.topografix.com/GPX/1/1 http:// www.topografix.com/GPX/1/1/gpx.xsd" version="1.1" <wpt lat="52.509678" lon="13.399576"> <time>2015-05-27T19:29:40Z</time> </wpt> </gpx>
111. — Launch Arguments — Location — Application Data — Background Fetch — Localization
113. iOS 8 rdar://20622011
114. Quick Radar
115. — Launch Arguments — Location — Application Data — Background Fetch — Localization
116. — Launch Arguments — Location — Application Data — Background Fetch — Localization
118. View Debugging
120. — Constraints — Bounds — Hierarchie — Read-Only…
121. — Constraints — Bounds — Hierarchie — Read-Only…
122. — Constraints — Bounds — Hierarchie — Read-Only…
123. — Constraints — Bounds — Hierarchie — Read-Only…
124. Reveal
125. Demo
128. Spark Inspector
130. Wo ist meine App?
131. Sim Pholders2
132. Sim Pholders2
133. Debugging Logging ohne NSLog()
134. Debugging Breapoints +Commands
135. Debugging Launch Arguments
136. Debugging Visuelles Debuggen
137. Debugging Fehler verstehen
138. Profiling
139. Vermuten
140. Vermuten Wissen
143. Was dauert so lange?
146. 60 FPS
147. 60 FPS
148. 60 FPS
149. Demo
150. Profiling Wissen! Vermuten
151. Profiling Instruments
152. Profiling 60 FPS
153. Links - lldb-command-examples - LLDB-QuickLook - chisel - CocoaLumberjack - NSLogger - NSLogger-CocoaLumberjack-connector - Reveal - Spark Inspector
154. Links - Symbolic breakpoint for sychronous network call on main thread - SimPholders - ClangFormat-Xcode - Apple-clang-format - SwiftLint - Faux Pas
155. Be smart write stupid code