Advanced iOS debbuging
Upcoming SlideShare
Loading in...5
×
 

Advanced iOS debbuging

on

  • 1,851 views

The debug process constitutes an important part in an app's development cycle. Knowing the (right) tools and techniques means you can optimizes time and therefore costs. In this session we will see a ...

The debug process constitutes an important part in an app's development cycle. Knowing the (right) tools and techniques means you can optimizes time and therefore costs. In this session we will see a number of techniques to optimize debugging of iOS applications exploiting the power of Xcode, LLDB and other support tools.

Statistics

Views

Total Views
1,851
Views on SlideShare
1,840
Embed Views
11

Actions

Likes
9
Downloads
75
Comments
0

3 Embeds 11

http://rome.codemotionworld.com 7
http://www.linkedin.com 3
https://www.linkedin.com 1

Accessibility

Categories

Upload Details

Uploaded via as Adobe PDF

Usage Rights

© All Rights Reserved

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Processing…
Post Comment
Edit your comment

Advanced iOS debbuging Advanced iOS debbuging Presentation Transcript

  • Massimo OlivieroAdvanced iOS Debuggingmassimo.oliviero@gmail.com @maxoly #code12
  • Massimo Oliviero Massimo Oliviero - massimo.oliviero@gmail.com - www.massimooliviero.net - @maxolyFreelance Software DeveloperCo-founder of #pragma mark http://pragmamark.orgOnline web http://www.massimooliviero.net email massimo.oliviero@gmail.com twitter @maxoly slide http://www.slideshare.net/MassimoOliviero
  • Agenda Massimo Oliviero - massimo.oliviero@gmail.com - www.massimooliviero.net - @maxoly• Code, some tips for standard functions• Xcode, the best tools for debugging• LLDB, your great friend• Tools, network debugging how to and more• Remote, over the air debugging
  • Advanced iOS Debugging Code
  • It all began... Massimo Oliviero - massimo.oliviero@gmail.com - www.massimooliviero.net - @maxoly NSLog(@"Array %@", array);NSLog(@"URL: %@", url); NSLog(@"User: %@", user); NSLog(@"Array: %@", array); NSLog(@"User: NSLog(@"User: %@", user); NSLog(@"URL: %@", url); NSLog(@"User: %@", user); NSLog(@"User: %@", user); NSLog(@"User: %@", user); NSLog(@"Error :( %@", error); NSLog(@"Error :( %@", error); NSLog(@"User %@", NSLog(@"Count: %i", count); user); NSLog(@"Array: %@", array); NSLog(@"Error :( %@", NSLog(@"User: %@", user); NSLog(@"User: %@", user); error
  • NSLog Massimo Oliviero - massimo.oliviero@gmail.com - www.massimooliviero.net - @maxoly• It prints debugs output only to the console• It’s a simple native Foundation function• It’s not too bad, but It’s an ancient technique• It slows things down considerably (if not handled)
  • NSLog optimization Massimo Oliviero - massimo.oliviero@gmail.com - www.massimooliviero.net - @maxoly• Use convenient macro• Use string conversions• Try alternative frameworks
  • NSLog macro Massimo Oliviero - massimo.oliviero@gmail.com - www.massimooliviero.net - @maxolyMyGreatApp-prefix.pch#if defined DEBUG#define MYNSLog(s, ...) NSLog((@"%s [Line %d] " s), __PRETTY_FUNCTION__,__LINE__, ##__VA_ARGS__)#else #define MYNSLog(s, ...)#endifTestViewController.m- (void)viewDidLoad{ [super viewDidLoad]; MYNSLog(@"message");}Console-[TestViewController viewDidLoad] [Line 33] message
  • NSLog macro Massimo Oliviero - massimo.oliviero@gmail.com - www.massimooliviero.net - @maxoly• Enables DEBUG mode output only• Outputs function name and line number• Place macro into .pch file or in a header file• You can use other macros like __ FILE__ (for example)
  • String conversion functions Massimo Oliviero - massimo.oliviero@gmail.com - www.massimooliviero.net - @maxolyAdvanceDebuggingExample.mCGPoint point = CGPointMake(10.5f, 12.3f);NSLog(@"point: %@", NSStringFromCGPoint(point));ConsoleAdvanceDebuggingExample[3050:c07] point: {10.5, 12.3}
  • String conversion functions Massimo Oliviero - massimo.oliviero@gmail.com - www.massimooliviero.net - @maxolyReturns a string formatted to contain the data from astructure: • NSStringFromCGAffineTransform • NSStringFromCGPoint • NSStringFromCGRect • NSStringFromCGSize • NSStringFromUIEdgeInsets • NSStringFromUIOffset
  • Try alternative frameworks Massimo Oliviero - massimo.oliviero@gmail.com - www.massimooliviero.net - @maxoly• CocoaLumberjack https://github.com/robbiehanson/CocoaLumberjack• NSLogger https://github.com/fpillet/NSLogger• DMLogger https://github.com/malcommac/DMLogger
  • Advanced iOS Debugging Demo
  • Advanced iOS Debugging Xcode
  • Xcode Massimo Oliviero - massimo.oliviero@gmail.com - www.massimooliviero.net - @maxoly• Configure your Behaviors• Print more information with Arguments• Go beyond logging with Breakpoints
  • Advanced iOS Debugging Behaviors
  • Xcode default Behaviors Debugger bar
  • Xcode default BehaviorsDebuggerNavigator Variables View Console
  • Xcode Behaviors Massimo Oliviero - massimo.oliviero@gmail.com - www.massimooliviero.net - @maxoly• Match Xcode to your Workflow• Use Behaviors to control Xcode• Behaviors lets you specify what should happen when a variety of events occur (like Run)
  • Behaviors Show Debug NavigatorWhen Show debugger viewspauses
  • Change default Behavior Massimo Oliviero - massimo.oliviero@gmail.com - www.massimooliviero.net - @maxolyFor example, when Running pauses:• show the Breakpoint Navigator instead of Debug Navigator• show only Variable Views• open another tab only with Console view
  • Advanced iOS Debugging Demo
  • Advanced iOS Debugging Arguments
  • ArgumentsProduct > Scheme > Edit Scheme > Arguments
  • Core Data Logging-com.apple.CoreData.SQLDebug 1
  • Core Data and iCloud-com.apple.coredata.ubiquity.logLevel 3
  • Advanced iOS Debugging Breakpoints
  • Creating and editing breakpoint
  • Breakpoint Navigator
  • Exception Breakpoint
  • Symbolic Breakpoint
  • Breakpoint Action
  • Breakpoint actionCondition to evaluateThe num of time to ignorebreakpoint before stopingLog Message ActionDebugger Command ActionPlay soundContinue program execution
  • Debugger Command Action po variable expr (void)NSLog(@”variable: %@”, variable)breakpoint set -f ADEMasterViewController.m -l 83
  • Sharing BreakpointShare breakpoints with the team, so that all can benefit from it This action will create a new directory to be committed in the repository AdvanceDebuggingExample.xcodeproj/xcshareddata/
  • Advanced iOS Debugging Demo
  • Advanced iOS Debugging LLDB
  • Why LLDB Massimo Oliviero - massimo.oliviero@gmail.com - www.massimooliviero.net - @maxoly• Consistent Command Syntax• Scriptability with Python• Performance• ...
  • LLDB Commands Massimo Oliviero - massimo.oliviero@gmail.com - www.massimooliviero.net - @maxoly (lldb) <command>print object po [object]print variable print [variable]assign value expr [variable] = [value]
  • LLDB Commands Massimo Oliviero - massimo.oliviero@gmail.com - www.massimooliviero.net - @maxoly<noun> <verb> [-options [option-value]] [argument [argument...]] set breakpoint breakpoint set -f [file] -l [line] load script command script import ~/test.pyevaluate expression expr <expression>
  • Custom object, the problemCustom object@interface ADEEvent : NSObject@property (nonatomic, strong) NSString *title;@property (nonatomic, strong) NSDate *when; Init object ADEEvent *event = [[ADEEvent alloc] init];@end event.title = @"Codemotion Conference"; event.when = [NSDate date]; No summary for custom object
  • Custom summary Massimo Oliviero - massimo.oliviero@gmail.com - www.massimooliviero.net - @maxoly• Create a Python script that will instruct LLDB on how to display a summary of your custom object• Load your Python script via command line or ~/.lldbinit file
  • Custom summary Massimo Oliviero - massimo.oliviero@gmail.com - www.massimooliviero.net - @maxolyimport lldbdef ade_summary(valobj, internal_dict):! titleAsString = valobj.GetChildMemberWithName(_title).GetSummary()! whenAsString = valobj.GetChildMemberWithName(_when).GetSummary()! return Title: + titleAsString + - when: + whenAsStringdef __lldb_init_module(debugger, dict): debugger.HandleCommand(type summary add ADEEvent -F CustomSummaries1.ade_summary) • Create “ADEEvent_summary.py” in Xcode project • Then load script: (lldb) command script import /path/to/ADEEvent_summary.py
  • Console tips Massimo Oliviero - massimo.oliviero@gmail.com - www.massimooliviero.net - @maxoly(lldb) po [self.view recursiveDescription]$7 = 0x082a2c60 <UITableView: 0x8971000; frame = (0 0; 320 504); clipsToBounds = YES; autoresize = W+H;gestureRecognizers = <NSArray: 0x8184be0>; layer = <CALayer: 0x8184570>; contentOffset: {0, 0}> | <UITableViewCell: 0x8282900; frame = (0 176; 320 44); text = 2013-03-12 21:22:34 +0000; autoresize = W;layer = <CALayer: 0x8282a30>> | | <UITableViewCellContentView: 0x8282a60; frame = (0 0; 300 43); gestureRecognizers = <NSArray:0x8282c30>; layer = <CALayer: 0x8282ac0>> | | | <UILabel: 0x8282e50; frame = (10 0; 280 43); text = 2013-03-12 21:22:34 +0000; clipsToBounds= YES; userInteractionEnabled = NO; layer = <CALayer: 0x8282ee0>> | | <UIButton: 0x8282c80; frame = (290 0; 30 43); opaque = NO; userInteractionEnabled = NO; layer = ...(lldb) po [[UIWindow keyWindow] recursiveDescription]$5 = 0x08273bc0 <UIWindow: 0x8181010; frame = (0 0; 320 568); layer = <UIWindowLayer: 0x81810e0>> | <UILayoutContainerView: 0xd06eed0; frame = (0 0; 320 568); autoresize = W+H; layer = <CALayer:0xd071460>> | | <UINavigationTransitionView: 0xd09e850; frame = (0 0; 320 568); clipsToBounds = YES; autoresize = W+H; layer = <CALayer: 0xd09e920>> | | | <UIViewControllerWrapperView: 0x846e160; frame = (0 64; 320 504); autoresize = W+H; layer =<CALayer: 0x846e210>>...
  • Advanced iOS Debugging Demo
  • Advanced iOS Debugging Tools
  • Tools Massimo Oliviero - massimo.oliviero@gmail.com - www.massimooliviero.net - @maxoly• Network Link Conditioner• Charles• PonyDebugger• Deploymate
  • Network Link Conditioner Massimo Oliviero - massimo.oliviero@gmail.com - www.massimooliviero.net - @maxoly• It’s a utility that enables you to simulate network conditions• To install just select Xcode > Open Developer Tool > More Developer Tools.You’ll be taken to Apple’s developer downloads site• Download “Hardware IO Tools for Xcode”
  • Network Link Conditioner
  • Charles Massimo Oliviero - massimo.oliviero@gmail.com - www.massimooliviero.net - @maxoly http://www.charlesproxy.com/• It’s a web debugging proxy• You can inspect, modify and record requests & responses• SSL Proxing (http://www.charlesproxy.com/ documentation/faqs/ssl-connections-from-within-iphone- applications/)
  • Charles
  • PonyDebugger Massimo Oliviero - massimo.oliviero@gmail.com - www.massimooliviero.net - @maxoly https://github.com/square/PonyDebugger• Network Traffic Debugger• Core Data Browser• It is a client library and gateway server combination that uses Chrome Developer Tools on your browser to debug your applications network traffic and managed object contexts.
  • PonyDebugger
  • Deploymate Massimo Oliviero - massimo.oliviero@gmail.com - www.massimooliviero.net - @maxoly• If using an API introduced later than your target OS but your app is targeting an older OS version, Xcode doesnt warn you about it• It helps identify unavailable, deprecated and obsolete API
  • Deploymate
  • Advanced iOS Debugging Demo
  • Advanced iOS Debugging Remote
  • Remote debugging Massimo Oliviero - massimo.oliviero@gmail.com - www.massimooliviero.net - @maxoly• Apple Crash Reports• PLCrashReporter• TestFlight
  • Advanced iOS DebuggingApple Crash Reports
  • Apple Crash Reports Massimo Oliviero - massimo.oliviero@gmail.com - www.massimooliviero.net - @maxoly https://itunesconnect.apple.com• For app published on App Store, you can acquire crash log from iTunes Connect and import it into Organizer for symbolication• To symbolicate a crash log, Xcode needs to have access to the matching application binary that was uploaded to the App Store, and the .dSYM file that was generated when that binary was built. This must be an exact match
  • Apple Crash Reports
  • Apple Crash Reports
  • Xcode Symbolication
  • Advanced iOS DebuggingPLCrashReporter
  • PLCrashReporter Massimo Oliviero - massimo.oliviero@gmail.com - www.massimooliviero.net - @maxoly https://code.google.com/p/plcrashreporter/• In-process CrashReporter framework for the iPhone and Mac OS X• Handles both uncaught Objective-C exceptions and fatal signals• Backtraces for all active threads are provided
  • Massimo Oliviero - massimo.oliviero@gmail.com - www.massimooliviero.net - @maxoly- (void) handleCrashReport { PLCrashReporter *crashReporter = [PLCrashReporter sharedReporter]; NSData *crashData; NSError *error; // Try loading the crash report crashData = [crashReporter loadPendingCrashReportDataAndReturnError: &error]; if (crashData == nil) { NSLog(@"Could not load crash report: %@", error); goto finish; } PLCrashReport *report = [[[PLCrashReport alloc] initWithData: crashData error: &error] autorelease]; if (report == nil) { NSLog(@"Could not parse crash report"); goto finish; } .... return;}// from UIApplicationDelegate protocol- (void) applicationDidFinishLaunching: (UIApplication *) application { PLCrashReporter *crashReporter = [PLCrashReporter sharedReporter]; NSError *error; // Check if we previously crashed if ([crashReporter hasPendingCrashReport]) [self handleCrashReport]; // Enable the Crash Reporter if (![crashReporter enableCrashReporterAndReturnError: &error]) NSLog(@"Warning: Could not enable crash reporter: %@", error);}
  • Advanced iOS Debugging TestFlight
  • TestFlight Massimo Oliviero - massimo.oliviero@gmail.com - www.massimooliviero.net - @maxoly https://testflightapp.com/• Invite your testers, drop in the SDK and start uploading your builds.• Upload your builds and TestFlight takes care of the rest. Painless over-the-air distribution to your testers and distribution lists.• Complete tracking of your build, from distribution to sessions, checkpoints and crashes.
  • TestFlight Apps Managment
  • TestFlight Crashes
  • Advanced iOS DebuggingFinal Thoughts
  • Final Thoughts Massimo Oliviero - massimo.oliviero@gmail.com - www.massimooliviero.net - @maxoly• Don’t use NSLog anymore ;)• Create your Xcode Behaviors• Breakpoints are your friends• LLDB is a promising youngster• Tools can save your life• The QA phase is essential
  • Advanced iOS Debugging Thank you! Massimo Oliviero massimo.oliviero@gmail.com http://www.massimooliviero.net follow me on twitter @maxoly http://www.slideshare.net/MassimoOliviero https://speakerdeck.com/massimooliviero