@florianbuerger 

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Debugging Tools Profiling 

Debugging 

Exception Type: SIGSEGV Exception Codes: SEGV_ACCERR at 0x24 Crashed Thread: 14 (...) Thread 14 Crashed: 0 AGXGLDriver 0x2f24e37e agxuReloadCtxVertexConstants(GLDContextRec*, void*) + 2 1 GLEngine 0x326a4a37 gleDoDrawDispatchCoreES2 + 592 2 GLEngine 0x3268440b glDrawElements_IMM_ES2Exec + 184 3 QuartzCore 0x32916595 CA::OGL::GLContext::draw_elements(CA::OGL:: 4 QuartzCore 0x32916437 CA::OGL::Context::array_flush() + 88 5 QuartzCore 0x329162ab CA::OGL::Context::ClippedArray::next_rect(CA::Bounds&) + 220 6 QuartzCore 0x329449c7 CA::OGL::emit_quad_indices(CA::OGL::Context&, CA::OGL::RectState const&, 7 QuartzCore 0x32944845 CA::OGL::emit_mesh_with_center(CA::OGL::Context&, CA::OGL::RectState const&, 8 QuartzCore 0x3294d6ed CA::OGL::emit_n_part_rect(CA::OGL::Context&, CA::OGL::RectState const&, int, 9 QuartzCore 0x3294aff1 CA::OGL::emit_shadow_path(CA::OGL::Context&, double, CA::Vec2 const&, 10 QuartzCore 0x32928ae1 CA::CG::DrawPathShadow::draw_shadow(CA::CG::Renderer&, bool) const + 278 11 QuartzCore 0x32913b05 CA::CG::DrawOp::render(CA::CG::Renderer&) const + 738 12 QuartzCore 0x32912791 CA::CG::Queue::render_callback(void*) + 250 13 libdispatch.dylib 0x3b07ee7b _dispatch_queue_drain + 372 14 libdispatch.dylib 0x3b07bf93 _dispatch_queue_invoke + 40 15 libdispatch.dylib 0x3b07f745 _dispatch_root_queue_drain + 74 16 libdispatch.dylib 0x3b07f9c5 _dispatch_worker_thread2 + 54 17 libsystem_pthread.dylib 0x3b1a9dff _pthread_wqthread + 298 18 libsystem_pthread.dylib 0x3b1a9cc4 start_wqthread + 8 

Panik&Ruhig&atmen 

Mentales(Modell(=>( 

Debugging(is(twice(as(hard(as( wri1ng(the(code(in(the(first(place.( Therefore,(if(you(write(the(code(as( cleverly(as(possible,(you(are,(by( defini1on,(not(smart(enough(to( debug(it.( —"Brian"Kernighan 

100%$Verständnis 

Tools 

Xcode&Debugger 

Alle$Breakpoints$ de0/ak2vieren Standort simulieren Programm0 ausführung$ kontrollieren 

Demo 

Watch&on&Vimeo h"ps:/ /vimeo.com/97512083 

Target'Schemes 

Launch'Arguments 

-NSShowNonLocalizedStrings YES -NSDoubleLocalizedStrings YES -AppleLanguages (German) 

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LLDB$Debugger 

(…) po expr (…) 

po (NSString *)[self title]!→""Foo" 

expr [self setTitle:@"Bar"]!→""Bar" 

Aliase command alias spark \ p (void*)dlopen("(...)/SparkInspector.dylib") 

chisel 

Danke&Facebook 1. Sammlung*von*LLDB*Kommandos 2. presponder*=>*Ausgabe*der*Responder*Chain 3. (...) 4. brew install chisel 

Demo 

Watch&on&Vimeo h"ps:/ /vimeo.com/97512085 

Wissen&weitergeben ~/.lldbinit !!dynamic!Library!für!iOS!! http://defagos.roon.io/sharing-lldb-debugging- helpers-between-projects-using-a-dynamic-library 

Logging 

Logging&!=&NSLog 

Logging&via&Breakpoints 

Logging&via&Breakpoints kein%Neu(Kompilieren De#/Ak'vierung.mit.einem.Klick Logs%in%Release%builds 

CocoaLumberjack 

Schnell Mäch%g Flexibel 

NSLogger(❤(CocoaLumberjack 

Demo 

View%Inspec+on 

Spark&Inspector Reveal 

Spark&Inspector&der&laufenden&App&hinzufügen command alias spark p \ (void*)dlopen(" \ (…)Spark Inspector.app/(…)SparkInspector.dylib") 

Live%Änderungen 

Demo 

Zusammenfassung Wissen&über&Code&ist&falsch NSLog()!=>!CocoaLumberjack Reveal!oder!Spark*Inspector 

Profiling 

Vermuten(Messen! 

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Performance 

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60#FPS! 

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Core%Data 

Caching Disk%I/O 

Demo 

Q&A 

Links&(1/2) • Florian)Bürger)→)h0p:/ /florianbuerger.com • keslcod)GmbH)→)h0p:/ /keslcod.com • LLDB)Kommandos)→)h0ps:/ /developer.apple.com/(…) • Facebook)chisel)→)h0ps:/ /github.com/facebook/chisel • Dynamic)Library)für)iOS)→)h0p:/ /defagos.roon.io/(…) • Cocoa)Lumberjack)→)h0ps:/ /github.com/CocoaLumberjack/ CocoaLumberjack 

Links&(2/2) • NSLogger)→)h,ps:/ /github.com/fpillet/NSLogger • NSLogger)zu)CoocaLumberjack)Connector)→)h,ps:/ /github.com/ steipete/NSLogger@CocoaLumberjack@connector • Spark)Inspector)→)h,p:/ /sparkinspector.com • Reveval)→)h,p:/ /revealapp.com