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tips & tricks
for iPhone application development
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adrian kosmaczewski
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akosma software
akosma.com
akosma.tumblr.com
github.com/akosma
linkedin.com/in/akosma
facebook.com/akosma
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@akosma
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some questions
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@perlausten?
@supermouse?
@williwu?
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new to iPhone?
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technologies?
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J2EE, J2ME, .NET, RoR, others?
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programming
languages?
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C / C++?
Java, C#?
Ruby, Python, Lua?
JavaScript?
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iPhone dev
≠
web dev
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Cocoa &
Objective-C
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born in the 80s
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Objective-C
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Objective-C Java
@interface &
@implementation
class
@protocol interface
#import // files! import // classes!
categories n/a
id n/a
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• Thin layer around C
• Message-dispatch runtime
• Static and dynamic (you choose)
• The “real” father of Java:
• http://cs.gmu.edu/~sean/stuff/java-objc.html
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• Single inheritance + interfaces (“@protocols”)
• @protocols can have optional methods
• Fields protected by default
• All methods are virtual and overridable
• Methods can be added to existing classes
• Full introspection / reflection
• Messages can be intercepted and forwarded
• à la AOP!
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Cocoa Touch
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iPhone Specifics
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128 or 256 MB RAM
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~70 MB for the OS!
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no swap file
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(no virtual memory)
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no garbage collector
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(manual memory
management)
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http://cocoadevcentral.com/d/learn_objectivec/
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no automatic objects
on the stack (C++)
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// C++
// Memory freed when out of scope
std::string name(“Adrian”);
std::string *name = NULL;
name = new std::string(“Adrian”);
delete name;
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hygiene
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memory warnings
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avoid autorelease
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lazy-loading & reuse
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custom table cells &
reuse
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override setters
properly
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beware of delegation
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instruments &
static analysis
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warnings as errors
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code organization
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(cheaper maintenance)
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iPhone ≠ computer
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http://www.flickr.com/photos/oskay/365607662/
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http://www.flickr.com/photos/blakespot/2379207825/
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http://www.flickr.com/photos/oskay/365607591/
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books
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thanks!
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questions?