Slide 1
Slide 1 text
Tips & Tricks
for iPhone Application
Development
Skills Matter - London - February 2nd 2010
Slide 2
Slide 2 text
No content
Slide 3
Slide 3 text
Adrian
Kosmaczewski
Slide 4
Slide 4 text
akosma software
akosma.com
akosma.tumblr.com
github.com/akosma
linkedin.com/in/akosma
facebook.com/akosma
Slide 5
Slide 5 text
@akosma
Slide 6
Slide 6 text
No content
Slide 7
Slide 7 text
some questions
Slide 8
Slide 8 text
new to iPhone?
Slide 9
Slide 9 text
designer?
developer?
Slide 10
Slide 10 text
technologies?
Slide 11
Slide 11 text
Android
J2EE
J2ME
.NET
Ruby on Rails
others?
Slide 12
Slide 12 text
programming
languages?
Slide 13
Slide 13 text
C / C++?
Java, C#?
Ruby, Python, Lua?
JavaScript?
Slide 14
Slide 14 text
No content
Slide 15
Slide 15 text
Dev Days for iPhone
Slide 16
Slide 16 text
Mon, April 26th 2010
Slide 17
Slide 17 text
Win a free ticket!
Slide 18
Slide 18 text
Fill your evaluation
form! :)
Slide 19
Slide 19 text
No content
Slide 20
Slide 20 text
iPhone dev
≠
web dev
Slide 21
Slide 21 text
No content
Slide 22
Slide 22 text
Cocoa &
Objective-C
Slide 23
Slide 23 text
born in the 80s
Slide 24
Slide 24 text
No content
Slide 25
Slide 25 text
No content
Slide 26
Slide 26 text
No content
Slide 27
Slide 27 text
No content
Slide 28
Slide 28 text
Objective-C
Slide 29
Slide 29 text
Objective-C Java
@interface &
@implementation
class (1 file)
@protocol interface
#import // files! import // classes!
categories
n/a (in C#, “class
extensions”)
id n/a (generics?)
Slide 30
Slide 30 text
Objective-C Java
@selector n/a
NSObject /
NSProxy / ...
Object
@public / @protected /
@private
public / protected /
private
@try / @catch / @finally
NSException
try / catch / finally
Exception
n/a package / namespace
Slide 31
Slide 31 text
• Thin layer around C
• Message-dispatch runtime
• Static and dynamic (you choose)
• The “real” inspiration for Java:
• http://cs.gmu.edu/~sean/stuff/java-
objc.html
Slide 32
Slide 32 text
• 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
Slide 33
Slide 33 text
No content
Slide 34
Slide 34 text
No content
Slide 35
Slide 35 text
No content
Slide 36
Slide 36 text
No content
Slide 37
Slide 37 text
Demo
Slide 38
Slide 38 text
No content
Slide 39
Slide 39 text
Cocoa Touch
Slide 40
Slide 40 text
No content
Slide 41
Slide 41 text
No content
Slide 42
Slide 42 text
iPhone Specifics
Slide 43
Slide 43 text
No content
Slide 44
Slide 44 text
128 or 256 MB RAM
Slide 45
Slide 45 text
~70 MB for the OS!
Slide 46
Slide 46 text
no swap file
Slide 47
Slide 47 text
(no virtual memory)
Slide 48
Slide 48 text
no garbage collector
Slide 49
Slide 49 text
(manual memory
management)
Slide 50
Slide 50 text
http://cocoadevcentral.com/d/learn_objectivec/
Slide 51
Slide 51 text
no automatic objects
on the stack (C++)
Slide 52
Slide 52 text
// C++
// Memory freed when out of scope
std::string name(“Adrian”);
std::string *name = NULL;
name = new std::string(“Adrian”);
delete name;
Slide 53
Slide 53 text
hygiene
Slide 54
Slide 54 text
No content
Slide 55
Slide 55 text
memory warnings
Slide 56
Slide 56 text
No content
Slide 57
Slide 57 text
avoid autorelease
Slide 58
Slide 58 text
No content
Slide 59
Slide 59 text
No content
Slide 60
Slide 60 text
lazy-loading & reuse
Slide 61
Slide 61 text
No content
Slide 62
Slide 62 text
custom table cells &
reuse
Slide 63
Slide 63 text
No content
Slide 64
Slide 64 text
override setters
properly
Slide 65
Slide 65 text
No content
Slide 66
Slide 66 text
beware of delegation
Slide 67
Slide 67 text
No content
Slide 68
Slide 68 text
instruments &
static analysis
Slide 69
Slide 69 text
No content
Slide 70
Slide 70 text
warnings as errors
Slide 71
Slide 71 text
No content
Slide 72
Slide 72 text
code organization
Slide 73
Slide 73 text
(cheaper
maintenance)
Slide 74
Slide 74 text
No content
Slide 75
Slide 75 text
iPhone ≠ computer
Slide 76
Slide 76 text
http://www.flickr.com/photos/oskay/365607662/
Slide 77
Slide 77 text
http://www.flickr.com/photos/blakespot/2379207825/
Slide 78
Slide 78 text
http://www.flickr.com/photos/oskay/365607591/
Slide 79
Slide 79 text
Mobile HIG
Slide 80
Slide 80 text
now more important
than ever!
Slide 81
Slide 81 text
No content
Slide 82
Slide 82 text
No content
Slide 83
Slide 83 text
No content
Slide 84
Slide 84 text
No content
Slide 85
Slide 85 text
NDA
Slide 86
Slide 86 text
No content
Slide 87
Slide 87 text
books
Slide 88
Slide 88 text
No content
Slide 89
Slide 89 text
No content
Slide 90
Slide 90 text
No content
Slide 91
Slide 91 text
No content
Slide 92
Slide 92 text
No content
Slide 93
Slide 93 text
No content
Slide 94
Slide 94 text
No content
Slide 95
Slide 95 text
No content
Slide 96
Slide 96 text
No content
Slide 97
Slide 97 text
thanks!
Slide 98
Slide 98 text
Please fill your
evaluation forms!
Slide 99
Slide 99 text
(you could win a ticket)
Slide 100
Slide 100 text
questions?