The slides from a talk I gave to BCS Newcastle in January 2012. This is an updated form of my standard iOS talk.

1. iPhoneNewcastle
BCS development a brief introduction pete goodliffe
Hello,
world!
iPhone
iOS
Development
a brief introduction
rkably , very
rema
really,
Pete Goodliffe
pete@goodliffe.net

2. iPhone development a brief introduction pete goodliffe
Pete Goodliffe
A programmer, a columnist,
an author, a teacher. Someone
who cares about code.
www.goodliffe.net
goodliffe.blogspot.com
@petegoodliffe

3. iPhone development a brief introduction pete goodliffe
Pete Goodliffe
A programmer, a columnist,
an author, a teacher. Someone
who cares about code.
www.goodliffe.net
goodliffe.blogspot.com
@petegoodliffe

4. iPhone development a brief introduction pete goodliffe

5. iPhone development a brief introduction pete goodliffe
talk synopsis
An introduction to iPhone/iOS development
An introduction to iPhone development for beginners or those who are casually
interested and want a leg up the learning curve.
This talk is an overview of how to get started as an iPhone developer, and an
introduction to the core technologies, including:
‣ Common iPhone/Mac OS design patterns, idioms, and practices
‣ Becoming a native: how to "think in iPhone"
‣ Overview of the libraries and facilities that exist
‣ Limitations of the development environment

6. iPhone development a brief introduction pete goodliffe
90 minutes? is that all?!!!

7. iPhone development a brief introduction pete goodliffe
in 90 minutes... Demo Intro
‣ Intro
‣ The tools Tips
‣ The language Tools
‣ The UI
‣ Key technologies
‣ Deploying Further info
‣ Further info Language
‣ Tips and tricks Deploying
‣ The demo UI
Technologies
m… pie
Mm

8. iPhone development a brief introduction pete goodliffe
in 90 minutes... Demo
Intro
‣ Intro
Introduction
‣ The tools Tips
‣ The language Tools
‣ The UI
‣ Key technologies
‣ Deploying Further info
‣ Further info Language
‣ Tips and tricks Deploying
‣ The demo UI
Technologies

9. iPhone development a brief introduction pete goodliffe
who are you?

10. iPhone development a brief introduction pete goodliffe
why develop
for the iPhone?

11. iPhone development a brief introduction pete goodliffe
the alternatives

12. iPhone development a brief introduction pete goodliffe
in 90 minutes... Demo
Intro
‣ Intro
‣ The tools Tips
‣ The language Tools
‣ The UI
‣ Key technologies
‣ Deploying Further info
‣ Further info Language
‣ Tips and tricks Deploying
‣ The demo UI
Technologies

13. iPhone development a brief introduction pete goodliffe
in 90 minutes... Demo Intro
‣ Intro
‣ The tools Tips
‣ The language Tools
‣ The UI
‣ Key technologies
‣ Deploying Further info
‣ Further info Language
‣ Tips and tricks Deploying
‣ The demo UI
Technologies

14. iPhone development a brief introduction pete goodliffe
in 90 minutes... Demo Intro
‣ Intro
The tools
‣ The tools Tips Tools
‣ The language
‣ The UI
‣ Key technologies
‣ Deploying Further info
‣ Further info Language
‣ Tips and tricks Deploying
‣ The demo UI
Technologies

15. iPhone development a brief introduction pete goodliffe
❖ The cast ❖
Xcode
iPhone/iPod Touch/iPad
(Interface builder)
iPhone simulator
Instruments/Shark
iOS Provisioning Portal
Other tools

16. iPhone development a brief introduction pete goodliffe
Xcode

17. iPhone development a brief introduction pete goodliffe

18. iPhone development a brief introduction pete goodliffe

19. iPhone development a brief introduction pete goodliffe
an iPhone

20. iPhone development a brief introduction pete goodliffe
Interface Builder

21. iPhone development a brief introduction pete goodliffe
iPhone simulator

22. iPhone development a brief introduction pete goodliffe
Instruments/Shark

23. iPhone development a brief introduction pete goodliffe
Other tools

24. iPhone development a brief introduction pete goodliffe
Getting set up...
Get a Mac
Get the tools
Install
Get an ADC account $$$
Code
…
Profit

25. iPhone development a brief introduction pete goodliffe
in 90 minutes... Demo Intro
‣ Intro
‣ The tools Tips Tools
‣ The language
‣ The UI
‣ Key technologies
‣ Deploying Further info
‣ Further info Language
‣ Tips and tricks Deploying
‣ The demo UI
Technologies

26. iPhone development a brief introduction pete goodliffe
in 90 minutes... Demo Intro
‣ Intro
‣ The tools Tips
‣ The language Tools
‣ The UI
‣ Key technologies
‣ Deploying Further info
‣ Further info Language
‣ Tips and tricks Deploying
‣ The demo UI
Technologies

27. iPhone development a brief introduction pete goodliffe
in 90 minutes... Demo Intro
‣ Intro
The language
‣ The tools Tips
‣ The language Tools
‣ The UI
‣ Key technologies
‣ Deploying Further info
‣ Further info Language
‣ Tips and tricks Deploying
‣ The demo UI
Technologies

28. iPhone development a brief introduction pete goodliffe
(well, languages)
C
C++
Objective-C

29. iPhone development a brief introduction pete goodliffe
(well, languages)
C
C++
Objective-C

30. iPhone development a brief introduction pete goodliffe

31. iPhone development a brief introduction pete goodliffe
a history of
objective-c in 14
lines and 12 words
(give or take)

32. iPhone development a brief introduction pete goodliffe
algol
CPL Simula
BCPL Smalltalk
B
C
Objective-C
C++
Java C# D

33. iPhone development a brief introduction pete goodliffe
objective C is...
dynamic
based on message passing
follows C compilation model
full of [ ] and @s
ot too
n
- (id) thisIsAMethod:(int)param1 ry!
signature:(float)param2 sca
{
for (int n (brace n < 10; ++n)
= 0; yourself)
{
NSLog(@”N=%d”, n);
[object callMethod:1 thing:2];
}
}

34. iPhone development a brief introduction pete goodliffe
.m file
@implementation MyClass
- (id) thisIsAMethod:(int)param1
signature:(float)param2
{
for (int n = 0; n < 10; ++n)
{
NSLog(@”N=%d”, n);
[object callMethod:1 thing:2];
}
}
@end

35. iPhone development a brief introduction pete goodliffe
@implementation MyClass
- (id) thisIsAMethod:(int)param1
@class
signature:(float)param2
{ @interface
@implementation
for (int n = 0; n < 10; ++n)
{ @end
NSLog(@”N=%d”, n);
@property
[object callMethod:1 thing:2];
@private
}
} @protected
@end

36. iPhone development a brief introduction pete goodliffe
@implementation MyClass
- (id) thisIsAMethod:(int)param1
signature:(float)param2
{
for (int n = 0; n < 10; ++n)
{
NSLog(@”N=%d”, n);
[object callMethod:1 thing:2];
}
}
@end

37. iPhone development a brief introduction pete goodliffe
@implementation MyClass
- (id) thisIsAMethod:(int)param1
signature:(float)param2
{
for (int n = 0; n < 10; ++n)
{
NSLog(@”N=%d”, n);
[object callMethod:1 thing:2];
}
}
@end

38. iPhone development a brief introduction pete goodliffe
@implementation MyClass
- (id) thisIsAMethod:(int)param1
signature:(float)param2
{
for (int n = 0; n < 10; ++n)
{
NSLog(@”N=%d”, n);
[object callMethod:1 thing:2];
}
}
@end

39. iPhone development a brief introduction pete goodliffe
@implementation MyClass
- (id) thisIsAMethod:(int)param1
signature:(float)param2
C an
{ stil
l
C fr write
for (int n = 0; n < 10; ++n)ee func (and c
tion all)
{ s
NSLog(@”N=%d”, n);
[object callMethod:1 thing:2];
}
}
@end

40. iPhone development a brief introduction pete goodliffe
@implementation MyClass
- (id) thisIsAMethod:(int)param1
signature:(float)param2
{
for (int n = 0; n < 10; ++n)
{
NSLog(@”N=%d”, n);
NSS
[object callMethod:1 thing:2];
tri
} ng
}
@end

41. iPhone development a brief introduction pete goodliffe
@implementation MyClass
- (id) thisIsAMethod:(int)param1
signature:(float)param2
{
for (int n = 0; n < 10; ++n)
{
NSLog(@”N=%d”, n);
[object callMethod:1 thing:2];
}
}
@end

42. iPhone development a brief introduction pete goodliffe
@implementation MyClass
- (id) thisIsAMethod:(int)param1
signature:(float)param2
{
for (int n = 0; n < 10; ++n)
{
NSLog(@”N=%d”, n);
[object callMethod:1 thing:2];
} Can
} call
nil
@end

43. iPhone development a brief introduction pete goodliffe
Sending messages
[object method];
int i = [object method];
[[object method1] method2];
[object method:10];
[object1 method:[object 2:method]];

44. iPhone development a brief introduction pete goodliffe
Method names
parameters
object
[circle setCenterAtX:110 y:675];
method name
selector name is: setCenterAtX:y:
method declared as:
- (void) setCentreAtX:(float)x y:(float)y
SEL s = @selector(setCenterAtX:y:);
[circle performSelector:s];

45. iPhone development a brief introduction pete goodliffe
parameter types:
int, float, unsigned, etc
syntax: (return type)
id

46. iPhone development a brief introduction pete goodliffe
.h file
@class ForwardDeclaration;
@interface MyClass : NSObject
{
ForwardDeclaration *member;
bool otherMember;
}
- (id) init;
- (id) initWithItems:(NSArray*)array
enabled:(bool)enabled;
+ (id) myClassWithItems:(NSArray*)array;
@end

47. iPhone development a brief introduction pete goodliffe
@class ForwardDeclaration;
@interface MyClass : NSObject
{
ForwardDeclaration *member;
bool otherMember;
}
- (id) init;
- (id) initWithItems:(NSArray*)array
enabled:(bool)enabled;
+ (id) myClassWithItems:(NSArray*)array;
@end

48. iPhone development a brief introduction pete goodliffe
@class ForwardDeclaration;
@interface MyClass : NSObject
{
ForwardDeclaration *member;
bool otherMember;
}
- (id) init;
- (id) initWithItems:(NSArray*)array
enabled:(bool)enabled;
+ (id) myClassWithItems:(NSArray*)array;
@end

49. iPhone development a brief introduction pete goodliffe
@class ForwardDeclaration;
@interface MyClass : NSObject
{
ForwardDeclaration *member;
bool otherMember;
}
- (id) init;
- (id) initWithItems:(NSArray*)array
enabled:(bool)enabled;
+ (id) myClassWithItems:(NSArray*)array;
@end

50. iPhone development a brief introduction pete goodliffe
@class ForwardDeclaration;
@interface MyClass : NSObject
{
ForwardDeclaration *member;
bool otherMember;
}
- (id) init;
- (id) initWithItems:(NSArray*)array
enabled:(bool)enabled;
+ (id) myClassWithItems:(NSArray*)array;
@end

51. iPhone development a brief introduction pete goodliffe
@class ForwardDeclaration;
@interface MyClass : NSObject
{
ForwardDeclaration *member;
bool otherMember;
}
nda nt)
(redu
- (id) init;
- (id) initWithItems:(NSArray*)array
enabled:(bool)enabled;
+ (id) myClassWithItems:(NSArray*)array;
@end

52. iPhone development a brief introduction pete goodliffe
@class ForwardDeclaration;
@interface MyClass : NSObject
{
ForwardDeclaration *member;
bool otherMember;
}
- (id) init;
- (id) initWithItems:(NSArray*)array
enabled:(bool)enabled;
+ (id) myClassWithItems:(NSArray*)array;
@end

53. iPhone development a brief introduction pete goodliffe
Objective C++
In .mm files
Classes can contain C++ objects
May use C++ constructs in functions
You can use RAII
C++ libraries

54. iPhone development a brief introduction pete goodliffe
Properties
@interface MyClass
{
int harold;
}
@property (nonatomic) int harold;
@end
In MyClass.m...
@interface MyClass
@synthesize harold;
@end
This will become
important when we
look at creating UIs

55. iPhone development a brief introduction pete goodliffe
The tao of objects
You don’t call methods
You pass messages to objects
[theObject sendMessage:parameter];

56. iPhone development a brief introduction pete goodliffe
Java, C++, C#
object.myMethod(1066);
MyClass
myMethod(int)
MyClass *this
another()
more()
class MyClass
{
private data public myMethod(int i)
{
// ...
}
};

57. iPhone development a brief introduction pete goodliffe
Objective-C
[object myMethod:1066];
MyClass
message
(selector)
MyClass *self
myMethod(int)
another()
@implementation MyClass
- (void) myMethod:(int)i
private data {
// ...
}
@end

58. iPhone development a brief introduction pete goodliffe
Categories
@interface NSObject (Foo)
- (void) extraFooMethod;
@end
NSArray *array = [NSArray array];
[array extraFooMethod];

59. iPhone development a brief introduction pete goodliffe
Object lifetime
All objects are reference counted
(the retain count)
NSArray *array1 = [[NSArray alloc] init];
NSArray *array2 = [NSArray array];
[array1 release];
[array2 release]; // wrong
Circle *circle = [[Circle alloc] initAtCenterX:100
y:100
radius:200];

60. iPhone development a brief introduction pete goodliffe
Retain
Action count
obj=[[ClassType alloc] init]; 1
[obj retain]; 2
[obj release]; 1
[obj release]; 0
[object dealloc];

61. iPhone development a brief introduction pete goodliffe
Retain
Action count
obj=[[ClassType alloc] init]; 1
[obj retain]; 2
[obj release]; 1
[obj release]; 0
[object dealloc];

62. iPhone development a brief introduction pete goodliffe
ARC
automatic reference counting

63. iPhone development a brief introduction pete goodliffe
The usual suspects
NSObject
NSString
NSArray NSMutableArray
NSNumber
NSThread
NSDictionary NSMutableDictionary
NSApplication
NSData NSMutableData
NSURL
NSSet NSMutableSet
NSValue

64. iPhone development a brief introduction pete goodliffe
Miscellany
Statically typed my arse
#import
Constructor kludgery

65. iPhone development a brief introduction pete goodliffe
Idioms
Delegates
Key-value coding
Protocol (interfaces)
formal and informal

66. iPhone development a brief introduction pete goodliffe
The libraries
Objective C
Cocoa Touch UIKit, etc
Core Audio, Open GL ES,
Media Quartz, Core Animation
Core Services
Core OS Posix, SQLite, Core
Foundation, BSD
C

67. iPhone development a brief introduction pete goodliffe
in 90 minutes... Demo Intro
‣ Intro
‣ The tools Tips
‣ The language Tools
‣ The UI
‣ Key technologies
‣ Deploying Further info
‣ Further info Language
‣ Tips and tricks Deploying
‣ The demo UI
Technologies

68. iPhone development a brief introduction pete goodliffe
in 90 minutes... Demo Intro
‣ Intro
‣ The tools Tips
‣ The language Tools
‣ The UI
‣ Key technologies
‣ Deploying Further info
‣ Further info Language
‣ Tips and tricks Deploying
‣ The demo UI
Technologies

69. iPhone development a brief introduction pete goodliffe
in 90 minutes... Demo Intro
‣ Intro
The UI
‣ The tools Tips
‣ The language Tools
‣ The UI
‣ Key technologies
‣ Deploying Further info
‣ Further info Language
‣ Tips and tricks Deploying
‣ The demo
Technologies
UI

70. iPhone development a brief introduction pete goodliffe
Interface Builder

71. iPhone development a brief introduction pete goodliffe
Held in .xib files
(Compiled NIBs)
Loaded into application
(semi-automatically)
IB is integrated into Xcode
UIKit framework

72. iPhone development a brief introduction pete goodliffe

73. iPhone development a brief introduction pete goodliffe
Create UI elements
Link to an object reference in
the XIB through properties
marked as IBOutlet
Link actions to methods
defined IBAction

74. iPhone development a brief introduction pete goodliffe
Storyboards
(just don’t)

75. iPhone development a brief introduction pete goodliffe
//
// ExampleAppDelegate.h
// Example
//
// Created by Pete Goodliffe on 03/04/2010.
// Copyright __MyCompanyName__ 2010. All rights reserved.
//
#import <UIKit/UIKit.h>
@interface ExampleAppDelegate : NSObject <UIApplicationDelegate> {
UIWindow *window;
UINavigationController *navigationController;
}
@property (nonatomic, retain) IBOutlet UIWindow *window;
@property (nonatomic, retain) IBOutlet UINavigationController *navigationController;
@end

76. iPhone development a brief introduction pete goodliffe
in 90 minutes... Demo Intro
‣ Intro
‣ The tools Tips
‣ The language Tools
‣ The UI
‣ Key technologies
‣ Deploying Further info
‣ Further info Language
‣ Tips and tricks Deploying
‣ The demo
Technologies
UI

77. iPhone development a brief introduction pete goodliffe
in 90 minutes... Demo Intro
‣ Intro
‣ The tools Tips
‣ The language Tools
‣ The UI
‣ Key technologies
‣ Deploying Further info
‣ Further info Language
‣ Tips and tricks Deploying
‣ The demo UI
Technologies

78. iPhone development a brief introduction pete goodliffe
‣ Intro
Key
in 90 minutes...
‣ The tools
‣ The language
‣ The UI
Tips
Demo Intro
Tools
technologies
‣ Key technologies
‣ Deploying Further info
‣ Further info Language
‣ Tips and tricks Deploying
‣ The demo UI
Technologies

79. iPhone development a brief introduction pete goodliffe
UIKit
Core Graphics (Quartz)
Core Animation
Core Audio
Media Core / AVFoundation
MapKit / Core Location
CoreData (or sqlite)
OpenGL ES
External Accessory

80. iPhone development a brief introduction pete goodliffe
iOS 1
Remember that?

81. iPhone development a brief introduction pete goodliffe
iOS 2 New in iOS 3
iPad (popovers, split views)
Being able to write apps ! Gesture recognizers
Copy & paste
File sharing via iTunes
Supported file types
External display
New in iOS 4 CoreText
MMS
Multitasking
Blocks & GCD
Game Center
EventKit: Calendar access New in iOS 5
In-app SMS iCloud Storage
Media access ARC
QuickLook Xcode 4
iAd Storyboards
New audio/video APIs Newstand
Twitter Integration
Notification Center
Core Image
New instruments
Location Simulation

82. iPhone development a brief introduction pete goodliffe
in 90 minutes... Demo Intro
‣ Intro
‣ The tools Tips
‣ The language Tools
‣ The UI
‣ Key technologies
‣ Deploying Further info
‣ Further info Language
‣ Tips and tricks Deploying
‣ The demo UI
Technologies

83. iPhone development a brief introduction pete goodliffe
in 90 minutes... Demo Intro
‣ Intro
‣ The tools Tips
‣ The language Tools
‣ The UI
‣ Key technologies
‣ Deploying Further info
‣ Further info Language
‣ Tips and tricks Deploying
‣ The demo UI
Technologies

84. iPhone development a brief introduction pete goodliffe
in 90 minutes... Demo Intro
‣ Intro
Deploying
‣ The tools Tips
‣ The language Tools
‣ The UI
‣ Key technologies
‣ Deploying Further info
‣ Further info Language
‣ Tips and tricks
‣ The demo Deploying
UI
Technologies

85. iPhone development a brief introduction pete goodliffe
Deploying
iPhone
simulator iPhone
developer account ($$$)
free
“DRM hell”
x86
Deployment certificates
runs at desktop speed
different build targets 100 devices per year
more memory
network stable
App
store iTunes Connect
Another build type

86. iPhone development a brief introduction pete goodliffe
App
store
submit
get rejected
fix it
resubmit
profit

87. iPhone development a brief introduction pete goodliffe

88. iPhone development a brief introduction pete goodliffe

89. iPhone development a brief introduction pete goodliffe

90. iPhone development a brief introduction pete goodliffe

91. iPhone development a brief introduction pete goodliffe

92. iPhone development a brief introduction pete goodliffe

93. iPhone development a brief introduction pete goodliffe

94. iPhone development a brief introduction pete goodliffe
in 90 minutes... Demo Intro
‣ Intro
‣ The tools Tips
‣ The language Tools
‣ The UI
‣ Key technologies
‣ Deploying Further info
‣ Further info Language
‣ Tips and tricks
‣ The demo Deploying
UI
Technologies

95. iPhone development a brief introduction pete goodliffe
in 90 minutes... Demo Intro
‣ Intro
‣ The tools Tips
‣ The language Tools
‣ The UI
‣ Key technologies
‣ Deploying Further info
‣ Further info Language
‣ Tips and tricks Deploying
‣ The demo UI
Technologies

96. iPhone development a brief introduction pete goodliffe
in 90 minutes... Demo Intro
‣ Intro
Further info
‣ The tools Tips
‣ The language Tools
‣ The UI
‣ Key technologies
‣ Deploying Further info
‣ Further info Language
‣ Tips and tricks Deploying
‣ The demo UI
Technologies

97. iPhone development a brief introduction pete goodliffe
Xcode documentation
developer.apple.com/iphone
Books
Websites
Stack Overflow, CocoaDev, ADC
Videos on iTunes U
http://itunes.stanford.edu/

98. iPhone development a brief introduction pete goodliffe
in 90 minutes... Demo Intro
‣ Intro
‣ The tools Tips
‣ The language Tools
‣ The UI
‣ Key technologies
‣ Deploying Further info
‣ Further info Language
‣ Tips and tricks Deploying
‣ The demo UI
Technologies

99. iPhone development a brief introduction pete goodliffe
in 90 minutes... Demo Intro
‣ Intro
‣ The tools Tips
‣ The language Tools
‣ The UI
‣ Key technologies
‣ Deploying Further info
‣ Further info Language
‣ Tips and tricks Deploying
‣ The demo UI
Technologies

100. iPhone development a brief introduction pete goodliffe
in 90 minutes...
‣ Intro
‣ The tools
‣ The language
‣ The UI
Tips Tips
Demo Intro
Tools
and tricks
‣ Key technologies
‣ Deploying Further info
‣ Further info Language
‣ Tips and tricks Deploying
‣ The demo UI
Technologies

101. iPhone development a brief introduction pete goodliffe
Thinking iPhone

102. iPhone development a brief introduction pete goodliffe
Get the UI right
HIG
resource conservation
(alpha blending, prerendering)
asynchrony

103. iPhone development a brief introduction pete goodliffe
The network is not always
available

104. iPhone development a brief introduction pete goodliffe
Do not write to disk
(often)

105. iPhone development a brief introduction pete goodliffe
Conserve resources
RAM
CPU
filesystem

106. iPhone development a brief introduction pete goodliffe
in 90 minutes... Demo Intro
‣ Intro
‣ The tools Tips
‣ The language Tools
‣ The UI
‣ Key technologies
‣ Deploying Further info
‣ Further info Language
‣ Tips and tricks Deploying
‣ The demo UI
Technologies

107. iPhone development a brief introduction pete goodliffe
in 90 minutes... Demo Intro
‣ Intro
‣ The tools Tips
‣ The language Tools
‣ The UI
‣ Key technologies
‣ Deploying Further info
‣ Further info Language
‣ Tips and tricks Deploying
‣ The demo UI
Technologies

108. iPhone development a brief introduction pete goodliffe
in 90 minutes... Demo
Intro
‣ Intro
The demo
‣ The tools Tips
‣ The language Tools
‣ The UI
‣ Key technologies
‣ Deploying Further info
‣ Further info Language
‣ Tips and tricks Deploying
‣ The demo UI
Technologies

109. iPhone development a brief introduction pete goodliffe
(wish me luck)
wasn’t that
marvellous?!

110. iPhone development a brief introduction pete goodliffe

111. iPhone development a brief introduction pete goodliffe
Pete Goodliffe
pete@goodliffe.net