These are the slides of my SXSW 2010 Objective-C Crash Course for Web Developers. The code samples (and the keynote document) can also be downloaded from http://workshop.verbogt.nl/

1. Objective-C Crash Course
for Web Developers

2. About me

3. About me
LinkedIn: jverbogt
Twitter: silentjohnny
Facebook: silentjohnny
E-mail: joris@mangrove.nl

4. History

12. iPhone SDK

13. AppStore

17. Build your own

18. TXXI

21. Today’s Topics

22. Today’s Topics

23. Today’s Topics
Native iPhone Development

24. Today’s Topics
Native iPhone Development
Live Demo

25. Today’s Topics
Native iPhone Development
Live Demo
Questions

26. iPhone Development

27. iPhone Development
Tools: Xcode / Interface Builder

28. iPhone Development
Tools: Xcode / Interface Builder
Language: Objective-C

29. iPhone Development
Tools: Xcode / Interface Builder
Language: Objective-C
Frameworks: Foundation / UIKit

30. Xcode

31. Xcode
Editor

32. Xcode
Editor
Debugger

33. Xcode
Editor
Debugger
Build Tools

34. Xcode
Editor
Debugger
Build Tools
Documentation

35. Interface Builder

36. Interface Builder
Design UI

37. Interface Builder
Design UI
Bind to code

38. Interface Builder
Design UI
Bind to code
Generate code

39. iPhone Simulator

40. iPhone Simulator
Easy for debugging

41. iPhone Simulator
Easy for debugging
No device needed

42. iPhone Simulator
Easy for debugging
No device needed
Fast round-trip

43. Not a real iPhone!

44. Objective-C

45. Objective-C

46. Objective-C
Superset of C, can be mixed

47. Objective-C
Superset of C, can be mixed
Simple syntax

48. Objective-C
Superset of C, can be mixed
Simple syntax
Dynamic runtime

49. OOP in Objective-C

50. OOP in Objective-C

51. OOP in Objective-C
Single inheritance class tree

52. OOP in Objective-C
Single inheritance class tree
Protocols for multi-class behavior

53. OOP in Objective-C
Single inheritance class tree
Protocols for multi-class behavior
Instance variables are hidden

54. OOP in Objective-C
Single inheritance class tree
Protocols for multi-class behavior
Instance variables are hidden
Objects respond to messages for interaction

55. OOP in Objective-C
Single inheritance class tree
Protocols for multi-class behavior
Instance variables are hidden
Objects respond to messages for interaction
Variables are bound to classes at runtime

56. OOP in Objective-C
Single inheritance class tree
Protocols for multi-class behavior
Instance variables are hidden
Objects respond to messages for interaction
Variables are bound to classes at runtime
There is an anonymous object type ‘id’

57. Syntax

58. Syntax

59. Syntax
float moneyInTheBank = 0.0;

60. Syntax
float moneyInTheBank = 0.0;
var moneyInTheBank = 0.0;

61. Syntax

62. Syntax
MacBookPro *myNewMac = [MacBookPro new];

63. Syntax
MacBookPro *myNewMac = [MacBookPro new];
var myNewMac = new MacBookPro();

64. Syntax

65. Syntax
if (moneyInTheBank > [myNewMac price]) {
// Go buy one!
}

66. Syntax
if (moneyInTheBank > [myNewMac price]) {
// Go buy one!
}
if (moneyInTheBank > myNewMac.getPrice()) {
// Go buy one!
}

67. Syntax

68. Syntax
for (i=1; i<count; i++) {
}

69. Messaging

70. Messaging

71. Messaging
NSString *name = [person name];

72. Messaging
NSString *name = [person name];
var name = person.getName();

73. Messaging

74. Messaging
[person setName:@”John”];

75. Messaging
[person setName:@”John”];
person.setName(”John”);

76. Messaging

77. Messaging
NSUInteger length = [[person name] length];

78. Messaging
NSUInteger length = [[person name] length];
var length = person.getName().getLength();

79. Messaging

80. Messaging
[person setName:name andAge:21];

81. Messaging
[person setName:name andAge:21];
person.set({name:name, age:21});

82. Creating Instances

83. Creating Instances

84. Creating Instances
Person *person = [[Person alloc] init];

85. Creating Instances
Person *person = [[Person alloc] init];
Person *person = [Person new];

86. Creating Instances
Person *person = [[Person alloc] init];
Person *person = [Person new];
Person *person = [Person person];

87. Memory Management

88. Memory Management

89. Memory Management
If you allocate memory,
you need to clean it up!

90. Memory Management

91. Memory Management
NSObject *keepMe = [[NSObject alloc] init];

92. Memory Management
NSObject *keepMe = [[NSObject alloc] init];
[keepMe retain];

93. Memory Management
NSObject *keepMe = [[NSObject alloc] init];
[keepMe retain];
[keepMe autorelease];

94. Memory Management
NSObject *keepMe = [[NSObject alloc] init];
[keepMe retain];
[keepMe autorelease];
[keepMe release];

95. Memory Management
NSObject *keepMe = [[NSObject alloc] init];
[keepMe retain];
[keepMe autorelease];
[keepMe release];
NSObject *keepMe = [NSObject object];

96. Categories

97. Categories

98. Categories
Extending classes without subclassing

99. Categories
Extending classes without subclassing
NSString *json = @”{“test”:”OK”}”;

100. Categories
Extending classes without subclassing
NSString *json = @”{“test”:”OK”}”;
SBJsonParser *parser =
[[SBJsonParser] alloc] init];
NSDictionary *data =
[parser objectWithString:json];

101. Categories
Extending classes without subclassing
NSString *json = @”{“test”:”OK”}”;
NSDictionary *data = [json JSONValue];

102. Categories

103. Categories
String.prototype.getJSONValue =
function() { return ... };

104. Categories
String.prototype.getJSONValue =
function() { return ... };
var json = “{”test”:”OK”}”;
var myObject = json.getJSONValue();

105. Foundation Classes

106. NSString

107. NSString

108. NSString
NSString *myName = @”joris”;

109. NSString
NSString *myName = @”joris”;
NSString *welcome = [NSString stringWithFormat:@”Hello %@”, name];

110. NSString
NSString *myName = @”joris”;
NSString *welcome = [NSString stringWithFormat:@”Hello %@”, name];
NSString *greeting = @”Hello ”;
NSString *welcome = [greeting stringByAppendingString:name];

111. NSString
NSString *myName = @”joris”;
NSString *welcome = [NSString stringWithFormat:@”Hello %@”, name];
NSString *greeting = @”Hello ”;
NSString *welcome = [greeting stringByAppendingString:name];
if ([myName isEqualToString:otherName]) {
// Strings are equal!
}

112. NSArray

113. NSArray

114. NSArray
NSArray *myArray = [NSArray arrayWithObjects:@”me”, @”you”, nil];

115. NSArray
NSArray *myArray = [NSArray arrayWithObjects:@”me”, @”you”, nil];
NSUInteger count = [myArray count];

116. NSArray
NSArray *myArray = [NSArray arrayWithObjects:@”me”, @”you”, nil];
NSUInteger count = [myArray count];
NSString *secondItem = [myArray objectAtIndex:1];

117. NSArray
NSArray *myArray = [NSArray arrayWithObjects:@”me”, @”you”, nil];
NSUInteger count = [myArray count];
NSString *secondItem = [myArray objectAtIndex:1];
for (NSString *name in myArray) {
NSLog(@”Name: %@”, name);
}

118. NSDictionary

119. NSDictionary

120. NSDictionary
NSDictionary *myDict = [NSDictionary dictionaryWithObjectsAndKeys:
@”joris”, @”firstname”,
@”verbogt”, @”lastname”,
nil];

121. NSDictionary
NSDictionary *myDict = [NSDictionary dictionaryWithObjectsAndKeys:
@”joris”, @”firstname”,
@”verbogt”, @”lastname”,
nil];
NSString *lastname = [myDict objectForKey:@”lastname”];

122. UIKit

123. Delegates

124. Delegates

125. Delegates
Many UIKit classes define delegate protocols

126. Delegates
Many UIKit classes define delegate protocols
No subclassing necessary for custom behavior

127. Delegates
Many UIKit classes define delegate protocols
No subclassing necessary for custom behavior
Loose coupling

128. Delegates
Many UIKit classes define delegate protocols
No subclassing necessary for custom behavior
Loose coupling
Easy refactoring

129. Connecting UI Elements

130. Connecting UI Elements

131. Connecting UI Elements
Code defines outlets to UI elements

132. Connecting UI Elements
Code defines outlets to UI elements
Code responds to actions from UI

133. Connecting UI Elements
Code defines outlets to UI elements
Code responds to actions from UI
UI Elements fire actions to a target

134. Connecting UI Elements
Code defines outlets to UI elements
Code responds to actions from UI
UI Elements fire actions to a target
Again: no subclassing

135. ViewControllers

136. ViewControllers

137. ViewControllers
Control a UI view (with sub-views)

138. ViewControllers
Control a UI view (with sub-views)
Ready to use, out-of-the-box

139. ViewControllers
Control a UI view (with sub-views)
Ready to use, out-of-the-box
Can be stacked for navigation

140. ViewControllers
Control a UI view (with sub-views)
Ready to use, out-of-the-box
Can be stacked for navigation
Can be initialized from code or IB

141. ViewControllers

142. ViewControllers
Useful Subclasses:

143. ViewControllers
Useful Subclasses:
TableViewController

144. ViewControllers
Useful Subclasses:
TableViewController
NavigationController

145. ViewControllers
Useful Subclasses:
TableViewController
NavigationController
TabBarController

146. Let’s do some coding...

147. Why?

148. Why?

149. Why?
Fun challenge

150. Why?
Fun challenge
Frameworks

151. Why?
Fun challenge
Frameworks
Best User Experience

152. Why?
Fun challenge
Frameworks
Best User Experience
Inspiration

153. Thank you

154. Copyright
Artwork by nozzman.com
Presentation by Joris Verbogt
This work is licensed under the Creative
Commons Attribution-Noncommercial-Share
Alike 3.0 Netherlands License.
Download at http://workshop.verbogt.nl/