1. iOS Development

2. iOS Development
• About Me:
• Pat Zearfoss
• Mindgrub Technologies, LLC
• BS Computer Science - UMBC 2008
• Working with mobile and iOS for 3
years.

3. iOS Development
• Web:
pzearfoss@gmail.com
http://zearfoss.wordpress.com
@pzearfoss
http://www.github.com/pzearfoss

4. Development Options

5. Development Options
HTML 5

6. Development Options
HTML 5 Cross Platform

7. Development Options
HTML 5 Cross Platform Native

8. HTML 5

9. HTML 5
• Use the technologies you already know.

10. HTML 5
• Use the technologies you already know.
• Can be loaded into an app webview and
distributed on the app store.

11. HTML 5
• Use the technologies you already know.
• Can be loaded into an app webview and
distributed on the app store.
• Limited use of device hardware.

12. HTML 5
• Use the technologies you already know.
• Can be loaded into an app webview and
distributed on the app store.
• Limited use of device hardware.
• Cross Platform

13. HTML 5
• Use the technologies you already know.
• Can be loaded into an app webview and
distributed on the app store.
• Limited use of device hardware.
• Cross Platform
• Except for all the cross browser
problems you already know and love.

14. Cross Platform
Frameworks

15. Cross Platform
Frameworks
• Titanium, PhoneGap, Others

16. Cross Platform
Frameworks
• Titanium, PhoneGap, Others
• Use the technologies you already know.

17. Cross Platform
Frameworks
• Titanium, PhoneGap, Others
• Use the technologies you already know.
• Titanium generates native code.

18. Cross Platform
Frameworks
• Titanium, PhoneGap, Others
• Use the technologies you already know.
• Titanium generates native code.
• PhoneGap uses web code in a webview.

19. Cross Platform
Frameworks
• Titanium, PhoneGap, Others
• Use the technologies you already know.
• Titanium generates native code.
• PhoneGap uses web code in a webview.
• Better use of device hardware.

20. Cross Platform
Frameworks
• Titanium, PhoneGap, Others
• Use the technologies you already know.
• Titanium generates native code.
• PhoneGap uses web code in a webview.
• Better use of device hardware.
• “Cross Platform”

21. Cross Platform
Frameworks
• Titanium, PhoneGap, Others
• Use the technologies you already know.
• Titanium generates native code.
• PhoneGap uses web code in a webview.
• Better use of device hardware.
• “Cross Platform”
• Your mileage may vary.

22. Native

23. Native
• Offers the most control over your product.

24. Native
• Offers the most control over your product.
• Access to all device frameworks.

25. Native
• Offers the most control over your product.
• Access to all device frameworks.
• Requires Objective-C

26. Native
• Offers the most control over your product.
• Access to all device frameworks.
• Requires Objective-C
• Only runs on iOS (obviously)

27. Native
• Offers the most control over your product.
• Access to all device frameworks.
• Requires Objective-C
• Only runs on iOS (obviously)
• Will generally run with the absolute best
performance.

28. Xcode
• Download from App Store
$4.99 Download

29. Xcode
• Download from App Store
$4.99 Download

30. Xcode
• Download from App Store
$4.99 Download
4.1 is now free

31. Getting Started

32. Getting Started
• Things you should know

33. Getting Started
• Things you should know
• Classical OO

34. Getting Started
• Things you should know
• Classical OO
• Classes

35. Getting Started
• Things you should know
• Classical OO
• Classes
• Inheritance

36. Getting Started
• Things you should know
• Classical OO
• Classes
• Inheritance
• Polymorphism

37. Getting Started

38. Getting Started
• Recommended but not required

39. Getting Started
• Recommended but not required
• Some knowledge of C

40. Getting Started
• Recommended but not required
• Some knowledge of C
• malloc() . . . free() ?

41. Getting Started
• Recommended but not required
• Some knowledge of C
• malloc() . . . free() ?
• Some knowledge of design patterns:

42. Getting Started
• Recommended but not required
• Some knowledge of C
• malloc() . . . free() ?
• Some knowledge of design patterns:
• MVC, Singleton, Delegation

43. Objective-C in 10
minutes

44. About Objective-C

45. About Objective-C
• Object Oriented superset over C

46. About Objective-C
• Object Oriented superset over C
Standard C

47. About Objective-C
• Object Oriented superset over C
Standard C
Objective-C

48. About Objective-C
• Object Oriented superset over C
Standard C
Objective-C
• Anything that works in C will work in
Objective-C

49. Obj-C in 10 minutes

50. Obj-C in 10 minutes
• All the things you know from C

51. Obj-C in 10 minutes
• All the things you know from C
• Variables are typed:

52. Obj-C in 10 minutes
• All the things you know from C
• Variables are typed:
• int, float, double, char

53. Obj-C in 10 minutes
• All the things you know from C
• Variables are typed:
• int, float, double, char
int foo = 5;

54. Obj-C in 10 minutes
• All the things you know from C
• Variables are typed:
• int, float, double, char
int foo = 5;
• Separate compilation

55. Obj-C in 10 minutes
• All the things you know from C
• Variables are typed:
• int, float, double, char
int foo = 5;
• Separate compilation
• .h for interface declaration

56. Obj-C in 10 minutes
• All the things you know from C
• Variables are typed:
• int, float, double, char
int foo = 5;
• Separate compilation
• .h for interface declaration
• .m for implementation (instead of .c)

57. Obj-C in 10 minutes

58. Obj-C in 10 minutes
• Functions / Methods have return types and
typed arguments

59. Obj-C in 10 minutes
• Functions / Methods have return types and
typed arguments
int sumOfItems(int i, int j)
{
return i + j;
}

60. Obj-C in 10 minutes
• Functions / Methods have return types and
typed arguments
int sumOfItems(int i, int j)
{
return i + j;
}
• Other types

61. Obj-C in 10 minutes
• Functions / Methods have return types and
typed arguments
int sumOfItems(int i, int j)
{
return i + j;
}
• Other types
• void, NULL

62. Obj-C in 10 minutes
• Functions / Methods have return types and
typed arguments
int sumOfItems(int i, int j)
{
return i + j;
}
• Other types
• void, NULL
• pointers to types (int *, void *)

63. Obj-C in 10 minutes

64. Obj-C in 10 minutes
• Objective-C Additions:

65. Obj-C in 10 minutes
• Objective-C Additions:
• BOOL - YES / NO

66. Obj-C in 10 minutes
• Objective-C Additions:
• BOOL - YES / NO
BOOL isSet = YES;

67. Obj-C in 10 minutes
• Objective-C Additions:
• BOOL - YES / NO
BOOL isSet = YES;
• id - strictly a pointer to an object

68. Obj-C in 10 minutes
• Objective-C Additions:
• BOOL - YES / NO
BOOL isSet = YES;
• id - strictly a pointer to an object
• nil - a zero’d out pointer

69. Obj-C in 10 minutes
• Objective-C Additions:
• BOOL - YES / NO
BOOL isSet = YES;
• id - strictly a pointer to an object
• nil - a zero’d out pointer
• nil != (necessarily) NULL or 0

70. Obj-C in 10 minutes

71. Obj-C in 10 minutes
• Classes

72. Obj-C in 10 minutes
• Classes
• Exist as a class pair

73. Obj-C in 10 minutes
• Classes
• Exist as a class pair
• Instance variables and instance methods act
on an instance object

74. Obj-C in 10 minutes
• Classes
• Exist as a class pair
• Instance variables and instance methods act
on an instance object
• Class (static) methods act on the class
object

75. Obj-C in 10 minutes
• Classes
• Exist as a class pair
• Instance variables and instance methods act
on an instance object
• Class (static) methods act on the class
object
• There is only ever one class object at any
given time

76. Obj-C in 10 minutes
• Classes
• Exist as a class pair
• Instance variables and instance methods act
on an instance object
• Class (static) methods act on the class
object
• There is only ever one class object at any
given time
• Class variables really don’t exist

77. Obj-C in 10 minutes
• Classes
#import <Foundation/Foundation.h>
@interface MyClass : NSObject
{
id aChildObject;
NSArray *someItems;
}
+ (NSString *)className;
- (void)logMe;
@property (nonatomic, retain) id aChildObject;
@end

78. Obj-C in 10 minutes
• Classes Include a header
#import <Foundation/Foundation.h>
file
@interface MyClass : NSObject
{
id aChildObject;
NSArray *someItems;
}
+ (NSString *)className;
- (void)logMe;
@property (nonatomic, retain) id aChildObject;
@end

79. Obj-C in 10 minutes
• Classes
#import <Foundation/Foundation.h>
Declare interface
@interface MyClass : NSObject extends
{ NSObject
id aChildObject;
NSArray *someItems;
}
+ (NSString *)className;
- (void)logMe;
@property (nonatomic, retain) id aChildObject;
@end

80. Obj-C in 10 minutes
• Classes
#import <Foundation/Foundation.h>
@interface MyClass : NSObject
{
id aChildObject; Class instance
NSArray *someItems; variables
}
+ (NSString *)className;
- (void)logMe;
@property (nonatomic, retain) id aChildObject;
@end

81. Obj-C in 10 minutes
• Classes
#import <Foundation/Foundation.h>
@interface MyClass : NSObject
{
id aChildObject;
NSArray *someItems;
}
A class (static)
+ (NSString *)className;
- (void)logMe; method
@property (nonatomic, retain) id aChildObject;
@end

82. Obj-C in 10 minutes
• Classes
#import <Foundation/Foundation.h>
@interface MyClass : NSObject
{
id aChildObject;
NSArray *someItems;
}
+ (NSString *)className;
- (void)logMe;
An instance
method
@property (nonatomic, retain) id aChildObject;
@end

83. Obj-C in 10 minutes
• Classes
#import <Foundation/Foundation.h>
@interface MyClass : NSObject
{
id aChildObject;
NSArray *someItems;
}
A declared
+ (NSString *)className; property
- (void)logMe;
@property (nonatomic, retain) id aChildObject;
@end

84. Obj-C in 10 minutes
• Classes
#import <Foundation/Foundation.h>
@interface MyClass : NSObject
{
id aChildObject;
NSArray *someItems;
}
+ (NSString *)className;
- (void)logMe;
@property (nonatomic, retain) id aChildObject;
Close the
@end
interface block

85. Obj-C in 10 minutes
• Classes
#import <Foundation/Foundation.h>
@interface MyClass : NSObject
{
id aChildObject;
NSArray *someItems;
}
+ (NSString *)className;
- (void)logMe;
@property (nonatomic, retain) id aChildObject;
@end

86. Obj-C in 10 minutes
• Classes
#import "MyClass.h"
@implementation MyClass
@synthesize aChildObject;
- (id)init
{
self = [super init];
if (self)
{
someItems = [[NSArray alloc] init];
}
return self;
}

87. Obj-C in 10 minutes
• Classes Include a header
#import "MyClass.h"
file
@implementation MyClass
@synthesize aChildObject;
- (id)init
{
self = [super init];
if (self)
{
someItems = [[NSArray alloc] init];
}
return self;
}

88. Obj-C in 10 minutes
• Classes
#import "MyClass.h"
Begin
@implementation MyClass implementation
@synthesize aChildObject; block
- (id)init
{
self = [super init];
if (self)
{
someItems = [[NSArray alloc] init];
}
return self;
}

89. Obj-C in 10 minutes
• Classes
#import "MyClass.h"
@implementation MyClass
Auto-generate
@synthesize aChildObject;
property
- (id)init
{
self = [super init];
if (self)
{
someItems = [[NSArray alloc] init];
}
return self;
}

90. Obj-C in 10 minutes
• Classes
#import "MyClass.h"
@implementation MyClass
@synthesize aChildObject;
- (id)init Initializer
{ (constructor)
self = [super init];
if (self)
{
someItems = [[NSArray alloc] init];
}
return self;
}

91. Obj-C in 10 minutes
• Classes
#import "MyClass.h"
@implementation MyClass
@synthesize aChildObject;
- (id)init
{
self = [super init];
if (self)
{
someItems = [[NSArray alloc] init];
}
return self;
}

92. Obj-C in 10 minutes
• Classes
#import "MyClass.h"
@implementation MyClass
@synthesize aChildObject;
- (id)init
{
Call to super
self = [super init];
if (self) class
{
someItems = [[NSArray alloc] init];
}
return self;
}

93. Obj-C in 10 minutes
• Classes
#import "MyClass.h"
@implementation MyClass
@synthesize aChildObject;
- (id)init
{
self = [super init]; “new” an array
if (self)
{
someItems = [[NSArray alloc] init];
}
return self;
}

94. Obj-C in 10 minutes
• Classes
#import "MyClass.h"
@implementation MyClass
@synthesize aChildObject;
- (id)init
{
self = [super init];
if (self)
{
someItems = [[NSArray alloc] init];
}
return self;
}

95. Obj-C in 10 minutes
• Continued . . .
- (void)dealloc
{
[aChildObject release];
[someItems release];
[super dealloc];
}
- (void)logMe
{
NSLog(@"MyClass");
}
+ (NSString *)className
{
return NSStringFromClass([self class]);
}
@end

96. Obj-C in 10 minutes
• Continued . . .
- (void)dealloc
{ Destructor
[aChildObject release];
[someItems release];
[super dealloc];
}
- (void)logMe
{
NSLog(@"MyClass");
}
+ (NSString *)className
{
return NSStringFromClass([self class]);
}
@end

97. Obj-C in 10 minutes
• Continued . . .
- (void)dealloc
{
[aChildObject release];
[someItems release];
[super dealloc];
}
- (void)logMe
Instance method
{ implementation
NSLog(@"MyClass");
}
+ (NSString *)className
{
return NSStringFromClass([self class]);
}
@end

98. Obj-C in 10 minutes
• Continued . . .
- (void)dealloc
{
[aChildObject release];
[someItems release];
[super dealloc];
}
- (void)logMe
{
NSLog(@"MyClass"); Class method
} implementation
+ (NSString *)className
{
return NSStringFromClass([self class]);
}
@end

99. Obj-C in 10 minutes
• Continued . . .
- (void)dealloc
{
[aChildObject release];
[someItems release];
[super dealloc];
}
- (void)logMe
{
NSLog(@"MyClass");
}
+ (NSString *)className
{
return NSStringFromClass([self class]); End
} implementation
@end block

100. Obj-C in 10 minutes
• Continued . . .
- (void)dealloc
{
[aChildObject release];
[someItems release];
[super dealloc];
}
- (void)logMe
{
NSLog(@"MyClass");
}
+ (NSString *)className
{
return NSStringFromClass([self class]);
}
@end

101. Obj-C in 10 minutes

102. Obj-C in 10 minutes
• What’s with all the ‘@’ and ‘[ ]’?

103. Obj-C in 10 minutes
• What’s with all the ‘@’ and ‘[ ]’?
•@
• Objective-C keywords
• Initializer for string constants

104. Obj-C in 10 minutes
• What’s with all the ‘@’ and ‘[ ]’?
•@
• Objective-C keywords
• Initializer for string constants
• ‘[]’
• “Send a message to an object”
• Like calling a method, but more dynamic

105. Obj-C in 10 minutes

106. Obj-C in 10 minutes
• Method Calls (messages)

107. Obj-C in 10 minutes
• Method Calls (messages)
• Names are intermixed with arguments:

108. Obj-C in 10 minutes
• Method Calls (messages)
• Names are intermixed with arguments:
• method definition
- (void)setItems:(NSArray *)items childObject:(id)obj;

109. Obj-C in 10 minutes
• Method Calls (messages)
• Names are intermixed with arguments:
• method definition
- (void)setItems:(NSArray *)items childObject:(id)obj;
• method call
[self setItems:[NSArray array] childObject:object];

110. Obj-C in 10 minutes
- (void)setItems:(NSArray *)items childObject:(id)obj;

111. Obj-C in 10 minutes
Return
Type
- (void)setItems:(NSArray *)items childObject:(id)obj;

112. Obj-C in 10 minutes
Return
Type
- (void)setItems:(NSArray *)items childObject:(id)obj;
Method Name

113. Obj-C in 10 minutes
Return
Type Arguments and Types
- (void)setItems:(NSArray *)items childObject:(id)obj;
Method Name

114. Obj-C in 10 minutes
[self setItems:[NSArray array] childObject:object];

115. Obj-C in 10 minutes
Receiver
[self setItems:[NSArray array] childObject:object];

116. Obj-C in 10 minutes
Receiver
[self setItems:[NSArray array] childObject:object];
Method Name

117. Obj-C in 10 minutes
Receiver Arguments
[self setItems:[NSArray array] childObject:object];
Method Name

118. Obj-C in 10 minutes

119. Obj-C in 10 minutes
• Protocols

120. Obj-C in 10 minutes
• Protocols
• Analogous to interfaces
@protocol MyProtocol <NSObject>
- (void)protocolMethod;
@property (nonatomic, retain) NSObject *anObject;
@end

121. Obj-C in 10 minutes
• Protocols
• Analogous to interfaces
@protocol MyProtocol <NSObject>
- (void)protocolMethod;
@property (nonatomic, retain) NSObject *anObject;
@end
• Adopting a protocol
@interface MyClass : NSObject <MyProtocol>

122. Obj-C in 10 minutes
• Categories - Something completely
different
• Add functionality to an existing class
@interface NSString (firstChar)
- (unichar)firstChar;
@end
@implementation NSString (reverse)
- (unichar)firstChar
{
return [self characterAtIndex:0];
}
@end

123. Xcode Tour
• Located in /Developer/Applications

125. Code Editor

126. Navigator

127. Utilities

128. Debug Area

129. Run Controls

130. Status Window (???)

131. Window Configuration

133. Run Controls Status Window (???) Window Configuration
Navigator Code Editor Utilities
Debug Area

134. Hello World

135. Model-View-Controller

136. Model-View-Controller
Model

137. Model-View-Controller
Model View

138. Model-View-Controller
Model Controller View

139. Model
• Defines the data to be displayed in
a view.
• Model objects
• Database
Model
• Web

140. Controller
• Negotiates communication
between the model and the view.
• Controls presentation logic
• Updates the model
Controller
• Reflects those updates on the
view

141. View
• Contains controls and UI Widgets
• Informs the controller of
updates.
View

142. Hello World
Model Controller View
(Hello_WorldViewController) (.xib)
Label
view

143. Hello World
Model Controller View
(Hello_WorldViewController) (.xib)
Label
view

144. Hello World
Model Controller View
(Hello_WorldViewController) (.xib)
Label
view

145. Hello You

146. Hello You
• Basic string handling
• Button control
• TextField control
• Outlets and Actions
• Basic MVC

147. Hello You
Model Controller View
(HelloYouViewController) (.xib)
NSString:
name view
textField textField
label label
buttonTap: button

148. Locations

149. Locations
• CoreLocation
• UITableview
• Delegate Pattern

150. HTML Photo

151. HTML App
• Shows interaction between webview
content and the native development kit.
• Modal View Controllers
• UIImagePickerController

152. The HTML
<html>
<head>
<meta name = "viewport" content = "width = device-width">
</head>
<body>
<h1>Tap for photo</h1>
<input type="button"
value="Get Photo"
onClick="window.location='http://getphoto'"/>
<img width="320" height="200" id="image"/>
</body>
</html>

153. The JavaScript
var image=document.getElementById('image');
image.src = '%@'
• %@ will be replaced by the image url

154. Loading the webview
NSError *error;
NSString *filename = [[NSBundle mainBundle]
pathForResource:@"webview" ofType:@"html"];
NSString *html = [NSString stringWithContentsOfFile:filename
encoding:NSUTF8StringEncoding
error:&error];
[webview loadHTMLString:html baseURL:nil];

155. Intercepting the URL
- (BOOL)webView:(UIWebView *)webView
shouldStartLoadWithRequest:(NSURLRequest *)request
navigationType:(UIWebViewNavigationType)navigationType
{
if ([[[request URL] absoluteString] isEqualToString:@"http://getphoto/"])
{
UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.modalPresentationStyle = UIModalTransitionStyleCoverVertical;
picker.delegate = self;
[self presentModalViewController:picker animated:YES];
return NO;
}
return YES;
}

156. iOS Development
• Web:
pzearfoss@gmail.com
http://zearfoss.wordpress.com
@pzearfoss
http://www.github.com/pzearfoss