This document discusses design patterns for mobile apps. It provides an overview of InfoQ as a news and community site for software development. It then discusses the purpose and strategy of QCon conferences for empowering software development. The document proceeds to discuss topics like Cocoa design patterns, the model-view-controller pattern, building a mobile app, networking with an App.net service, and using command and template patterns.

1. Design Patterns for
Mobile Apps
Thursday, June 13, 13

2. InfoQ.com: News & Community Site
• 750,000 unique visitors/month
• Published in 4 languages (English, Chinese, Japanese and Brazilian
Portuguese)
• Post content from our QCon conferences
• News 15-20 / week
• Articles 3-4 / week
• Presentations (videos) 12-15 / week
• Interviews 2-3 / week
• Books 1 / month
Watch the video with slide
synchronization on InfoQ.com!
http://www.infoq.com/presentations
/mobile-design-patterns

3. Presented at QCon New York
www.qconnewyork.com
Purpose of QCon
- to empower software development by facilitating the spread of
knowledge and innovation
Strategy
- practitioner-driven conference designed for YOU: influencers of
change and innovation in your teams
- speakers and topics driving the evolution and innovation
- connecting and catalyzing the influencers and innovators
Highlights
- attended by more than 12,000 delegates since 2007
- held in 9 cities worldwide

4. Cocoa Design Patterns
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7. NSBrief
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25. Hawtness
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26. 853 apps per day
148apps.biz
January 2013
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27. 133 games per day
148apps.biz
January 2013
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28. Quality Takes Time
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29. Time == $$$
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30. Time Tested Solutions
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36. Thursday, June 13, 13

37. Let’s Build a
Mobile App
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44. Thursday, June 13, 13

45. View
Controller
Model
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46. Thursday, June 13, 13

47. Thursday, June 13, 13

48. MVC
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49. Model View Controller
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50. Model View Controller
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51. Thursday, June 13, 13

52. Thursday, June 13, 13

53. @interface Post : _Post
+ (id) postWithId:(NSNumber *)postId;
- (void) downloadAttachments;
@end
Thursday, June 13, 13

54. Model View Controller
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55. Thursday, June 13, 13

56. Thursday, June 13, 13

57. Model View Controller
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58. ?
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59. MVC
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60. MVC
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61. View
ViewController
Model
View
ViewController
View
ViewController
Thursday, June 13, 13

62. View
ViewController
Model
View
ViewController
View
ViewController
Thursday, June 13, 13

63. View
ViewController
Model
Thursday, June 13, 13

64. MVC can be composed of
MVC (UITextView for
example)
View
ViewController
Model
Thursday, June 13, 13

65. MVC can be composed of
MVC (UITextView for
example)
Database
Visual Control
Network
App.net
View
ViewController
Model
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66. DatabaseVisual Control
Network App.net
ViewController
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67. DatabaseVisual Control
Network App.net
ViewController
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68. Thursday, June 13, 13

69. AppDelegate
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70. AppDelegate
RootViewController
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71. AppDelegate
RootViewController
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72. AppDelegate
RootViewController
ViewController
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73. AppDelegate
RootViewController
ViewController
ViewController
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74. AppDelegate
RootViewController
ViewController
ViewController
ViewController
ViewController
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75. AppDelegate
RootViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
Thursday, June 13, 13

76. AppDelegate
RootViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
Thursday, June 13, 13

77. AppDelegate
RootViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewControlle
wController
iewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewControllerViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
wController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewControlle
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewCo
ViewContr
ViewController
ViewCon
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
ViewController
Thursday, June 13, 13

78. AppDelegate
RootViewController
ViewController
ViewController
ViewController
ViewController
Thursday, June 13, 13

79. AppDelegate
RootViewController
ViewController
ViewController
ViewController
ViewController
App.net
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80. (MyAppDelegate *)[[UIApplication
sharedApplication] delegate]
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81. #define sharedDelegate
(MyAppDelegate *)[[UIApplication sharedApplication] delegate]
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82. AppDelegate
RootViewController
ViewController
ViewController
ViewController
ViewController
App.net
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83. AppDelegate
RootViewController
ViewController
ViewController
ViewController
ViewController
App.net
message
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84. AppDelegate
RootViewController
ViewController
ViewController
ViewController
ViewController
App.net
message
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85. AppDelegate
RootViewController
ViewController
ViewController
ViewController
ViewController
App.net
message
Thursday, June 13, 13

86. AppDelegate
RootViewController
ViewController
ViewController
ViewController
ViewController
App.net
message
Thursday, June 13, 13

87. AppDelegate
RootViewController
ViewController
ViewController
ViewController
ViewController
App.netmessage
Thursday, June 13, 13

88. AppDelegate
RootViewController
ViewController
ViewController
ViewController
ViewController
App.netmessage
Thursday, June 13, 13

89. Chain of Responsibility
Pause here more, explain
more :
What
When to use
Why
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90. Responder Chain
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91. [[UIApplication
sharedApplication]
sendAction:to:from:forEvent:]
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92. @implementation UIView
(FindAndResignFirstResponder)
- (BOOL)findAndResignFirstResponder
{
if ([self isFirstResponder]) {
[self resignFirstResponder];
return YES;
}
for (UIView *subView in [self subviews]) {
if ([subView findAndResignFirstResponder])
return YES;
}
return NO;
}
@end
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93. while ([obj retainCount]) [obj release];
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94. Thursday, June 13, 13

95. Thursday, June 13, 13

96. [[UIApplication sharedApplication]
sendAction:@selector(resignFirstResponder)
to:nil
from:self
forEvent:nil]
Thursday, June 13, 13

97. [[UIApplication sharedApplication]
sendAction:@selector(resignFirstResponder)
to:nil
from:self
forEvent:nil]
Thursday, June 13, 13

98. - (void)viewDidAppear:
Thursday, June 13, 13

99. AppDelegate
RVC
VC
View
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100. AppDelegate
RVC
VC
View
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101. AppDelegate
RVC
VC
View
VC
View
Thursday, June 13, 13

102. AppDelegate
RVC
VC
View
VC
View
Thursday, June 13, 13

103. AppDelegate
RVC
VC
View
VC
View
Thursday, June 13, 13

104. Command
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105. Thursday, June 13, 13

106. - (void)viewDidLoad {
[super viewDidLoad];
// Setting Up Table View
self.tableView = [[UITableView alloc] initWithFrame:CGRectMake(0.0, 0.0, self.view.bounds.size.width,
self.view.bounds.size.height) style:UITableViewStylePlain];
self.tableView.dataSource = self;
self.tableView.delegate = self;
self.tableView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
self.tableView.hidden = YES;
[self.view addSubview:self.tableView];
// Setting Up Activity Indicator View
self.activityIndicatorView = [[UIActivityIndicatorView alloc]
initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
self.activityIndicatorView.hidesWhenStopped = YES;
self.activityIndicatorView.center = self.view.center;
[self.view addSubview:self.activityIndicatorView];
[self.activityIndicatorView startAnimating];
// Initializing Data Source
self.movies = [[NSArray alloc] init];
NSURL *url = [[NSURL alloc] initWithString:@"http://itunes.apple.com/search?term=harry&country=us&entity=movie"];
NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];
AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request
success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {
self.movies = [JSON objectForKey:@"results"];
[self.activityIndicatorView stopAnimating];
[self.tableView setHidden:NO];
[self.tableView reloadData];
} failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) {
NSLog(@"Request Failed with Error: %@, %@", error, error.userInfo);
}];
[operation start];
}
Thursday, June 13, 13

107. - (void)viewDidLoad {
[super viewDidLoad];
// Setting Up Table View
self.tableView = [[UITableView alloc] initWithFrame:CGRectMake(0.0, 0.0, self.view.bounds.size.width,
self.view.bounds.size.height) style:UITableViewStylePlain];
self.tableView.dataSource = self;
self.tableView.delegate = self;
self.tableView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
self.tableView.hidden = YES;
[self.view addSubview:self.tableView];
// Setting Up Activity Indicator View
self.activityIndicatorView = [[UIActivityIndicatorView alloc]
initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
self.activityIndicatorView.hidesWhenStopped = YES;
self.activityIndicatorView.center = self.view.center;
[self.view addSubview:self.activityIndicatorView];
[self.activityIndicatorView startAnimating];
// Initializing Data Source
self.movies = [[NSArray alloc] init];
NSURL *url = [[NSURL alloc] initWithString:@"http://itunes.apple.com/search?term=harry&country=us&entity=movie"];
NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];
AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request
success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {
self.movies = [JSON objectForKey:@"results"];
[self.activityIndicatorView stopAnimating];
[self.tableView setHidden:NO];
[self.tableView reloadData];
} failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) {
NSLog(@"Request Failed with Error: %@, %@", error, error.userInfo);
}];
[operation start];
}
Thursday, June 13, 13

108. // Initializing Data Source
self.movies = [[NSArray alloc] init];
NSURL *url = [[NSURL alloc] initWithString:@"http://itunes.apple.com/search?
term=harry&country=us&entity=movie"];
NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];
AFJSONRequestOperation *operation = [AFJSONRequestOperation
JSONRequestOperationWithRequest:request success:^(NSURLRequest *request,
NSHTTPURLResponse *response, id JSON) {
self.movies = [JSON objectForKey:@"results"];
[self.activityIndicatorView stopAnimating];
[self.tableView setHidden:NO];
[self.tableView reloadData];
} failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError
*error, id JSON) {
NSLog(@"Request Failed with Error: %@, %@", error, error.userInfo);
}];
[operation start];
Thursday, June 13, 13

109. // Initializing Data Source
self.movies = [[NSArray alloc] init];
NSURL *url = [[NSURL alloc] initWithString:@"http://itunes.apple.com/search?
term=harry&country=us&entity=movie"];
NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];
AFJSONRequestOperation *operation = [AFJSONRequestOperation
JSONRequestOperationWithRequest:request success:^(NSURLRequest *request,
NSHTTPURLResponse *response, id JSON) {
self.movies = [JSON objectForKey:@"results"];
[self.activityIndicatorView stopAnimating];
[self.tableView setHidden:NO];
[self.tableView reloadData];
} failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError
*error, id JSON) {
NSLog(@"Request Failed with Error: %@, %@", error, error.userInfo);
}];
[operation start];
Thursday, June 13, 13

110. ^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {
self.movies = [JSON objectForKey:@"results"];
[self.activityIndicatorView stopAnimating];
[self.tableView setHidden:NO];
[self.tableView reloadData];
}
Thursday, June 13, 13

111. ADN Service
Thursday, June 13, 13

112. ADN Service
https://alpha-api.app.net/stream/0/posts/stream
Thursday, June 13, 13

113. ADN Service
https://alpha-api.app.net/stream/0/posts/stream
Thursday, June 13, 13

114. ADN Service
https://alpha-api.app.net/stream/0/posts/stream
POST:
include_reposters=1&include_annotations=1&incl
ude_muted=0&include_starred_by=1
Thursday, June 13, 13

115. ADN Service
Get Personal Stream
Thursday, June 13, 13

116. ADN Service
Get Personal Stream
include_reposters
include_muted
include_annotations
include_starred_by
Thursday, June 13, 13

117. ADN Service
Get Personal Stream
Thursday, June 13, 13

118. ADN Service
Get Personal Stream
Thursday, June 13, 13

119. ADN Service
Get Personal Stream
@property (nonatomic, assign) BOOL includeReposters
@property (nonatomic, assign) BOOL includeAnnotations
@property (nonatomic, assign) BOOL includeStarredBy
@property (nonatomic, assign) BOOL includeMuted
Thursday, June 13, 13

120. ADN Service
@class ADNRetrievePersonalStreamCommand : ADNCommand
@property (nonatomic, assign) BOOL includeReposters
@property (nonatomic, assign) BOOL includeAnnotations
@property (nonatomic, assign) BOOL includeStarredBy
@property (nonatomic, assign) BOOL includeMuted
Thursday, June 13, 13

121. ADN Service
@class ADNRetrievePersonalStreamCommand : ADNCommand
@property (nonatomic, assign) BOOL includeReposters
@property (nonatomic, assign) BOOL includeAnnotations
@property (nonatomic, assign) BOOL includeStarredBy
@property (nonatomic, assign) BOOL includeMuted
@property (nonatomic, copy) NSURL *baseURL;
@class ADNService : UIResponder
Thursday, June 13, 13

122. Get Personal Stream
ADN Service
Thursday, June 13, 13

123. Get Personal StreamADN Service
Thursday, June 13, 13

124. Command
Thursday, June 13, 13

125. ADNCommand
Thursday, June 13, 13

126. ADNCommand
Thursday, June 13, 13

127. ADNPersonalStreamCommand
ADNCommand
Thursday, June 13, 13

128. ADNPersonalStreamCommand
ADNCommand
Thursday, June 13, 13

129. ADNPersonalStreamCommand
ADNCommand
Thursday, June 13, 13

130. ADNPersonalStreamCommand
ADNPostStatusCommand
ADNRetrieveChannelCommand
ADNUserLookupCommand
ADNCommand
Thursday, June 13, 13

131. Template
Thursday, June 13, 13

132. Thursday, June 13, 13

133. //AppDelegate.h
@interface AppDelegate : UIResponder<UIApplicationDelegate>
@property (nonatomic, strong, readwrite) IBOutlet UIWindow *window;
@property (nonatomic, strong, readonly) WebService *webService;
@end
//AppDelegate.m
- (UIResponder *)nextResponder;
{
return self.webService;
}
Thursday, June 13, 13

134. @interface WebService : UIResponder
@property (nonatomic, copy, readonly) NSURL *baseURL;
@property (nonatomic, strong, readonly) TokenStorage *tokenStorage;
//..more properties
- (id) initWithBaseURL:(NSURL *)baseURL;
- (void) sendCommand:(WebServiceCommand *)command;
- (void) presentMessageFromCommand:(NSString *)message;
- (BOOL) isAuthenticated;
- (BOOL) performAction:(SEL)action from:(id)sender;
- (BOOL) performAction:(SEL)action from:(id)sender parameters:
(NSDictionary *)parameters;
+ (BOOL) isNetworkReachable;
@end
Thursday, June 13, 13

135. @interface WebService (Commands)
- (IBAction) loginToService;
- (IBAction) logoutFromService;
- (IBAction) retrieveUsersPersonalStream:(id)sender;
@end
Thursday, June 13, 13

136. - (void) loginToService
{
WebServiceLoginCommand *command = [WebServiceLoginCommand
commandWithService:self];
command.tokenStorage = self.tokenStorage;
command.username = [self.delegate username];
command.password = [self.delegate password];
[command send];
}
Thursday, June 13, 13

137. - (NSString *)username;
{
return [self textValueForCellAtIndexPath:[NSIndexPath
indexPathForRow:0 inSection:0]];
}
- (NSString *)password;
{
return [[self textValueForCellAtIndexPath:[NSIndexPath
indexPathForRow:1 inSection:0]] lowercaseString];
}
- (IBAction) login:(id)sender;
{
if ([[self username] length] && [[self password] length])
{
self.messageLabel.text = @"";
[[UIApplication sharedApplication]
performActionInResponderChain:@selector(resignFirstResponder)
from:self];
[SVProgressHUD showWithStatus:@"Logging in..."
maskType:SVProgressHUDMaskTypeBlack];
}
}
Thursday, June 13, 13

138. - (void) sendCommand:(WebServiceCommand *)command;
{
BOOL commandVerified = [self verifyCommand:command];
if (!commandVerified) return;
if ([self.httpClient networkReachabilityStatus] ==
AFNetworkReachabilityStatusNotReachable)
{
[self.delegate displayMessage:@"No Internet Connection"];
DDLogInfo(@"Not connected to a network");
}
else
{
AFHTTPRequestOperation *operation = [command createRequestOperation];
[self.httpClient enqueueHTTPRequestOperation:operation];
DDLogInfo(@"Sent Command: %@", command);
}
}
Thursday, June 13, 13

139. - (void) sendCommand:(WebServiceCommand *)command;
{
BOOL commandVerified = [self verifyCommand:command];
if (!commandVerified) return;
if ([self.httpClient networkReachabilityStatus] ==
AFNetworkReachabilityStatusNotReachable)
{
[self.delegate displayMessage:@"No Internet Connection"];
DDLogInfo(@"Not connected to a network");
}
else
{
AFHTTPRequestOperation *operation = [command createRequestOperation];
[self.httpClient enqueueHTTPRequestOperation:operation];
DDLogInfo(@"Sent Command: %@", command);
}
}
Thursday, June 13, 13

140. - (void) sendCommand:(WebServiceCommand *)command;
{
BOOL commandVerified = [self verifyCommand:command];
if (!commandVerified) return;
if ([self.httpClient networkReachabilityStatus] ==
AFNetworkReachabilityStatusNotReachable)
{
[self.delegate displayMessage:@"No Internet Connection"];
DDLogInfo(@"Not connected to a network");
}
else
{
AFHTTPRequestOperation *operation = [command createRequestOperation];
[self.httpClient enqueueHTTPRequestOperation:operation];
DDLogInfo(@"Sent Command: %@", command);
}
}
Thursday, June 13, 13

141. [self.delegate displayMessage:@"No Internet Connection"];
DDLogInfo(@"Not connected to a network");
Thursday, June 13, 13

142. AFHTTPRequestOperation *operation = [command
createRequestOperation];
[self.httpClient enqueueHTTPRequestOperation:operation];
DDLogInfo(@"Sent Command: %@", command);
Thursday, June 13, 13

143. ommand
Object
WebService Object
Our App
Actual
Service
Thursday, June 13, 13

144. WebService Object
Our App HTTP Requ
Actual
Service
Thursday, June 13, 13

145. HTTP
Respons
WebService Object
Our App
Actual
Service
Thursday, June 13, 13

146. WebService Object
ble ObjectOur App
Actual
Service
Thursday, June 13, 13

147. Usable Object
Needs to be more clear
Thursday, June 13, 13

148. Needs to be more clear
Usable Object
Thursday, June 13, 13

149. Thursday, June 13, 13

150. NSFetchedResultsController
Thursday, June 13, 13

151. - (void) loadUserStream;
{
self.results = [StreamEvent MR_fetchAllSortedBy:StreamEvent.createdDate
ascending:YES
withPredicate:[self streamFilter]
groupBy:nil
delegate:self
inContext:self.context];
}
Thursday, June 13, 13

152. - (void) loadUserStream;
{
self.results = [StreamEvent MR_fetchAllSortedBy:StreamEvent.createdDate
ascending:YES
withPredicate:[self streamFilter]
groupBy:nil
delegate:self
inContext:self.context];
}
Thursday, June 13, 13

153. NSFetchedResultsControllerDelegate
Thursday, June 13, 13

154. Delegation
Thursday, June 13, 13

155. AbstractTemplate
ConcreteTemplate
Thursday, June 13, 13

156. AbstractTemplate
ConcreteTemplate
Thursday, June 13, 13

157. AbstractTemplate ConcreteTemplate
Thursday, June 13, 13

158. AbstractTemplate ConcreteTemplate
Thursday, June 13, 13

159. - (void)controller:(NSFetchedResultsController *)controller
didChangeObject:(id)anObject
atIndexPath:(NSIndexPath *)theIndexPath
forChangeType:(NSFetchedResultsChangeType)type
newIndexPath:(NSIndexPath *)newIndexPath
- (void)controllerWillChangeContent:(NSFetchedResultsController
*)controller
- (void)controllerDidChangeContent:(NSFetchedResultsController
*)controller
Thursday, June 13, 13

160. switch(type)
{
case NSFetchedResultsChangeInsert:
[tableView insertRowsAtIndexPaths:@[theIndexPath]
withRowAnimation:UITableViewRowAnimationNone];
break;
case NSFetchedResultsChangeDelete:
[self verifyProductPredicate:anObject];
[tableView deleteRowsAtIndexPaths:@[theIndexPath]
withRowAnimation:UITableViewRowAnimationFade];
break;
case NSFetchedResultsChangeUpdate:
{
id object = [self.results objectAtIndexPath:theIndexPath];
[self configureCell:(id)[tableView
cellForRowAtIndexPath:theIndexPath] forObject:object];
}
break;
case NSFetchedResultsChangeMove:
[tableView deleteRowsAtIndexPaths:@[theIndexPath]
withRowAnimation:UITableViewRowAnimationFade];
[tableView insertRowsAtIndexPaths:@[theIndexPath]
withRowAnimation:UITableViewRowAnimationFade];
break;
}
Thursday, June 13, 13

161. Observer
Last steps from
controller to view with
observer pattern
Thursday, June 13, 13

162. Model
Controller
View
Thursday, June 13, 13

163. Composite
Command
Mediator
Strategy
Observer
Thursday, June 13, 13

164. Model
ViewController
View
Thursday, June 13, 13

165. Model
ViewController
View
Thursday, June 13, 13

166. Model
ViewController
View
Thursday, June 13, 13

167. Model
ViewController
View
Thursday, June 13, 13

168. Model
ViewController
View
Thursday, June 13, 13

169. Touch Interface
View
ViewController
App.net App.net
AppDelegate CoreData
Thursday, June 13, 13

170. Touch Interface
View
ViewController
App.net App.net
AppDelegate CoreData
Thursday, June 13, 13

171. Touch Interface
View
ViewController
App.net App.net
AppDelegate CoreData
Thursday, June 13, 13

172. Touch Interface
View
ViewController
App.net App.net
AppDelegate CoreData
Thursday, June 13, 13

173. Touch Interface
View
ViewController
App.net App.net
AppDelegate CoreData
Thursday, June 13, 13

174. Touch Interface
View
ViewController
App.net App.net
AppDelegate CoreData
Thursday, June 13, 13

175. Touch Interface
View
ViewController
App.net App.net
AppDelegate CoreData
Thursday, June 13, 13

176. Touch Interface
View
ViewController
App.net App.net
AppDelegate CoreData
Thursday, June 13, 13

177. Touch Interface
View
ViewController
App.net App.net
AppDelegate CoreData
Thursday, June 13, 13

178. Touch Interface
View
ViewController
App.net App.net
AppDelegate CoreData
Thursday, June 13, 13

179. Touch Interface
View
ViewController
App.net App.net
AppDelegate CoreData
Thursday, June 13, 13

180. Touch Interface
View
ViewController
App.net App.net
AppDelegate CoreData
Thursday, June 13, 13

181. Pattern Abuse
Thursday, June 13, 13

182. Factory
Thursday, June 13, 13

183. Abstract Factories
Thursday, June 13, 13

184. Two-Stage Creation
Thursday, June 13, 13

185. [[MyClass alloc] init]
Thursday, June 13, 13

186. NSClassFromString
Thursday, June 13, 13

187. [NSClassFromString(@”MyClass”) alloc] init]
Thursday, June 13, 13

188. Singletons
More explanation in
slides
Thursday, June 13, 13

189. Singletons
More explanation in
slides
Thursday, June 13, 13

190. More explanation in
slides
Thursday, June 13, 13

191. Thursday, June 13, 13

192. Thursday, June 13, 13

193. Singleton
ViewController AppDelegate
Thursday, June 13, 13

194. Singleton
ViewController AppDelegate
Thursday, June 13, 13

195. Singleton
ViewController
AppDelegate
Model ObjectNetwork
Web Service
Thursday, June 13, 13

196. Singleton
ViewController
AppDelegate
Model ObjectNetwork
Web Service
Thursday, June 13, 13

197. Singleton
ViewController
AppDelegate
Model ObjectNetwork
Web Service
Thursday, June 13, 13

198. Singleton
ViewController
AppDelegate
Model ObjectNetwork
Web ServiceWeb ServiceWeb Service
ViewControllerViewControllerViewControllerViewControllerViewController
Model ObjectModel ObjectModel ObjectModel ObjectModel ObjectModel Object
Thursday, June 13, 13

199. Singleton
Thursday, June 13, 13

200. Singleton
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201. AppDelegate
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202. Singleton Manager
AppDelegate
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203. Singleton Manager
AppDelegate
Singleton
Singleton
Singleton
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204. Singleton ManagerAppDelegate
-instanceForClass:[Singleton class]
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205. Singleton ManagerAppDelegate
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206. Singleton ManagerAppDelegate
-destroyInstanceForClass:[Singleton class]
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207. Singleton ManagerAppDelegate
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208. SingletonSingleton ManagerAppDelegate
ViewController
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209. Singleton
Singleton ManagerAppDelegate
ViewController
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210. ServiceLocator
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211. Classes are objects too...
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212. @property Class dateCreator;
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213. [self.dateCreator date];
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215. Thursday, June 13, 13

216. Thursday, June 13, 13

217. Thursday, June 13, 13

218. Thursday, June 13, 13

219. Thursday, June 13, 13

220. Thursday, June 13, 13

221. It was important, his
father said, to craft the
backs of cabinets and
fences properly, even
though they were hidden.
Steve Jobs by Walter Isaacson
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222. “He loved doing things
right. He even cared
about the look of the
parts you couldn’t see.”
- Steve Jobs
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223. saul@magicalpanda.com
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