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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Mobile App Development with iPhone and Rails</title>
<meta http-equiv="content-type" content="text/html;charset=UTF-8" />
<!-- metadata -->
<meta name="generator" content="S5" />
<meta name="version" content="S5 1.1" />
<meta name="presdate" content="June 6, 2010" />
<meta name="author" content="Mike Clark" />
<meta name="company" content="The Pragmatic Studio" />
<!-- configuration parameters -->
<meta name="defaultView" content="slideshow" />
<meta name="controlVis" content="hidden" />
<!-- style sheet links -->
<link rel="stylesheet" href="../assets/ui/default/slides.css" type="text/css" media="projection" id="slideProj" />
<link rel="stylesheet" href="../assets/ui/default/outline.css" type="text/css" media="screen" id="outlineStyle" />
<link rel="stylesheet" href="../assets/stylesheets/print.css" type="text/css" media="print" id="slidePrint" />
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<!-- Syntax Highlighter -->
<link rel="stylesheet" href="../assets/syntaxhighlighter/styles/shCore.css" type="text/css" />
<link rel="stylesheet" href="../assets/syntaxhighlighter/styles/shThemeStudio.css" type="text/css" />
<link rel="stylesheet" href="../assets/stylesheets/pressie.css" type="text/css" />
<!-- S5 JS -->
<script src="../assets/ui/default/slides.js" type="text/javascript"></script>
</head>
<body>
<div class="layout">
<div id="controls"><!-- DO NOT EDIT --></div>
<div id="currentSlide"><!-- DO NOT EDIT --></div>
<div id="header"></div>
<div id="footer">
<h2>Copyright © 2010 The Pragmatic Studio</h2>
</div>
</div>
<div class="presentation">
<div class="slide"><h1>Mobile App Development with iPhone and Rails</h1>
<blockquote>
<p>Mike Clark</p>
</blockquote>
</div>
<div class="slide"><h1>Contents</h1>
<div style="font-size: 70%">
<ul>
<li>Welcome!</li>
</ul>
<ul>
<li>Getting Started: Rails App</li>
</ul>
<ul>
<li>Getting Started: iPhone App</li>
</ul>
<ul>
<li>Fetching Remote Goals</li>
</ul>
<ul>
<li>Roll Your Own <span class="caps">REST</span> Library</li>
</ul>
<ul>
<li>Asynchronous Networking</li>
</ul>
<ul>
<li>Off-The-Shelf <span class="caps">REST</span> Library</li>
</ul>
<ul>
<li>Nested Resources</li>
</ul>
<ul>
<li>Authentication</li>
</ul>
<ul>
<li>Caching and Syncing</li>
</ul>
<ul>
<li>What About the iPad?</li>
</ul>
<ul>
<li>Wrap Up</li>
</ul>
</div>
</div>
<div class="title slide">
<h1>Welcome!</h1>
</div>
<div class="slide"><h1>Copyright and Warranty</h1>
<p>This workbook is Copyright © 2010 The Pragmatic Studio. Please don’t use it to create training courses or books without permission.<br />
<br />
Sample code is provided for educational purposes only, and comes with absolutely no warranty.</p>
</div>
<div class="slide"><h1>What We’ll Build</h1>
<p><img src="../assets/images/final-iphone-app.png" alt="" /></p>
<div style="color: #B1B1B1; text-align: center; font-size: 1em;">
connected to a <a href="http://saveup.heroku.com">Rails App</a>
</div>
</div>
<div class="slide"><h1>How We’ll Build It</h1>
<ol class="incremental">
<li>Incrementally, with stopping off points</li>
<li>Focusing on first principles</li>
<li>Live coding at first, using existing code later</li>
<li>At the end, you’ll know your options</li>
<li>And you’ll understand how they work</li>
</ol>
</div>
<div class="slide"><h1>Workbook Navigation</h1>
<p class="first">This is <strong>your</strong> workbook—follow along now, or work through it later.</p>
<ul>
<li>Next slide
<ul>
<li>space bar, enter/return, right arrow, or down arrow</li>
</ul></li>
</ul>
<ul>
<li>Previous slide
<ul>
<li>left arrow, up arrow</li>
</ul></li>
</ul>
<ul>
<li>Jump to slide number:
<ul>
<li>Type slide number, then enter/return</li>
</ul></li>
</ul>
<ul>
<li>Toggle between slideshow and outline view:
<ul>
<li>T</li>
</ul></li>
</ul>
<ul>
<li>Toggle controls:
<ul>
<li>C</li>
</ul></li>
</ul>
</div>
<div class="title slide">
<h1>Getting Started: Rails App</h1>
</div>
<div class="slide"><h1>Task: Scaffold App</h1>
<p><img src="../assets/images/scaffold.png" alt="" /></p>
</div>
<div class="slide"><h1 class="exercise">1. Create the App</h1>
<p class="first">Generate a basic scaffold app:</p>
<div class="code-normal">
<pre name="code" class="brush: session">$ rails saveup
$ cd saveup
$ rails g scaffold goal name:string amount:decimal</pre></div>
<p>Run it:</p>
<div class="code-normal">
<pre name="code" class="brush: session">$ rake db:migrate
$ rails s</pre></div>
<p>And <a href="http://localhost:3000/goals">create a goal or two</a>…</p>
</div>
<div class="slide"><h1>Serialization</h1>
<p class="first">ActiveRecord models can serialize themselves as <span class="caps">XML</span> or <span class="caps">JSON</span>:</p>
<div class="code-normal">
<pre name="code" class="brush: session">$ rails c
>> print Goal.first.to_xml
>> print Goal.first.to_json
>> print Goal.all.to_xml
>> print Goal.all.to_json</pre></div>
<p>And resources can be serialized as <span class="caps">XML</span> over <span class="caps">HTTP</span>:</p>
<div class="code-normal">
<pre name="code" class="brush: session">$ curl http://localhost:3000/goals.xml
$ curl http://localhost:3000/goals/1.xml</pre></div>
</div>
<div class="slide"><h1 class="exercise">2. Serialize resources as <span class="caps">JSON</span></h1>
<p class="first">Add <span class="caps">JSON</span> handling to the <code>respond_to</code> blocks in the actions of the <code>GoalsController</code>:</p>
<div class="code-normal">
<pre name="code" class="brush: ruby; highlight: 7">def index
@goals = Goal.all
respond_to do |format|
format.html
format.xml { render :xml => @goals }
format.json { render :json => @goals }
end
end</pre></div>
<p>Copy in <code>code/staged/goals_controller.rb</code> for full <span class="caps">JSON</span> support</p>
</div>
<div class="slide"><h1 class="exercise">3. Try It!</h1>
<p class="first">Request the resource with a <code>json</code> format:</p>
<div class="code-normal">
<pre name="code" class="brush: session">$ curl http://localhost:3000/goals.json
$ curl http://localhost:3000/goals/1.json</pre></div>
<p>Response should be a <span class="caps">JSON</span> record, or an array of records:</p>
<div class="code-normal">
<pre name="code" class="brush: ruby">{
"id":1,
"name":"Tropical Vacation",
"amount":2000.0,
"created_at":"2010-05-13T18:20:49Z",
"updated_at":"2010-05-13T18:38:55Z"
}</pre></div>
</div>
<div class="title slide">
<h1>Getting Started: iPhone App</h1>
</div>
<div class="slide"><h1>Task: Table-Based App</h1>
<p><img src="../assets/images/basic-table-view-delete.png" alt="" /></p>
</div>
<div class="slide"><h1>Steps</h1>
<ol>
<li>Create an empty table-view app</li>
<li>Use an array as the backing store for the table</li>
<li>Populate the table with hard-coded goals</li>
<li>Handle deleting goals</li>
</ol>
</div>
<div class="slide"><h1 class="exercise">1. Create the App</h1>
<ol>
<li>Create a new <em>Navigation-based Application</em> (without Core Data)
<ul>
<li>name the project <em>SaveUp</em></li>
</ul></li>
<li>Set the <em>Active <span class="caps">SDK</span></em> to <em>iPhone Simulator (3.1.3)</em></li>
<li>Rename <code>RootViewController</code> to <code>GoalsViewController</code>
<ul>
<li>use Xcode refactoring (<code>⇧ ⌘ J</code>)</li>
</ul></li>
<li><em>Build and Run</em> the app as a sanity check
<ul>
<li>should see an empty table view</li>
</ul></li>
</ol>
</div>
<div class="slide"><h1>Table View Data Source Methods</h1>
<p class="first">How many sections in the table?</p>
<div class="code-medium">
<pre name="code" class="brush: objc">- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView;</pre></div>
<p>How many rows per section?</p>
<div class="code-medium">
<pre name="code" class="brush: objc">- (NSInteger)tableView:(UITableView *)tableView
numberOfRowsInSection:(NSInteger)section;</pre></div>
<p>What’s the table cell for a given section/row pair?</p>
<div class="code-medium">
<pre name="code" class="brush: objc">- (UITableViewCell *)tableView:(UITableView *)tableView
cellForRowAtIndexPath:(NSIndexPath *)indexPath;</pre></div>
</div>
<div class="slide"><h1 class="exercise">2. Set Up Table Data</h1>
<p class="first">Add a <code>goals</code> instance variable and property to the <code>.h</code> file:</p>
<div class="code-small">
<pre name="code" class="brush: ruby">@interface GoalsViewController : UITableViewController {
NSMutableArray *goals;
}
@property (nonatomic, retain) NSArray *goals;
@end
</pre><p></div><div class="codeurl"><a href="txmt://open?url=file:///Users/mike/work/projects/iphone-rails-tutorial/code/1-bootstrap/Classes/GoalsViewController.h">../code/1-bootstrap/Classes/GoalsViewController.h</a></div></p>
<p>Synthesize and dealloc it in the <code>.m</code> file:</p>
<div class="code-small">
<pre name="code" class="brush: ruby">@synthesize goals;
- (void)dealloc {
[goals release];
[super dealloc];
}
</pre><p></div><div class="codeurl"><a href="txmt://open?url=file:///Users/mike/work/projects/iphone-rails-tutorial/code/1-bootstrap/Classes/GoalsViewController.m">../code/1-bootstrap/Classes/GoalsViewController.m</a></div></p>
</div>
<div class="slide"><h1 class="exercise">3. Hard-Code Some Goals</h1>
<p class="first">Change the <code>viewDidLoad</code> method to initialize the <code>goals</code> array:</p>
<div class="code-medium">
<pre name="code" class="brush: ruby; highlight: [7,8,9,10]">- (void)viewDidLoad {
[super viewDidLoad];
self.title = @"Goals";
self.navigationItem.leftBarButtonItem = self.editButtonItem;
NSMutableArray *data = [[NSMutableArray alloc]
initWithObjects:@"iPad", @"Vacation", @"Donation", nil];
self.goals = data;
[data release];
}
</pre><p></div><div class="codeurl"><a href="txmt://open?url=file:///Users/mike/work/projects/iphone-rails-tutorial/code/1-bootstrap/Classes/GoalsViewController.m">../code/1-bootstrap/Classes/GoalsViewController.m</a></div></p>
</div>
<div class="slide"><h1 class="exercise">4. Populate the Table Rows</h1>
<p class="first">Use the size of the <code>goals</code> array as the number of rows:</p>
<div class="code-medium">
<pre name="code" class="brush: ruby">- (NSInteger)tableView:(UITableView *)tableView
numberOfRowsInSection:(NSInteger)section {
return [goals count];
}
</pre><p></div><div class="codeurl"><a href="txmt://open?url=file:///Users/mike/work/projects/iphone-rails-tutorial/code/1-bootstrap/Classes/GoalsViewController.m">../code/1-bootstrap/Classes/GoalsViewController.m</a></div></p>
<p>Configure a row’s cell to contain the name of the goal at the given row:</p>
<div class="code-medium">
<pre name="code" class="brush: ruby"> NSString *goal = [goals objectAtIndex:indexPath.row];
cell.textLabel.text = goal;
</pre><p></div><div class="codeurl"><a href="txmt://open?url=file:///Users/mike/work/projects/iphone-rails-tutorial/code/1-bootstrap/Classes/GoalsViewController.m">../code/1-bootstrap/Classes/GoalsViewController.m</a></div></p>
</div>
<div class="slide"><h1 class="exercise">5. Run It!</h1>
<p><img src="../assets/images/basic-table-view.png" alt="" /></p>
</div>
<div class="slide"><h1 class="exercise">6. Handle Deleting Goals</h1>
<p class="first">Remove the deleted goal from the <code>goals</code> array:</p>
<div class="code-medium">
<pre name="code" class="brush: ruby; highlight: 7">- (void)tableView:(UITableView *)tableView
commitEditingStyle:(UITableViewCellEditingStyle)editingStyle
forRowAtIndexPath:(NSIndexPath *)indexPath {
[tableView beginUpdates];
if (editingStyle == UITableViewCellEditingStyleDelete) {
[goals removeObjectAtIndex:indexPath.row];
[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath]
withRowAnimation:UITableViewRowAnimationFade];
}
[tableView endUpdates];
}
</pre><p></div><div class="codeurl"><a href="txmt://open?url=file:///Users/mike/work/projects/iphone-rails-tutorial/code/1-bootstrap/Classes/GoalsViewController.m">../code/1-bootstrap/Classes/GoalsViewController.m</a></div></p>
</div>
<div class="slide"><h1 class="exercise">7. Delete a Goal</h1>
<p><img src="../assets/images/deleting-rows.png" alt="" /></p>
<div class="hint">
At this point, we’ve replicated the app in <code>code/1-bootstrap</code>
</div>
</div>
<div class="title slide">
<h1>Fetching Remote Goals</h1>
</div>
<div class="slide"><h1>Task: Populate Table from <span class="caps">API</span></h1>
<p><img src="../assets/images/fetching-goals.png" alt="" /></p>
</div>
<div class="slide"><h1>Steps</h1>
<ol>
<li>Request the goals from the <span class="caps">API</span> as <span class="caps">JSON</span></li>
<li>Deserialize them into <code>Goal</code> objects</li>
<li>Refresh the table view</li>
<li>Configure the table view cells</li>
</ol>
</div>
<div class="slide"><h1>Simple <span class="caps">GET</span> request</h1>
<div class="code-medium">
<pre name="code" class="brush: ruby"> NSURL *url = [NSURL URLWithString:@"http://localhost:3000/goals.json"];
NSError *error = nil;
NSString *jsonString =
[NSString stringWithContentsOfURL:url
encoding:NSUTF8StringEncoding
error:&error];
</pre><p></div><div class="codeurl"><a href="txmt://open?url=file:///Users/mike/work/projects/iphone-rails-tutorial/code/2-json/Classes/Goal.m">../code/2-json/Classes/Goal.m</a></div></p>
<p><em>Synchronously</em> reads data from the <span class="caps">URL</span> and creates a string, interpreted using the encoding.</p>
</div>
<div class="slide"><h1>Parsing <span class="caps">JSON</span></h1>
<ul>
<li><a href="http://code.google.com/p/json-framework/">json-framework</a> is a strict <span class="caps">JSON</span> parser and generator</li>
</ul>
<ul>
<li>Drop-dead simple to use:</li>
</ul>
<div class="code-medium">
<pre name="code" class="brush: objc">#import "SBJSON.h"
NSError *error = nil;
SBJSON *json = [[SBJSON alloc] init];
NSArray *results = [json objectWithString:aJsonString error:&error];
[json release];</pre></div>
<ul>
<li>Returns an <code>NSDictionary</code> if the <span class="caps">JSON</span> string has one record</li>
<li>Returns an <code>NSArray</code> of <code>NSDictionary</code> objects if the <span class="caps">JSON</span> string has multiple records</li>
</ul>
</div>
<div class="slide"><h1 class="exercise">1. Add the json-framework library</h1>
<ol>
<li>Use Finder to locate the <code>code/staged/json-framework</code> directory</li>
<li>Drag and drop it on the <em>Classes</em> group in the <em>Groups & Files</em> menu of your Xcode project
<ul>
<li>Make sure to select the <em>Copy items into destination group’s folder</em> option</li>
</ul></li>
</ol>
</div>
<div class="slide"><h1 class="exercise">2. Create a Goal Class (.h)</h1>
<p class="first"><code>Goal</code> is a client-side representation of the <code>Goal</code> resource on the server:</p>
<div class="code-small">
<pre name="code" class="brush: ruby">@interface Goal : NSObject {
NSString *name;
NSString *amount;
NSString *goalId;
NSDate *createdAt;
NSDate *updatedAt;
}
@property (nonatomic, copy) NSString *name;
@property (nonatomic, copy) NSString *amount;
@property (nonatomic, copy) NSString *goalId;
@property (nonatomic, retain) NSDate *createdAt;
@property (nonatomic, retain) NSDate *updatedAt;
- (id)initWithDictionary:(NSDictionary *)dictionary;
+ (NSArray *)findAllRemote;
@end
</pre><p></div><div class="codeurl"><a href="txmt://open?url=file:///Users/mike/work/projects/iphone-rails-tutorial/code/2-json/Classes/Goal.h">../code/2-json/Classes/Goal.h</a></div></p>
</div>
<div class="slide"><h1 class="exercise">2. Create a Goal Class (.m)</h1>
<p class="first">Don’t forget to synthesize and dealloc the properties:</p>
<div class="code-small">
<pre name="code" class="brush: ruby">#import "Goal.h"
#import "SBJSON.h"
@implementation Goal
@synthesize name;
@synthesize amount;
@synthesize goalId;
@synthesize createdAt;
@synthesize updatedAt;
- (void)dealloc {
[name release];
[amount release];
[goalId release];
[createdAt release];
[updatedAt release];
[super dealloc];
}
@end
</pre><p></div><div class="codeurl"><a href="txmt://open?url=file:///Users/mike/work/projects/iphone-rails-tutorial/code/2-json/Classes/Goal.m">../code/2-json/Classes/Goal.m</a></div></p>
</div>
<div class="slide"><h1 class="exercise">3. Add a Goal Custom Initializer</h1>
<p class="first">We need to be able to create a <code>Goal</code> from a dictionary:</p>
<div class="code-medium">
<pre name="code" class="brush: ruby">- (id)initWithDictionary:(NSDictionary *)dictionary {
if (self = [super init]) {
self.name = [dictionary valueForKey:@"name"];
self.amount = [NSString stringWithFormat:@"%@",
[dictionary valueForKey:@"amount"]];
self.goalId = [dictionary valueForKey:@"id"];
self.createdAt = [dictionary valueForKey:@"created_at"];
self.updatedAt = [dictionary valueForKey:@"updated_at"];
}
return self;
}
</pre><p></div><div class="codeurl"><a href="txmt://open?url=file:///Users/mike/work/projects/iphone-rails-tutorial/code/2-json/Classes/Goal.m">../code/2-json/Classes/Goal.m</a></div></p>
</div>
<div class="slide"><h1 class="exercise">3. Add a Goal Finder Method</h1>
<p class="first">Send a <span class="caps">GET</span> request, parse the <span class="caps">JSON</span> response, and create <code>Goal</code> objects:</p>
<div class="code-small">
<pre name="code" class="brush: ruby">+ (NSArray *)findAllRemote {
NSURL *url = [NSURL URLWithString:@"http://localhost:3000/goals.json"];
NSError *error = nil;
NSString *jsonString =
[NSString stringWithContentsOfURL:url
encoding:NSUTF8StringEncoding
error:&error];
NSMutableArray *goals = [NSMutableArray array];
if (jsonString) {
SBJSON *json = [[SBJSON alloc] init];
NSArray *results = [json objectWithString:jsonString error:&error];
[json release];
for (NSDictionary *dictionary in results) {
Goal *goal = [[Goal alloc] initWithDictionary:dictionary];
[goals addObject:goal];
[goal release];
}
}
return goals;
}
</pre><p></div><div class="codeurl"><a href="txmt://open?url=file:///Users/mike/work/projects/iphone-rails-tutorial/code/2-json/Classes/Goal.m">../code/2-json/Classes/Goal.m</a></div></p>
</div>
<div class="slide"><h1 class="exercise">4. Refresh the Table View</h1>
<p class="first">Add a <code>refresh</code> action that fetches the goals and reloads the table:</p>
<div class="code-small">
<pre name="code" class="brush: ruby; highlight: 3">- (IBAction)refresh {
[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
self.goals = [Goal findAllRemote];
[self.tableView reloadData];
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
}
</pre><p></div><div class="codeurl"><a href="txmt://open?url=file:///Users/mike/work/projects/iphone-rails-tutorial/code/2-json/Classes/GoalsViewController.m">../code/2-json/Classes/GoalsViewController.m</a></div></p>
<p class="first">Call <code>refresh</code> when the view is loaded:</p>
<div class="code-small">
<pre name="code" class="brush: ruby; highlight: 7">- (void)viewDidLoad {
[super viewDidLoad];
self.title = @"Goals";
self.navigationItem.leftBarButtonItem = self.editButtonItem;
[self refresh];
}
</pre><p></div><div class="codeurl"><a href="txmt://open?url=file:///Users/mike/work/projects/iphone-rails-tutorial/code/2-json/Classes/GoalsViewController.m">../code/2-json/Classes/GoalsViewController.m</a></div></p>
</div>
<div class="slide"><h1 class="exercise">5. Configure the Table Cells</h1>
<p class="first">Change each row to contain the respective goal’s name and amount:</p>
<div class="code-medium">
<pre name="code" class="brush: ruby; highlight: [13,14,15,16]"> Goal *goal = [goals objectAtIndex:indexPath.row];
cell.textLabel.text = goal.name;
cell.detailTextLabel.text = goal.amount;
</pre><p></div><div class="codeurl"><a href="txmt://open?url=file:///Users/mike/work/projects/iphone-rails-tutorial/code/2-json/Classes/GoalsViewController.m">../code/2-json/Classes/GoalsViewController.m</a></div></p>
</div>
<div class="slide"><h1 class="exercise">6. Add a Refresh Button</h1>
<p class="first">The refresh button messages our <code>refresh</code> action:</p>
<div class="code-medium">
<pre name="code" class="brush: ruby; highlight: [7,8,9,10,11,12]">- (void)viewDidLoad {
[super viewDidLoad];
self.title = @"Goals";
self.navigationItem.leftBarButtonItem = self.editButtonItem;
UIBarButtonItem *refreshButton = [[UIBarButtonItem alloc]
initWithBarButtonSystemItem:UIBarButtonSystemItemRefresh
target:self
action:@selector(refresh)];
self.navigationItem.rightBarButtonItem = refreshButton;
[refreshButton release];
[self refresh];
}
</pre><p></div><div class="codeurl"><a href="txmt://open?url=file:///Users/mike/work/projects/iphone-rails-tutorial/code/2-json/Classes/GoalsViewController.m">../code/2-json/Classes/GoalsViewController.m</a></div></p>
</div>
<div class="slide"><h1 class="exercise">7. Run It!</h1>
<ol>
<li>Add a goal (or two) in the Rails app</li>
<li>Hit the <em>Refresh</em> button in the iPhone app</li>
<li>The table view should reload with new goals</li>
<li>What happens when you delete a goal on the iPhone, then refresh?</li>
</ol>
<div class="hint">
At this point, we’ve replicated the app in <code>code/2-json</code>
</div>
</div>
<div class="title slide">
<h1>Roll Your Own <span class="caps">REST</span> Library</h1>
</div>
<div class="slide"><h1>Task: <span class="caps">CRUD</span> a Resource</h1>
<p><img src="../assets/images/table-crud-remote.png" alt="" /></p>
</div>
<div class="slide"><h1 class="exercise">1. Level Up!</h1>
<ol>
<li>Switch to the iPhone app in the <code>code/3-scaffold</code> directory</li>
<li>Run it!
<ul>
<li>It supports adding new goals locally and updating local goals</li>
<li>But it doesn’t support creating, updating, and deleting remote goals</li>
</ul></li>
<li>Search for <span class="caps">TODO</span> to see why</li>
</ol>
</div>
<div class="slide"><h1>Steps</h1>
<ol>
<li>Write a custom <span class="caps">REST</span> library</li>
<li>Change <code>Goal</code> to include <span class="caps">CRUD</span> methods that delegate to the library</li>
<li>Update <code>GoalsViewController</code> to delete a remote goal</li>
<li>Update <code>GoalAddViewController</code> to create or update a remote goal</li>
</ol>
</div>
<div class="slide"><h1>Synchronous Networking Basics</h1>
<p class="first">1. Create a request from a <span class="caps">URL</span>:</p>
<div class="code-small">
<pre name="code" class="brush: objc">NSURL *url = [NSURL URLWithString:@"http://localhost:3000/goals.json"];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
[request setHTTPMethod:@"GET"];</pre></div>
<p>2. Send the request synchronously:</p>
<div class="code-small">
<pre name="code" class="brush: objc">NSURLResponse *response = nil;
NSError *error = nil;
NSData *responseData =
[NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];</pre></div>
<p>3. Handle the returned data:</p>
<div class="code-small">
<pre name="code" class="brush: objc">NSString *responseString =
[[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding]; </pre></div>
</div>
<div class="slide"><h1>Custom Resource Library</h1>
<p class="first">To support <span class="caps">CRUD</span>, we need four standard verbs:</p>
<div class="code-normal">
<pre name="code" class="brush: ruby">#import <Foundation/Foundation.h>
@interface Resource : NSObject {
}
+ (NSString *)get:(NSString *)url;
+ (NSString *)post:(NSString *)body to:(NSString *)url;
+ (NSString *)put:(NSString *)body to:(NSString *)url;
+ (NSString *)delete:(NSString *)url;
@end
</pre><p></div><div class="codeurl"><a href="txmt://open?url=file:///Users/mike/work/projects/iphone-rails-tutorial/code/3-scaffold/Classes/Resource.h">../code/3-scaffold/Classes/Resource.h</a></div></p>
</div>
<div class="slide"><h1><span class="caps">REST</span> Verbs</h1>
<p class="first">Implementation can be generalized:</p>
<div class="code-medium">
<pre name="code" class="brush: ruby">+ (NSString *)get:(NSString *)url {
return [self sendBy:@"GET" to:url withBody:nil];
}
+ (NSString *)post:(NSString *)body to:(NSString *)url {
return [self sendBy:@"POST" to:url withBody:body];
}
+ (NSString *)put:(NSString *)body to:(NSString *)url {
return [self sendBy:@"PUT" to:url withBody:body];
}
+ (NSString *)delete:(NSString *)url {
return [self sendBy:@"DELETE" to:url withBody:nil];
}
</pre><p></div><div class="codeurl"><a href="txmt://open?url=file:///Users/mike/work/projects/iphone-rails-tutorial/code/3-scaffold/Classes/Resource.m">../code/3-scaffold/Classes/Resource.m</a></div></p>
</div>
<div class="slide"><h1>Synchronous Networking Revisted</h1>
<div class="code-small">
<pre name="code" class="brush: ruby">+ (NSString *)sendBy:(NSString *)method to:(NSString *)url withBody:(NSString *)body {
NSMutableURLRequest *request =
[NSMutableURLRequest requestWithURL:[NSURL URLWithString:url]];
[request setHTTPMethod:method];
if (body) {
[request setHTTPBody:[body dataUsingEncoding:NSUTF8StringEncoding]];
[request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
}
return [self sendRequest:request];
}
+ (NSString *)sendRequest:(NSMutableURLRequest *)request {
NSHTTPURLResponse *response;
NSError *error;
NSData *responseData =
[NSURLConnection sendSynchronousRequest:request
returningResponse:&response
error:&error];
NSString *responseString =
[[NSString alloc] initWithData:responseData
encoding:NSUTF8StringEncoding];
[responseString autorelease];
return responseString;
}
</pre><p></div><div class="codeurl"><a href="txmt://open?url=file:///Users/mike/work/projects/iphone-rails-tutorial/code/3-scaffold/Classes/Resource.m">../code/3-scaffold/Classes/Resource.m</a></div></p>
</div>
<div class="slide"><h1 class="exercise">2. Change Goal (.h)</h1>
<p class="first">Define new <span class="caps">CRUD</span> methods:</p>
<div class="code-small">
<pre name="code" class="brush: ruby; highlight: [17,18,19,20,21]">@interface Goal : NSObject {
NSString *name;
NSString *amount;
NSString *goalId;
NSDate *createdAt;
NSDate *updatedAt;
}
@property (nonatomic, copy) NSString *name;
@property (nonatomic, copy) NSString *amount;
@property (nonatomic, copy) NSString *goalId;
@property (nonatomic, retain) NSDate *createdAt;
@property (nonatomic, retain) NSDate *updatedAt;
- (id)initWithDictionary:(NSDictionary *)dictionary;
+ (NSArray *)findAllRemote;
- (void)createRemote;
- (void)updateRemote;
- (void)saveRemote;
- (void)destroyRemote;
@end
</pre><p></div><div class="codeurl"><a href="txmt://open?url=file:///Users/mike/work/projects/iphone-rails-tutorial/code/4-crud/Classes/Goal.h">../code/4-crud/Classes/Goal.h</a></div></p>
</div>
<div class="slide"><h1 class="exercise">3. Change Goal (.m)</h1>
<p class="first">Implement <span class="caps">CRUD</span> methods to delegate to our custom <code>Resource</code> class:</p>
<div class="code-small">
<pre name="code" class="brush: ruby">- (void)createRemote {
NSString *url =
[NSString stringWithFormat:@"%@/goals.json", siteURL];
[Resource post:[self params] to:url];
}
- (void)updateRemote {
NSString *url =
[NSString stringWithFormat:@"%@/goals/%@.json", siteURL, self.goalId];
[Resource put:[self params] to:url];
}
- (void)saveRemote {
if (self.goalId == nil) {
[self createRemote];
} else {
[self updateRemote];
}
}
- (void)destroyRemote {
NSString *url =
[NSString stringWithFormat:@"%@/goals/%@.json", siteURL, self.goalId];
[Resource delete:url];
}
</pre><p></div><div class="codeurl"><a href="txmt://open?url=file:///Users/mike/work/projects/iphone-rails-tutorial/code/4-crud/Classes/Goal.m">../code/4-crud/Classes/Goal.m</a></div></p>
</div>
<div class="slide"><h1 class="exercise">4. Find the TODOs</h1>
<div class="code-small">
<pre name="code" class="brush: ruby; highlight: 7">- (void)tableView:(UITableView *)tableView
commitEditingStyle:(UITableViewCellEditingStyle)editingStyle
forRowAtIndexPath:(NSIndexPath *)indexPath {
[tableView beginUpdates];
if (editingStyle == UITableViewCellEditingStyleDelete) {
Goal *goal = [goals objectAtIndex:indexPath.row];
// TODO: destroy remote goal
[goals removeObjectAtIndex:indexPath.row];
[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath]
withRowAnimation:UITableViewRowAnimationFade];
}
[tableView endUpdates];
}
</pre><p></div><div class="codeurl"><a href="txmt://open?url=file:///Users/mike/work/projects/iphone-rails-tutorial/code/3-scaffold/Classes/GoalsViewController.m">../code/3-scaffold/Classes/GoalsViewController.m</a></div></p>
<div class="code-small">
<pre name="code" class="brush: ruby; highlight: 4">-(IBAction)save {
goal.name = nameField.text;
goal.amount = amountField.text;
// TODO: create or update remote goal
[self.delegate didChangeGoal:goal];
[self.navigationController popViewControllerAnimated:YES];
}
</pre><p></div><div class="codeurl"><a href="txmt://open?url=file:///Users/mike/work/projects/iphone-rails-tutorial/code/3-scaffold/Classes/GoalAddViewController.m">../code/3-scaffold/Classes/GoalAddViewController.m</a></div></p>
</div>
<div class="slide"><h1 class="exercise">5. Fix the TODOs</h1>
<div class="code-small">
<pre name="code" class="brush: ruby; highlight: 7">- (void)tableView:(UITableView *)tableView
commitEditingStyle:(UITableViewCellEditingStyle)editingStyle
forRowAtIndexPath:(NSIndexPath *)indexPath {
[tableView beginUpdates];
if (editingStyle == UITableViewCellEditingStyleDelete) {
Goal *goal = [goals objectAtIndex:indexPath.row];
[goal destroyRemote];
[goals removeObjectAtIndex:indexPath.row];
[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath]
withRowAnimation:UITableViewRowAnimationFade];
}
[tableView endUpdates];
}
</pre><p></div><div class="codeurl"><a href="txmt://open?url=file:///Users/mike/work/projects/iphone-rails-tutorial/code/4-crud/Classes/GoalsViewController.m">../code/4-crud/Classes/GoalsViewController.m</a></div></p>
<div class="code-small">
<pre name="code" class="brush: ruby; highlight: 4">-(IBAction)save {
goal.name = nameField.text;
goal.amount = amountField.text;
[goal saveRemote];
[self.delegate didChangeGoal:goal];
[self.navigationController popViewControllerAnimated:YES];
}
</pre><p></div><div class="codeurl"><a href="txmt://open?url=file:///Users/mike/work/projects/iphone-rails-tutorial/code/4-crud/Classes/GoalAddViewController.m">../code/4-crud/Classes/GoalAddViewController.m</a></div></p>
</div>
<div class="slide"><h1 class="exercise">6. Run It</h1>
<ol>
<li>Open the Xcode console (<code>⇧ ⌘ R</code>)</li>
<li>Create a goal</li>
<li>Edit a goal</li>
<li>Delete a goal</li>
<li>See <span class="caps">GET</span>, <span class="caps">POST</span>, <span class="caps">PUT</span>, and <span class="caps">DELETE</span> requests in the console?</li>
<li>Is everything in sync with the Rails app?</li>
</ol>
<div class="hint">
At this point, we’ve replicated the app in <code>code/4-crud</code>
</div>
</div>
<div class="slide"><h1>Are We Done?!</h1>
<ul>
<li>We have full <span class="caps">REST</span> interaction, but…</li>
<li>No error handling</li>
<li>No authentication support</li>
<li>Every request is synchronous</li>
<li>Answer: No!</li>
</ul>
</div>
<div class="title slide">
<h1>Asynchronous Networking</h1>
</div>
<div class="slide"><h1>Remember the Synchronous Way?</h1>
<p class="first">1. Create a request from a <span class="caps">URL</span>:</p>
<div class="code-small">
<pre name="code" class="brush: objc">NSURL *url = [NSURL URLWithString:@"http://localhost:3000/goals.json"];
NSURLRequest *request = [NSURLRequest requestWithURL:url];</pre></div>
<p>2. Send the request synchronously:</p>
<div class="code-small">
<pre name="code" class="brush: objc">NSURLResponse *response = nil;
NSError *error = nil;
NSData *responseData =
[NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];</pre></div>
<p>3. Handle the returned data:</p>
<div class="code-small">
<pre name="code" class="brush: objc">NSString *responseString =
[[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding]; </pre></div>
</div>
<div class="slide"><h1>Forget the Synchronous Way!</h1>
<ul>
<li>Synchronous requests block the iPhone UI’s main thread</li>
<li><strong>This is very bad!</strong></li>
<li>It may feel like your app has crashed or frozen</li>
<li>Users will curse you</li>
</ul>
</div>
<div class="slide"><h1>Asynchronous Networking</h1>
<p class="first">1. Create a request from a <span class="caps">URL</span>:</p>
<div class="code-medium">
<pre name="code" class="brush: objc">NSURL *url = [NSURL URLWithString:@"http://localhost:3000/goals.json"];
NSURLRequest *request = [NSURLRequest requestWithURL:url];</pre></div>
<p>2. Send the request <em>asynchronously</em>, with a delegate:</p>
<div class="code-medium">
<pre name="code" class="brush: objc">NSURLConnection *connection =
[[NSURLConnection alloc] initWithRequest:request delegate:self];</pre></div>
</div>
<div class="slide"><h1>Asynchronous Networking</h1>
<p class="first">3. Handle the returned data in a delegate method:</p>
<div class="code-medium">
<pre name="code" class="brush: objc">- (void)connection:(NSURLConnection *)connection
didReceiveData:(NSData *)data {
if (receivedData == nil) {
receivedData = [[NSMutableData alloc] init];
}
[receivedData appendData:data];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
// do something with receivedData
}
- (void)connection:(NSURLConnection *)connection
didFailWithError:(NSError *)error {
// handle error
}</pre></div>
</div>
<div class="slide"><h1>Operation Queues</h1>
<ol class="incremental">
<li><code>NSURLConnection</code> can run a network request asynchronously</li>
<li>But what about other work you might want to run in the background?</li>
<li>Concurrent programming is hard</li>
<li>Operation queues make it easy to manage background tasks</li>
</ol>
</div>
<div class="slide"><h1>Using Operation Queues</h1>
<p class="first">1. Write a method you want to run asynchronously:</p>
<div class="code-medium">
<pre name="code" class="brush: objc">- (void)doWork:(NSObject *)anArgument {
// do some work
}</pre></div>
<p>2. Wrap the method in an <code>NSInvocationOperation</code>:</p>
<div class="code-medium">
<pre name="code" class="brush: objc">NSInvocationOperation *operation = [[NSInvocationOperation alloc]
initWithTarget:self selector:@selector(doWork:) object:anArgument];</pre></div>
<p>3. Add it to an <code>NSOperationQueue</code>:</p>
<div class="code-medium">
<pre name="code" class="brush: objc">NSOperationQueue *queue = [[NSOperationQueue alloc] init];
[queue addOperation:operation];
[operation release];</pre></div>
</div>
<div class="slide"><h1>Respect the Main Thread</h1>
<ul>
<li>The main thread encompasses the app’s main run loop</li>
<li>Always update the UI on the main thread</li>
<li>Contrived example of a method running in a separate thread:</li>
</ul>
<div class="code-medium">
<pre name="code" class="brush: objc">- (void)doWork:(NSObject *)anArgument {
[self.tableView performSelectorOnMainThread:@selector(reloadData)
withObject:nil
waitUntilDone:NO];
[self.navigationController
performSelectorOnMainThread:@selector(popViewControllerAnimated:)
withObject:[NSNumber numberWithBool:YES]
waitUntilDone:NO];
[self performSelectorOnMainThread:@selector(deleteRowsAtIndexPaths:)
withObject:[NSArray arrayWithObject:indexPath]
waitUntilDone:NO];
} </pre></div>
</div>
<div class="title slide">
<h1>Off-The-Shelf <span class="caps">REST</span> Library</h1>
</div>
<div class="slide"><h1>Task: <span class="caps">CRUD</span> a Remote Resource</h1>
<p class="first">Same UI, but with</p>
<ul>
<li>Full <span class="caps">REST</span> support</li>
<li>Asynchronous networking</li>
<li>Better error handling</li>
<li>Basic authentication</li>
</ul>
</div>
<div class="slide"><h1>Task: <span class="caps">CRUD</span> a Remote Resource</h1>
<p><img src="../assets/images/table-crud-remote-async.png" alt="" /></p>
</div>
<div class="slide"><h1>HTTPRiot</h1>
<ul>
<li><a href="http://github.com/caged/httpriot">HTTPRiot</a> is a simple <span class="caps">REST</span> library that makes it easy to interact with RESTful resources (inspired by <a href="http://github.com/jnunemaker/httparty">httparty</a>)</li>
<li>Asynchronous networking using operation queues and delegate methods</li>
<li>Responses are automatically converted to NSDictionary or NSArray objects</li>
<li>You decide what to do with the results…</li>
</ul>
</div>
<div class="slide"><h1>HTTPRiot Configuration</h1>
<p class="first">Base <span class="caps">URL</span> where your resources live:</p>
<div class="code-medium">
<pre name="code" class="brush: objc">[HRRestModel setBaseURL:[NSURL URLWithString:@"http://your-server"]];</pre></div>
<p>Delegate object that handles responses:</p>
<div class="code-medium">
<pre name="code" class="brush: objc">[HRRestModel setDelegate:anObject];
</pre></div>
<p>Optional bits:</p>
<div class="code-medium">
<pre name="code" class="brush: objc">[HRRestModel setFormat:HRDataFormatXML]; // JSON by default
[HRRestModel setBasicAuthWithUsername:@"mike" password:@"secret"];</pre></div>
</div>
<div class="slide"><h1>Sending <span class="caps">REST</span> Requests</h1>
<div class="code-medium">
<pre name="code" class="brush: objc">[HRRestModel getPath:@"/goals" withOptions:nil object:nil];
</pre></div>
<div class="code-medium">
<pre name="code" class="brush: objc">NSDictionary *params = [NSDictionary dictionaryWithObject:
[newGoal JSONRepresentation] forKey:@"body"];
[HRRestModel postPath:@"/goals" withOptions:params object:nil];
</pre></div>
<div class="code-medium">
<pre name="code" class="brush: objc">NSDictionary *params = [NSDictionary dictionaryWithObject:
[updatedGoal JSONRepresentation] forKey:@"body"];
[HRRestModel putPath:@"/goals/3" withOptions:params object:nil];
</pre></div>
<div class="code-medium">
<pre name="code" class="brush: objc">[HRRestModel deletePath:@"/goals/3" withOptions:nil object:nil];</pre></div>
</div>
<div class="slide"><h1>Delegate Methods: Success</h1>
<p class="first">Results delivered in a callback method implemented by the delegate:</p>
<div class="code-medium">
<pre name="code" class="brush: objc">- (void)restConnection:(NSURLConnection *)connection
didReturnResource:(id)resource
object:(id)object {
// resource is an array or dictionary
for (id item in resource) {
Goal *goal = [[Goal alloc] initWithDictionary:item];
}
}
- (void)restConnection:(NSURLConnection *)connection
didReceiveResponse:(NSHTTPURLResponse *)response
object:(id)object {
// If you're interested in handling response codes
}</pre></div>
<div class="hint">
You should read the source. It’s good, and at this point you’ll understand how it works.
</div>
</div>
<div class="slide"><h1>Delegate Methods: Failure</h1>
<p class="first">Delegate object should implement these methods, too:</p>
<div class="code-medium">
<pre name="code" class="brush: objc">- (void)restConnection:(NSURLConnection *)connection
didFailWithError:(NSError *)error
object:(id)object {
// Handle connection errors: failure to connect to server, etc.
}
- (void)restConnection:(NSURLConnection *)connection
didReceiveError:(NSError *)error
response:(NSHTTPURLResponse *)response
object:(id)object {
// Handle invalid responses: 404, 500, etc.
}
- (void)restConnection:(NSURLConnection *)connection
didReceiveParseError:(NSError *)error
responseBody:(NSString *)string {
// Request was successful, but couldn't parse the
// data returned by the server
}
</pre></div>
</div>
<div class="slide"><h1 class="exercise">1. Level Up!</h1>
<ol>
<li>Switch to the iPhone app in the <code>code/5-httpriot</code> directory</li>
<li>Create, edit, and delete a goal</li>
<li>Search for <code>HRRestModel</code> to see how it works</li>
<li>Better yet, let’s do some spelunking with the debugger…</li>
</ol>
</div>
<div class="slide"><h1 class="exercise">2. Fetch Goals Asynchronously</h1>
<p class="first">Set a breakpoint in the <code>refresh</code> action of <code>GoalsViewController.m</code>:</p>
<div class="code-medium">
<pre name="code" class="brush: ruby; highlight: 4">- (IBAction)refresh {
[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
[HRRestModel setDelegate:self];
[HRRestModel getPath:@"/goals" withOptions:nil object:nil];
}
</pre><p></div><div class="codeurl"><a href="txmt://open?url=file:///Users/mike/work/projects/iphone-rails-tutorial/code/5-httpriot/Classes/GoalsViewController.m">../code/5-httpriot/Classes/GoalsViewController.m</a></div></p>