RubyMotion

RubyMotioniOS Development with Ruby @markbates

I HATE iOSDEVELOPMENT!

Why I Hate iOS Development

Why I Hate iOS Development✦ XCode

Why I Hate iOS Development✦ XCode✦ Objective-C

Why I Hate iOS Development✦ XCode✦ Objective-C✦ Cocoa/iOS APIs

Objective-C

# Create a new array (mutable):myArray = %w{hello world etc}myArray << "new value"# Create a new hash (mutable):myHash = {"key-a" => "value-a", "key-b" => "value-b"}myHash["key-c"] = "value-c"

// Create a new array:NSArray *myArray = [NSArray arrayWithObjects:@"hello",@"world",@"etc",nil];// Create a mutable array:NSMutableArray *myArray = [[NSMutableArray alloc] init];[myArray addObject:@"hello world"];// Create a dictionary (hash):NSDictionary *myDictionary = [NSDictionary dictionaryWithObjectsAndKeys:@"value-a", @"key-a", @"value-b", @"key-b", nil];// Create a mutable dictionary:NSMutableDictionary *myDictionary = [NSMutableDictionary dictionary];[myDictionary setObject: @"value-c" forKey: @"key-c"];

now = -> { puts "The date and time is: #{Time.now}"}now.call

void (^now)(void) = ^ { NSDate *date = [NSDate date]; NSLog(@"The date and time is %@", date);};now();

Cocoa/iOS APIs

require net/httprequire jsonurl = "http://www.example.com/api.json"response = Net::HTTP.get_response(URI.parse(url))if response.code.to_i == 200 json = JSON.parse(response.body) puts json.inspectelse puts "An Error Occurred (#{response.code}): #{response.body}"end

- (void)viewDidLoad { [super viewDidLoad]; responseData = [[NSMutableData data] retain]; NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.example.com/api.json"]]; [[NSURLConnection alloc] initWithRequest:request delegate:self];}- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response { [responseData setLength:0];}- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { [responseData appendData:data];}- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error { label.text = [NSString stringWithFormat:@"Connection failed: %@", [error description]];}- (void)connectionDidFinishLoading:(NSURLConnection *)connection { [connection release]; NSString *responseString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding]; [responseData release]; NSError *error; SBJSON *json = [[SBJSON new] autorelease]; NSArray *myArray = [json objectWithString:responseString error:&error]; [responseString release]; if (myArray == nil) label.text = [NSString stringWithFormat:@"JSON parsing failed: %@", [error localizedDescription]]; else { NSMutableString *text = [NSMutableString stringWithString:@"Array Data:n"]; for (int i = 0; i < [myArray count]; i++) [text appendFormat:@"%@n", [myArray objectAtIndex:i]]; label.text = text; }}

Laurent Sansonetti✦ Worked for Apple for 7 years on iLife and OS X✦ Developed MacRuby✦ Developed RubyCocoa✦ Belgian

So What Does it Do?

So What Does it Do?✦ Ruby!!! (NO OBJECTIVE-C!)

So What Does it Do?✦ Ruby!!! (NO OBJECTIVE-C!)✦ Keep Your Editor (NO XCODE!)

So What Does it Do?✦ Ruby!!! (NO OBJECTIVE-C!)✦ Keep Your Editor (NO XCODE!)✦ IRB

So What Does it Do?✦ Ruby!!! (NO OBJECTIVE-C!)✦ Keep Your Editor (NO XCODE!)✦ IRB✦ Terminal Based Workﬂow (Rake)

So What Does it Do?✦ Ruby!!! (NO OBJECTIVE-C!)✦ Keep Your Editor (NO XCODE!)✦ IRB✦ Terminal Based Workﬂow (Rake)✦ Testing Framework (MacBacon)

So What Does it Do?✦ Ruby!!! (NO OBJECTIVE-C!) ✦ Native Applications✦ Keep Your Editor (NO XCODE!)✦ IRB✦ Terminal Based Workﬂow (Rake)✦ Testing Framework (MacBacon)

So What Does it Do?✦ Ruby!!! (NO OBJECTIVE-C!) ✦ Native Applications✦ Keep Your Editor (NO XCODE!) ✦ App Store Approved✦ IRB✦ Terminal Based Workﬂow (Rake)✦ Testing Framework (MacBacon)

Suck it Objective-C!

NSString *urlAsString = @"http://www.apple.com";NSURL *url = [NSURL URLWithString:urlAsString];NSURLRequest *urlRequest = [NSURLRequest requestWithURL:url];NSOperationQueue *queue = [[NSOperationQueue alloc] init];[NSURLConnection sendAsynchronousRequest:urlRequest queue:queue completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) { if ([data length] >0 && error == nil){ /* Get the documents directory */ NSString *documentsDir = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0]; /* Append the file name to the documents directory */ NSString *filePath = [documentsDir stringByAppendingPathComponent:@"apple.html"]; /* Write the data to the file */ [data writeToFile:filePath atomically:YES]; NSLog(@"Successfully saved the file to %@", filePath); } else if ([data length] == 0 && error == nil){ NSLog(@"Nothing was downloaded."); } else if (error != nil){ NSLog(@"Error happened = %@", error); } }];

url = NSURL.URLWithString("http://www.apple.com")request = NSURLRequest.requestWithURL(url)queue = NSOperationQueue.alloc.initNSURLConnection.sendAsynchronousRequest(request, queue: queue, completionHandler: lambda do |response, data, error| if(data.length > 0 && error.nil?) doc_dir = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, true).first #p doc_dir file_path = doc_dir.stringByAppendingPathComponent("apple.html") data.writeToFile(file_path, atomically: true) p "Saved file to #{file_path}" elsif( data.length == 0 && error.nil? ) p "Nothing was downloaded" elsif(!error.nil?) p "Error: #{error}" end end)

But What About Those WeirdNamed Argument Methods?

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { // do something}- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { // do something}- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { // do something}

def tableView(tableView, didSelectRowAtIndexPath: indexPath) # do somethingenddef tableView(tableView, numberOfRowsInSection: section) # do somethingenddef tableView(tableView, cellForRowAtIndexPath: indexPath) # do somethingend

Demo Time

Bubble Wraphttps://github.com/rubymotion/BubbleWrap

HTTPdata = {ﬁrst_name: Matt, last_name: Aimonetti}BubbleWrap::HTTP.post("http://foo.bar.com/", {payload: data}) do |response| if response.ok? json = BubbleWrap::JSON.parse(response.body.to_str) p json[id] elsif response.status_code.to_s =~ /40d/ App.alert("Login failed") else App.alert(response.error_message) endend

App> App.documents_path# "~/iPhone Simulator/5.0/Applications/EEC6454E-1816-451E-BB9A-EE18222E1A8F/Documents"> App.resources_path# "~/iPhone Simulator/5.0/Applications/EEC64-1816-451E-BB9A-EE18221A8F/testSuite_spec.app"> App.name# "testSuite"> App.identiﬁer# "io.bubblewrap.testSuite"> App.alert("BubbleWrap is awesome!")# creates and shows an alert message.> App.run_after(0.5) { p "Its #{Time.now}" }# Runs the block after 0.5 seconds.> App.open_url("http://matt.aimonetti.net")# Opens the url using the devices browser. (accepts a string url or an instance of NSURL.> App::Persistence[channels] # application speciﬁc persistence storage# [NBC, ABC, Fox, CBS, PBS]> App::Persistence[channels] = [TF1, France 2, France 3]# [TF1, France 2, France 3]

Device> Device.iphone?# true> Device.ipad?# false> Device.front_camera?# true> Device.rear_camera?# true> Device.orientation# :portrait> Device.simulator?# true> Device.retina?# false> Device.screen.width# 320> Device.screen.height# 480> Device.screen.width_for_orientation(:landscape_left)# 480> Device.screen.height_for_orientation(:landscape_left)# 320

Camera# Uses the front cameraBW::Device.camera.front.picture(media_types: [:movie, :image]) do |result| image_view = UIImageView.alloc.initWithImage(result[:original_image])end# Uses the rear cameraBW::Device.camera.rear.picture(media_types: [:movie, :image]) do |result| image_view = UIImageView.alloc.initWithImage(result[:original_image])end# Uses the photo libraryBW::Device.camera.any.picture(media_types: [:movie, :image]) do |result| image_view = UIImageView.alloc.initWithImage(result[:original_image])end

JSONBW::JSON.generate({foo => 1, bar => [1,2,3], baz => awesome})=> "{"foo":1,"bar":[1,2,3],"baz":"awesome"}"BW::JSON.parse "{"foo":1,"bar":[1,2,3],"baz":"awesome"}"=> {"foo"=>1, "bar"=>[1, 2, 3], "baz"=>"awesome"}

Media# Plays in your custom framelocal_file = NSURL.fileURLWithPath(File.join(NSBundle.mainBundle.resourcePath, test.mp3))BW::Media.play(local_file) do |media_player| media_player.view.frame = [[10, 100], [100, 100]] self.view.addSubview media_player.viewend# Plays in an independent modal controllerBW::Media.play_modal("http://www.hrupin.com/wp-content/uploads/mp3/testsong_20_sec.mp3")

Deferrables> d = EM::DefaultDeferrable.new=> #<BubbleWrap::Reactor::DefaultDeferrable:0x6d859a0>> d.callback { |what| puts "Great #{what}!" }=> [#<Proc:0x6d8a1e0>]> d.succeed "justice"Great justice!=> nil

Events> o = Class.new { include EM::Eventable }.new=> #<#<Class:0x6dc1310>:0x6dc2ec0>> o.on(:november_5_1955) { puts "Ow!" }=> [#<Proc:0x6dc6300>]> o.on(:november_5_1955) { puts "Flux capacitor!" }=> [#<Proc:0x6dc6300>, #<Proc:0x6dc1ba0>]> o.trigger(:november_5_1955)Ow!Flux capacitor!=> [nil, nil]

More...✦ Localization ✦ Location✦ Color ✦ Gestures✦ UUID Generator ✦ RSS Parser✦ NSNotiﬁcationCenter ✦ Reactor✦ Persistence ✦ Timers✦ Observers✦ String (underscore, camelize, etc...)

Pros & Cons

The Pros

The Pros✦ Ruby!!

The Pros✦ Ruby!!✦ IDE Agnostic

The Pros✦ Ruby!!✦ IDE Agnostic✦ “Wrapper” Gems

The Pros✦ Ruby!!✦ IDE Agnostic✦ “Wrapper” Gems✦ Fast

The Pros✦ Ruby!!✦ IDE Agnostic✦ “Wrapper” Gems✦ Fast✦ IRB

The Pros✦ Ruby!! ✦ Easy to test✦ IDE Agnostic✦ “Wrapper” Gems✦ Fast✦ IRB

The Pros✦ Ruby!! ✦ Easy to test✦ IDE Agnostic ✦ Growing community✦ “Wrapper” Gems✦ Fast✦ IRB

The Pros✦ Ruby!! ✦ Easy to test✦ IDE Agnostic ✦ Growing community✦ “Wrapper” Gems ✦ Frequent updates✦ Fast✦ IRB

The Cons

The Cons✦ Cost - $199

The Cons✦ Cost - $199✦ Existing tutorials in Objective-C

The Cons✦ Cost - $199✦ Existing tutorials in Objective-C✦ Maintainability?

The Cons✦ Cost - $199✦ Existing tutorials in Objective-C✦ Maintainability?✦ No Debugger (Yet)

The Cons✦ Cost - $199✦ Existing tutorials in Objective-C✦ Maintainability?✦ No Debugger (Yet)✦ Difﬁcult to work with Interface Builder

The Verdict

Resources✦ http://www.rubymotion.com ✦ http://rubymotionapps.com/projects✦ http://rubymotion-tutorial.com ✦ http://pragmaticstudio.com/screencasts/ rubymotion✦ https://github.com/IconoclastLabs/ rubymotion_cookbook✦ https://github.com/railsfactory/ rubymotion-cookbook✦ https://twitter.com/RubyMotion✦ http://rubymotionweekly.com

RubyMotion

by Mark on Aug 15, 2012

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