Andrew Nesbitt github.com/andrew @teabass 

forwardtechnology.co.uk 

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410m iOS devices As of June 2012 http://en.wikipedia.org/wiki/IOS That is a market that is hard to ignore 

http://www.textfromxcode.com That is a market that is hard to ignore 

http://macruby.org Macruby Rubymotion is based on Macruby, which implements ruby natively in the objective c runtime Rubymotion has a number of internal differences which allow it to run within the sandboxed iOS Including memory management code as iOS lacks proper garbage collection 

twitter.com/lrz Laurent Sansonetti Build by Laurent Sansonetti, formerly of the iOS team Apple Core contributor to Macruby Left Apple to be able to release Rubymotion from his new company, Hipbyte 

£129 ($199) Proprietary software is pretty unusual in the ruby community. Concerns about what long term support So far so good, lots of regular updates and good customer support About the same cost as the iOS Developer Program 

// Objective C - (NSInteger)pickerView:(UIPickerView *)pickerView forComponent:(NSInteger)component { ... } # RubyMotion def pickerView(pickerView, titleForRow:row, forComponent:component) ... end Code The are quite similar, syntactic sugar aside, except for the static typing The main difference between Rubymotion and normal ruby motions are the keyword arguments 

String => NSMutableString => NSString => NSObject Integer => Numeric => NSNumber => NSValue => NSObject Hash => NSMutableDictionary => NSDictionary => NSObject Array => NSMutableArray => NSArray => NSObject Symbol => NSString => NSObject Time => NSDate => NSObject Inheritance Ruby classes are implemented on top of their Cocoa equivalents 

[:!, :!=, :!~, :%, :*, :+, :<, :<<, :<=, :<=>, :==, :===, :=~, :>, :>=, :[], : []=, :__id__, :__send__, :ascii_only?, :between?, :bytes, :bytesize, :byteslice, :capitalize, :capitalize!, :casecmp, :center, :chars, :chomp, :chomp!, :chop, :chop!, :chr, :class, :clear, :clone, :codepoints, :concat, :count, :crypt, :define_singleton_method, :delete, :delete!, :display, :downcase, :downcase!, :dump, :dup, :each_byte, :each_char, :each_codepoint, :each_line, :empty?, :encode, :encode!, :encoding, :end_with?, :enum_for, :eql?, :equal?, :extend, :force_encoding, :freeze, :frozen?, :getbyte, :gsub, :gsub!, :hash, :hex, :include?, :index, :initialize_clone, :initialize_dup, :insert, :inspect, :instance_eval, :instance_exec, :instance_of?, :instance_variable_defined?, :instance_variable_get, :instance_variable_set, :instance_variables, :intern, :is_a?, :kind_of?, :length, :lines, :ljust, :local_methods, :lstrip, :lstrip!, :match, :method, :methods, :next, :next!, :nil?, :object_id, :oct, :ord, :partition, :prepend, :pretty_inspect, :pretty_print, :pretty_print_cycle, :pretty_print_inspect, :pretty_print_instance_variables, :private_methods, :protected_methods, :public_method, :public_methods, :public_send, :replace, :respond_to?, :respond_to_missing?, :reverse, :reverse!, :rindex, :rjust, :rpartition, :rstrip, :rstrip!, :scan, :send, :setbyte, :singleton_class, :singleton_methods, :size, :slice, :slice!, :split, :squeeze, :squeeze!, :start_with?, :strip, :strip!, :sub, :sub!, :succ, :succ!, :sum, :swapcase, :swapcase!, :taint, :tainted?, :tap, :to_c, :to_enum, :to_f, :to_i, :to_r, :to_s, :to_str, :to_sym, :tr, :tr!, :tr_s, :tr_s!, :trust, :unpack, :untaint, :untrust, :untrusted?, :upcase, :upcase!, :upto, :valid_encoding?] "ruby".methods.sort Here we can see the methods available on a string in ruby including methods for Object, which string inherits from 

[:!, :"!=:", :"! ~:", :"%:", :"*:", :"+:", :"<:", :"<<:", :"<=:", :"<=>:", :"==:", :"===:", :"=~:", :">:", :">=:", :"CA_addValue:multipliedBy:", :CA_copyRenderValue, :"CA_distanceToValue:", :"CA_interpolateValue:byFraction:", :"CA_interpolateValues:::interpolator:", :CA_prepareRenderValue, :Complex, :"Complex:", :"LS_hasCaseInsensitivePrefix:", :LS_unescapedQueryValue, :MCAppendDeviceName, :MCAppendGreenteaSuffix, :MCSHA256DigestWithSalt, :MCSafeFilenameHash, :"MCSafeFilenameHashWithExtension:", :"MLBindToSQLiteStatement:atPosition:", :MLSortString, :MPMediaLibraryDataProviderSystemML3CoercedString, :Rational, :"Rational:", :UTF8String, :[], :"[]:", : []=, :"[]=:", :__callee__, :__id__, :__method__, :__send__, :"__send__:", :__type__, :accessibilityActivate, :accessibilityActivationPoint, :"accessibilityArrayOfTextForTextMarkers:", :"accessibilityAttributeValue:", :"accessibilityAttributeValue:forParameter:", :"accessibilityBoundsForTextMarkers:", :"accessibilityCandidateWordDescription:", :accessibilityColumnRange, :"accessibilityCompareGeometry:", :accessibilityContainer, :accessibilityContainerElements, :"accessibilityContentForLineNumber:", :accessibilityCustomActions, :"accessibilityCustomRotorItemsAtIndex:", :accessibilityCustomRotorTitles, :accessibilityDecrement, :"accessibilityEditOperationAction:", :"accessibilityElementAtIndex:", :accessibilityElementCount, :accessibilityElementDidBecomeFocused, :accessibilityElementDidLoseFocus, :"accessibilityElementForRow:andColumn:", :accessibilityElementIsFocused, :accessibilityElementsHidden, :"accessibilityEnumerateContainerElementsUsingBlock:", :"accessibilityEnumerateContainerElementsWithOptions:usingBlock:", :accessibilityFlowToElements, :accessibilityFrame, :"accessibilityFrameForLineNumber:", :accessibilityHeaderElements, :accessibilityHint, :"accessibilityHitTest:", :accessibilityIdentification, :accessibilityIdentifier, :accessibilityIncrement, :accessibilityInvalidStatus, :accessibilityIsComboBox, :accessibilityLabel, :"accessibilityLabelForRange:", :accessibilityLanguage, :"accessibilityLineNumberForPoint:", :accessibilityLinkedElement, :accessibilityMathEquation, :accessibilityMathMLSource, :accessibilityMenuActions, :accessibilityPageContent, :accessibilityPaths, :"accessibilityPerformAction:withValue:", :"accessibilityPerformCustomAction:", :accessibilityPerformEscape, :accessibilityPerformMagicTap, :accessibilityPlaceholderValue, :"accessibilityPostNotification:withObject:afterDelay:", :accessibilityRequired, :accessibilityRootElement, :accessibilityRowRange, :"accessibilityScroll:", :accessibilityScrollDownPageSupported, :accessibilityScrollLeftPageSupported, :accessibilityScrollRightPageSupported, :accessibilityScrollUpPageSupported, :accessibilitySecondaryLabel, :"accessibilitySetIdentification:", :accessibilityShouldEnumerateContainerElementsArrayDirectly, :accessibilitySpeechHint, :accessibilityStartStopToggle, :"accessibilityStringForTextMarkers:", :accessibilityTitleElement, :accessibilityTraits, :accessibilityURL, :accessibilityUserDefinedActivationPoint, :accessibilityUserDefinedFrame, :accessibilityUserDefinedHint, :accessibilityUserDefinedIdentifier, :accessibilityUserDefinedIsMainWindow, :accessibilityUserDefinedLabel, :accessibilityUserDefinedLanguage, :accessibilityUserDefinedNotFirstElement, :accessibilityUserDefinedServesAsFirstElement, :accessibilityUserDefinedSize, :accessibilityUserDefinedTraits, :accessibilityUserDefinedValue, :accessibilityUserDefinedWindowVisible, :accessibilityValue, :accessibilityViewIsModal, :"accessibilityViewWithIdentifier:", :"accessibilityZoomInAtPoint:", :"accessibilityZoomOutAtPoint:", :"addObserver:forKeyPath:options:context:", :allowSafePerformSelector, :allowsWeakReference, :"appendCharacters:length:", :"appendFormat:", :"appendString:", :ascii_only?, :autoContentAccessingProxy, :autorelease, :"awakeAfterUsingCoder:", :awakeFromNib, :becomeActive, :becomeInactive, :"between?:", :blockingMainThreadProxy, :boolValue, :bytes, :bytesize, :cString, :cStringLength, :"cStringUsingEncoding:", :camelize, :"camelize:", :"canBeConvertedToEncoding:", :capitalize, :capitalize!, :capitalizedString, :"capitalizedStringWithLocale:", :"caseInsensitiveCompare:", :"casecmp:", :center, :"center:", :"characterAtIndex:", :chars, :chomp, :chomp!, :"chomp!:", :"chomp:", :chop, :chop!, :"chop!:", :"chop:", :chr, :class, :classForArchiver, :classForCoder, :classForKeyedArchiver, :classForPortCoder, :className, :clear, :clone, :codepoints, :"commonNonWordBreakingPrefixWithString:options:", :"commonPrefixWithString:options:", :"compare:", :"compare:options:", :"compare:options:range:", :"compare:options:range:locale:", :"completePathIntoString:caseSensitive:matchesIntoArray:filterTypes:", :"componentsSeparatedByCharactersInSet:", :"componentsSeparatedByString:", :"concat:", :"conformsToProtocol:", :"containsSubstring:", :copy, :"copyUTF8StringOfLength:", :"copyWithZone:", :copyWithoutInsignificantCharacters, :copyWithoutInsignificantPrefixAndCharacters, :count, :"count:", :countOfComposedCharacterSequences, :"crypt:", :"cts_boundingRectWithSize:options:attributes:", :"cts_doBoundingRectWithSize:options:attributes:", :"cts_drawAtPoint:withAttributes:", :"cts_drawInRect:withAttributes:", :"cts_drawWithRect:options:attributes:", :"cts_sizeWithAttributes:", :cutStringByResolvingAndStandardizingPath, :"dataUsingEncoding:", :"dataUsingEncoding:allowLossyConversion:", :"dd_appendSpaces:", :dealloc, :debugDescription, :decimalValue, :decomposedStringWithCanonicalMapping, :decomposedStringWithCompatibilityMapping, :defaultAccessibilityTraits, :define_singleton_method, :"define_singleton_method:", :"delayedProxy:", :delete, :delete!, :"delete!:", :"delete:", :"deleteCharactersInRange:", :description, :destinationIdIsEmailAddress, :destinationIdIsPhoneNumber, :"dictionaryWithValuesForKeys:", :"didChange:valuesAtIndexes:forKey:", :"didChangeValueForKey:", :"didChangeValueForKey:withSetMutation:usingObjects:", :disallowSafePerformSelector, :displayableString, :"displayableStringByStrippingOffCommonPrefixWithString:", :"displayableStringByTrimmingPrefixString:", :"doesNotRecognizeSelector:", :doubleValue, :downcase, :downcase!, :"drawAtPoint:forWidth:withAttributes:", :"drawAtPoint:forWidth:withFont:fontSize:lineBreakMode:baselineAdjustment:", :"drawAtPoint:forWidth:withFont:fontSize:lineBreakMode:baselineAdjustment:includeEmoji:", :"drawAtPoint:forWidth:withFont:lineBreakMode:", :"drawAtPoint:forWidth:withFont:lineBreakMode:letterSpacing:", :"drawAtPoint:forWidth:withFont:lineBreakMode:letterSpacing:includeEmoji:", :"drawAtPoint:forWidth:withFont:minFontSize:actualFontSize:lineBreakMode:baselineAdjustment:", :"drawAtPoint:forWidth:withFont:minFontSize:actualFontSize:lineBreakMode:baselineAdjustment:includeEmoji:", :"drawAtPoint:withFont:", :"drawInRect:withAttributes:", :"drawInRect:withFont:", :"drawInRect:withFont:lineBreakMode:", :"drawInRect:withFont:lineBreakMode:alignment:", :"drawInRect:withFont:lineBreakMode:alignment:lineSpacing:", :"drawInRect:withFont:lineBreakMode:alignment:lineSpacing:includeEmoji:", :dump, :dup, :each_byte, :each_char, :each_codepoint, :each_line, :"each_line:", :"editDistanceFrom:", :empty?, :encode, :encode!, :"encode!:", :"encode:", :"encodeWithCoder:", :encoding, :end_with?, :"end_with?:", :endsSentence, :endsWord, :enum_for, :"enum_for:", :"enumerateLinesUsingBlock:", :"enumerateLinguisticTagsInRange:scheme:options:orthography:usingBlock:", :"enumerateSubstringsInRange:options:usingBlock:", :"eql?:", :"equal?:", :extend, :"extend:", :fastestEncoding, :fileSystemRepresentation, :finalize, :floatValue, :"force_encoding:", :formatConfiguration, :"forwardInvocation:", :"forwardingTargetForSelector:", :freeze, :"fromMainThreadPostNotificationName:object:userInfo:", :"fromNotifySafeThreadPerformSelector:withObject:", :"fromNotifySafeThreadPostNotificationName:object:userInfo:", :frozen?, :"getBytes:maxLength:filledLength:encoding:allowLossyConversion:range:remainingRange:", :"getBytes:maxLength:usedLength:encoding:options:range:remainingRange:", :"getCString:", :"getCString:maxLength:", :"getCString:maxLength:encoding:", :"getCString:m "iOS".methods.sort And here is the methods available on a string in Rubymotion These include all Cocoa and Obecjtive C methods inherited from NSString and NSObjectas well as ruby’s string methods 

Things you can’t do Kernal.anything require ‘foo’ eval ‘foo’ Remember it’s not “real” ruby 

Building and Debugging Building and running apps is all done on the command line using rake Debugging is done with the rubymotion repl, which integrates with the iOS simulator A debugger was released a few weeks ago 

Demo http://github.com/andrew/lightning 

Testing http://www.rubymotion.com/developer-center/articles/testing/ testing using bacon, an rspec clone test ran with `rake test` 

Ship it! rake archive generates an .ipa file which can be uploaded to the app store, used for adhoc distribution or sent out to testers via testflight 

Interface Builder Can be hooked up to IB nib files and also supports storyboarding for iOS 5 onwards 

3rd Party Libraries http://rubymotion-wrappers.com Rubygems CocoaPods http://rubymotion-wrappers.com 

BubbleWrap http://bubblewrap.io 

Notification Center Color conversion Gestures Camera Timers Audio HTTP JSON 

# colour '#FF8A19'.to_color # => # # Notification Center @reload_observer = App.notification_center.observe ReloadNotification do | notification| loadAndRefresh end # Gestures view.whenTapped do UIView.animateWithDuration(1, animations:lambda { # animate # @view.transform = ... }) end # Camera BW::Device.camera.front.picture(media_types: [:movie, :image]) do |result| image_view = UIImageView.alloc.initWithImage(result[:original_image]) end # JSON BW::JSON.parse "{\"foo\":1,\"bar\":[1,2,3],\"baz\":\"awesome\"}" # => {"foo"=>1, "bar"=>[1, 2, 3], "baz"=>"awesome"} 

In The App Store There have been quite a few Rubymotion apps approved on the App store, let’s check out a few 

Cabify http://blog.rubymotion.com/post/30514580062/rubymotion-success-story-cabify 

Ultra Reaction http://ultrareaction.sausyn.com 

Everclip http://blog.rubymotion.com/post/27906866028/rubymotion-success-story-everclip 

Open source example apps http://github.com/hipByte/RubyMotionSamples 

Summary 

Command line driven (no xcode) Bring your own editor Memory Management Interactive Console Fast, native apps It’s Ruby! Pros 

Not an offical Apple project Lacking in documentation Still have to learn Cocoa Provisioning still a pain Proprietary software camelCaseMethods Cons 

Playing Hacking Internal Tools Small apps on the store Use cases Right now it feels risky to invest a lot of time and money into building a large, complex rubymotion app That being said, we have started building a number of medium size apps within Forward that we plan on putting in the App Store 

MobiRuby http://mobiruby.org There may soon be an open source alternative 

Questions?