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POMacRuby: communicating with Objective C from JavaScript
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2011-12-19T21:48:55.923
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<p>I am creating a simple "hello world" application to try to understand how to call Objective-C from JavaScript. My <code>sayHello()</code> and <code>sayGoodBye()</code> methods work, but my <code>speak(text)</code> method does not work. What am I doing wrong? And why do I need to specify <code>@com.respondsToSelector</code> even though I specified <code>self.isSelectorExcludedFromWebScript</code>?</p> <p>page.html</p> <pre><code><!DOCTYPE html> <html> <body> <h3>Example of calling MacRuby/Objective-C from a web page</h3> <button onclick="Communicator.sayHello()">Hello</button> <button onclick="Communicator.sayGoodBye()">Good Bye</button> <button onclick="Communicator.speak('passing an argument')">Pass an argument</button> </body> </html> </code></pre> <p>app.rb</p> <pre><code>framework 'Cocoa' framework 'WebKit' application = NSApplication.sharedApplication class Communicator def sayHello speak('Hello!') end def sayGoodBye speak('Good Bye!') end def speak(text) puts "Speaking: #{text}" speaker = NSSpeechSynthesizer.alloc.initWithVoice('com.apple.speech.synthesis.voice.Agnes') speaker.startSpeakingString(text) end # Make all the Communicator's methods available from JS def self.isSelectorExcludedFromWebScript(sel); false end end class Browser attr_accessor :view, :windowScriptObject def initialize(window) @view = WebView.new window.contentView = @view @view.frameLoadDelegate = self end def load file_url = NSURL.fileURLWithPath('page.html') html = NSString.stringWithContentsOfURL(file_url) @view.mainFrame.loadHTMLString(html, baseURL:file_url) end def webView(view, didFinishLoadForFrame:frame) @com = Communicator.new #shouldnt need any of these @com.respondsToSelector("sayHello") @com.respondsToSelector("sayGoodBye") @com.respondsToSelector("speak:") # colon at the end of method name because it accepts arguments @windowScriptObject = view.windowScriptObject @windowScriptObject.setValue(@com, forKey: "Communicator") end end window = NSWindow.alloc.initWithContentRect([0.0, 0.0, 700.0, 300.0], # x, y, width, height styleMask: NSTitledWindowMask | NSClosableWindowMask | NSMiniaturizableWindowMask | NSResizableWindowMask, backing:NSBackingStoreBuffered, defer:false) browser = Browser.new(window).load window.center window.display window.makeKeyAndOrderFront(nil) window.orderFrontRegardless application.run </code></pre>
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MacRuby: communicating with Objective C from JavaScript
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