RubyMotion by Clay Allsopp

By Clay Allsopp

Builders drawn to local iOS app improvement were limited to the bounds of Objective-C and Xcode - until eventually RubyMotion got here alongside. RubyMotion permits you do complete iOS improvement utilizing Ruby. you have got entry to universal instruments akin to Rake and RubyGems and will assemble Ruby code into local functions. RubyMotion even comes with a Ruby console important for reside coding and interactive debugging. and because RubyMotion is equipped on most sensible of the Objective-C runtime, you should use all of Apple's libraries and so much third-party code along Ruby periods.

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The ChangeColorController modal view also needs a UITextField and UIButton, both of which we covered in Chapter 2, Filling the Screen with Views, on page 11. When the button is tapped, we’ll take whatever is in the text field and use that to create a UIColor that ColorDetailController can use. Just like the other controllers, this logic belongs in viewDidLoad(). addTarget(self, action:"change_color", forControlEvents:UIControlEventTouchUpInside) end It’s lengthy, but most of the code just lays out our views.

App. rb. addSubview(@table) end end Looks like a typical controller so far, doesn’t it? We store our table view in the @table instance variable and add it like a normal subview, sized to fit the controller. The one new thing here is autoresizingMask(), which is a bitmask of UIViewAutoResizing constants. These are used to define how a view changes when its parent view is being resized; in this case, we allow the height of the table to be flexible. Next, we need to set up a window and add the AlphabetController as its root controller.

In some cases, notably viewDidAppear, Apple explicitly says you need to call the superclass method in any UIViewController subclass. Refer to Apple’s documentationa for more details. a. 2 Using Multiple Controllers with UINavigationController Although some iOS apps are famous for their unique visuals, most apps share a common set of interface elements and interactions included with the SDK. Typical apps will have a persistent top bar (usually blue) with a title and some buttons; these apps use an instance of UINavigationController, one of the standard container controllers in iOS.

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