RubyMotion by Clay Allsopp

By Clay Allsopp

Builders attracted to local iOS app improvement were limited to the boundaries of Objective-C and Xcode - until eventually RubyMotion got here alongside. RubyMotion allows you do complete iOS improvement utilizing Ruby. you've gotten entry to frequent instruments comparable to Rake and RubyGems and will bring together Ruby code into local purposes. RubyMotion even comes with a Ruby console invaluable for dwell coding and interactive debugging. and because RubyMotion is outfitted on most sensible of the Objective-C runtime, you should use all of Apple's libraries and such a lot third-party code along Ruby sessions.

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It won’t be a super-complicated class: we’ll add a text field for the user to enter the color, as well as a button to enact that change. But before all that, we need to set up the plumbing. rb class ChangeColorController < UIViewController attr_accessor :color_detail_controller We start with Ruby’s nifty attr_accessor() to create the methods color_detail_controller() and color_detail_controller=(). We need these so we can easily store a reference to the ColorDetailController whose color we’re changing.

The table view will then call those methods to get the information it needs to form the rows it needs. Doesn’t sound bad, right? Let’s get to the code. 1 Starting with Simple Rows For now, our task is simple: display a table with all the letters of the alphabet: Last I checked there are twenty-six of them, so that’s enough to show off the fancy row reuse that happens with table views. The table is going to be part of our app’s lone controller, so there isn’t a lot of setup to worry about this time.

Html. info report erratum • discuss Chapter 2. Filling the Screen with Views • 22 Like every other view in the window, we spend some time setting up the frame and positioning it exactly where we want it. returnKeyType() and similar properties control exactly what they say; the only cryptic property we use is UITextBorderStyleRoundedRect, which adds a nice border and inner shadow to our field. By default, UITextFields have empty backgrounds and no default styling. The most important part of our addition is setting @color_field’s delegate.

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