RubyMotion and UIPickerView - rubymotion

Question

I want to use UIPickerView to select a number and assign the selected number to a label. I worked out how to do it using the ib gem and using interface builder to create the initial interface and it works fine. However, I would like to do it purely using RubyMotion code and I can't for the life of me get it to work. The best I have managed is for the label to return True and not a number.
I'm using the following standard code for the picker view delegate methods:
def pickerView(pickerView, numberOfRowsInComponent:component)
101
end
def pickerView(pickerView, titleForRow:row, forComponent:component)
row.to_s
end
def numberOfComponentsInPickerView (pickerView)
1
end
def pickerView(pickerView, didSelectRow:row, inComponent:component)
end
def pickerView(pickerView, titleForRow:row, forComponent:component)
" #{row+1}"
end
def submit
totals.addTotals(myPicker.selectedRowInComponent(0))
end
and then the label text is populated like this:
numLabel = UILabel.new
numLabel.text = "Number Selected: #{submit}"
numLabel.font = UIFont.boldSystemFontOfSize(18)
numLabel.frame = [[20,320],[260,340]]
numLabel.numberOfLines = 2
numLabel.adjustsFontSizeToFitWidth = 'YES'
self.view.addSubview numLabel
The totals is a shared client.

Answer 1

Here is how to do it in RubyMotion alone. Note that the label and picker are set up in viewDidLoad. The label gets updated in pickerView:didSelectRow:inComponent:
app_delegate.rb
class AppDelegate
def application(application, didFinishLaunchingWithOptions:launchOptions)
#window = UIWindow.alloc.initWithFrame(UIScreen.mainScreen.bounds)
#window.rootViewController = PickerDemo.new
#window.makeKeyAndVisible
true
end
end
picker_demo.rb
class PickerDemo < UIViewController
def viewDidLoad
view.backgroundColor = UIColor.whiteColor
#numLabel = UILabel.new
#numLabel.text = "Number Selected: 0"
#numLabel.font = UIFont.boldSystemFontOfSize(18)
#numLabel.frame = [[20,100],[260,120]]
#numLabel.numberOfLines = 2
#numLabel.adjustsFontSizeToFitWidth = true
view.addSubview(#numLabel)
#picker = UIPickerView.new
#picker.frame = [[0, 183], [320, 162]]
#picker.delegate = self
#picker.dataSource = self
view.addSubview(#picker)
end
def pickerView(pickerView, numberOfRowsInComponent:component)
101
end
def pickerView(pickerView, titleForRow:row, forComponent:component)
row.to_s
end
def numberOfComponentsInPickerView(pickerView)
1
end
def pickerView(pickerView, didSelectRow:row, inComponent:component)
#numLabel.text = "Number Selected: #{row}"
end
end