Create slide up picker views to give your user a nice way to make choices (for iOS)

Appcelerator Titanium "PickerView"

/**
 * @description: This is the iPhone version to create picker views on the fly  :-)
 * @author: Stephen G
 * @date:  04/11/2011
 * @screenshot: http://yfrog.com/h4vr6ep
 * 
 * @thanks to: http://cssgallery.info/making-a-combo-box-in-titanium-appcelerator-code-and-video/
 * 
 * Example of use (two different pickers using same function to create):
 * 
 * var data = [];
 * data.push(Titanium.UI.createPickerRow({ title : "Baseball", custom_item : "1" }));
 * data.push(Titanium.UI.createPickerRow({ title : "Basketball", custom_item : "2" }));
 * data.push(Titanium.UI.createPickerRow({ title : "Football", custom_item : "3" }));
 * var PickerSport = Controls.CreatePickerView(
 * 	Titanium.UI.currentWindow, 
 * 	data, 
 * 	true, 
 * 	function(row) {
 * 	      Titanium.API.info("You picked: " + row.title + "/" + row.custom_item);
 * 	}
 * );
 * 
 * PickerSport.Show();     // Shows the picker view (you call this)
 * PickerSport.Hide();		// Hides the picker view (called automatically from buttons inside the view)
 * 
 * data = [];
 * data.push(Titanium.UI.createPickerRow({ title : "Boston", custom_item : "1" }));
 * data.push(Titanium.UI.createPickerRow({ title : "New York", custom_item : "2" }));
 * data.push(Titanium.UI.createPickerRow({ title : "Miami", custom_item : "3" }));
 * var PickerLocation = Controls.CreatePickerView(
 * 	Titanium.UI.currentWindow, 
 * 	data, 
 * 	true, 
 * 	function(row) {
 * 	      Titanium.API.info("You picked: " + row.title + "/" + row.custom_item);
 * 	}
 * );
 * 
 * PickerLocation.Show();     // Shows the picker view (you call this)
 * PickerLocation.Hide();		// Hides the picker view (called automatically from buttons inside the view)
 * 
 */

var Controls = {};

Controls.CreatePickerView = function(wn, data, logEnabled, done) {
	/// <summary>Creates a slideup-ing View that holds a picker</summary>
	/// <param name="wn" type="Titanium.UI.Window">
	///      A reference to the Window to add this PickerView to
	/// </param>
	/// <param name="data" type="array of Titanium.UI.PickerRow">
	///      an array of data rows to add to the picker
	/// </param>
	/// <param name="logEnabled" type="boolean">
	///      Enabled logging inside this function
	/// </param>
	/// <param name="done" type="Function">
	///      The event to run when the user picks "done", function will be passed the Titanium.UI.PickerRow that they chose
	/// </param>
	/// <returns type="Titanium.UI.View" />
	var ThisControl = {
		"LogEnabled"		: logEnabled, 
		"Log"					: function(txt) {
			if (ThisControl.LogEnabled) { Titanium.API.info(txt); }
		}
	};	
	ThisControl.Log("Inside 'Controls.CreatePickerView' - Start");

	// The container view, which will be hidden along the bottom 
	ThisControl.View = Titanium.UI.createView({
		height					: 251,
		bottom					: -251
	});
	// Show the view holding the picker 
	ThisControl.ShowAnimation =  Titanium.UI.createAnimation({bottom:0});
	ThisControl.Show = function() {
		ThisControl.View.animate(ThisControl.ShowAnimation);
	};
	// Hide the view holding the picker 
	ThisControl.HideAnimation =  Titanium.UI.createAnimation({bottom:-251});
	ThisControl.Hide = function() {
		ThisControl.View.animate(ThisControl.HideAnimation);
	};
	ThisControl.Cancel =  Titanium.UI.createButton({
		title						: 'Cancel',
		style						: Titanium.UI.iPhone.SystemButtonStyle.BORDERED
	});
	ThisControl.Done =  Titanium.UI.createButton({
		title						: 'Done',
		style						: Titanium.UI.iPhone.SystemButtonStyle.DONE
	});
	ThisControl.Spacer =  Titanium.UI.createButton({
		systemButton		: Titanium.UI.iPhone.SystemButton.FLEXIBLE_SPACE
	});
	ThisControl.Toolbar =  Titanium.UI.createToolbar({
		top						: 0,
		items					: [ ThisControl.Cancel, ThisControl.Spacer, ThisControl.Done ]
	});
	ThisControl.Picker = Titanium.UI.createPicker({
			top					: 43
	});
	ThisControl.Picker.selectionIndicator = true;
	ThisControl.Done.addEventListener('click', function() {
		ThisControl.Log("Inside 'Controls.CreatePickerView' - Clicked 'Done'");
		ThisControl.Hide();
		done(ThisControl.Picker.getSelectedRow(0));
	});
	ThisControl.Cancel.addEventListener('click', function() {
		ThisControl.Log("Inside 'Controls.CreatePickerView' - Clicked 'Cancel'");
		ThisControl.Hide();
	});
	ThisControl.Picker.add(data);
	ThisControl.View.add(ThisControl.Toolbar);
	ThisControl.View.add(ThisControl.Picker);
	wn.add(ThisControl.View);

	ThisControl.Log("Inside 'Controls.CreatePickerView' - End");
	return ThisControl;
};

Sorry for the crappy unhelpful comment. I have created the controls.js file with your code from above, I'm including the file and then creating the control like this:

Titanium.include('controls.js');

var data = [];
data.push(Titanium.UI.createPickerRow({ title : "Baseball", custom_item : "1" }));
data.push(Titanium.UI.createPickerRow({ title : "Basketball", custom_item : "2" }));
data.push(Titanium.UI.createPickerRow({ title : "Football", custom_item : "3" }));

var PickerApp = Controls.CreatePickerView(Titanium.UI.currentWindow, data, true, function (e) {});

I'm getting this error:

[INFO] Inside 'Controls.CreatePickerView' - Start

[INFO] Inside 'Controls.CreatePickerView' - End

2011-09-27 14:33:14.318 Hamils Quotation Application[1383:207] -[UIPickerView setFrame:]: invalid height value 228.0 pinned to 216.0

I've tried this but my app has a tab bar at the bottom, and the view animation comes above the tab bar, reducing the remaining available screen space. Any idea how to get the popup to come from the bottom of the screen? Using the root window doesnt seem to work.

I'm not sure... sorry....

the code was written for many versions of Titanium ago.... something has obviously changed