A loading screen that can be shown and hidden from anywhere within an application

app.js

// Include TiLoad library
Ti.include("TiLoad.js");

// Initialize TiLoad (param specifics if window rotates with device)
TiLoad.init({ rotate: false });

// Create a quick test application
var window = Ti.UI.createWindow({  
	title: "Loading Screen",
	layout: "vertical",
	backgroundColor: "#FFF"
});

var tab = Ti.UI.createTab({  
	title: "Loading Screen",
	window: window
});

var button = Ti.UI.createButton({
	width: 280,
	height: 44,
	title: "Show Loading Screen",
	top: 20,
	left: 20
});

button.addEventListener("click", function(e) {
	// Show the TiLoad screen
	TiLoad.show();
});

window.add(button);
var tabGroup = Ti.UI.createTabGroup();
tabGroup.addTab(tab);  
tabGroup.open();

TiLoad.js

var TiLoad = {
	visible: false,
	init: function(_properties) {
		var options;
		
		if(_properties && _properties.rotate) {
			options = {
				orientationModes: [
					Titanium.UI.LANDSCAPE_LEFT,
					Titanium.UI.LANDSCAPE_RIGHT,
					Titanium.UI.PORTRAIT,
					Titanium.UI.UPSIDE_PORTRAIT
				]
			};
		} else {
			options = {};
		}
		
		TiLoad.window = Ti.UI.createWindow(options);
		
		TiLoad.view = Ti.UI.createView({
			width: "100%",
			height: "100%",
			top: 0,
			left: 0,
			backgroundColor: "transparent"
		});
		
		TiLoad.background = Ti.UI.createView({
			width: "100%",
			height: "100%",
			top: 0,
			left: 0,
			backgroundColor: "#000",
			opacity: 0.8
		});
		
		TiLoad.spinner = Ti.UI.createActivityIndicator({
			width: "100%",
			height: "100%",
			top: 0,
			left: 0
		});
		
		if(Ti.Platform.osname == "iphone") {
			TiLoad.spinner.style = Titanium.UI.iPhone.ActivityIndicatorStyle.BIG;
		}
		
		TiLoad.view.addEventListener("click", TiLoad.hide, false);
		TiLoad.background.addEventListener("click", TiLoad.hide, false);
		TiLoad.spinner.addEventListener("click", TiLoad.hide, false);
		Ti.Gesture.addEventListener("orientationchange", TiLoad.size, false);
		
		TiLoad.spinner.show();
		TiLoad.view.add(TiLoad.background);
		TiLoad.view.add(TiLoad.spinner);
		TiLoad.window.add(TiLoad.view);
	},
	show: function() {
		TiLoad.size();
		
		if(!TiLoad.visible) {
			TiLoad.window.open();
		}
		
		TiLoad.visible = true;
	},
	hide: function() {
		if(TiLoad.visible) {
			TiLoad.window.close();
		}
		
		TiLoad.visible = false;
	},
	size: function(_event) {
		TiLoad.window.width = Titanium.Platform.displayCaps.platformWidth;
		TiLoad.window.height = Titanium.Platform.displayCaps.platformHeight;
	}
};