iOS createDocumentViewer

app.js

var win = Titanium.UI.createWindow({
  title : 'Window',
	backgroundColor : '#fff',
	className : 'navBarColor',
	translucent : false
});

var scrollingView = Ti.UI.createScrollView({
	top : 0,
	left : 0,
	right : 0,
	bottom : 0
});
win.add(scrollingView);

var docButton = Titanium.UI.createButton({
	top : 10,
	right : 10,
	height : 30,
	width : 200,
	style : Titanium.UI.iPhone.SystemButtonStyle.BORDERED,
	title : 'View Document'
});
scrollingView.add(docButton);

var displayProposal = function() {
	var downloadDir = Titanium.Filesystem.getFile(Titanium.Filesystem.applicationDataDirectory, '');
	Ti.API.info('downloadDir: ' + downloadDir);
	var downloadFile = Titanium.Filesystem.getFile(downloadDir.nativePath, 'doc.pdf');
	Ti.API.info('downloadFile: ' + downloadFile);
	var downloadFilePath = downloadFile.nativePath;
	Ti.API.info('downloadFilePath: ' + downloadFilePath);
	var docViewer = Titanium.UI.iOS.createDocumentViewer({
		url : 'doc.pdf'
	});
	docViewer.show();
	setTimeout(function() {
		docViewer.hide();
	}, 5000);
}
docButton.addEventListener('click', function(e) {
	displayProposal();
});

win.open();