Flip between views-iOS - Appcelerator Titanium

app.js

var state = true;
var window = Titanium.UI.createWindow({
    backgroundColor: '#ffffff',
    height: Ti.UI.FILL,
    width: Ti.UI.FILL
});
 
var view = Ti.UI.createView({
    top:165,
    width:300,
    height:140
});
window.add(view);
 
var front = Ti.UI.createView({
    backgroundColor:'red',
    width:300,
    height:140,
    touchEnabled: false
});
 
var back = Titanium.UI.createView({
    backgroundColor:'green',
    width:300,
    height:140,
    touchEnabled: false
});
view.add(front);
 
view.addEventListener('click', function(e) {
    switch (state) {
    case true: 
        Ti.API.info('true');
        view.animate({
            view: back,
            transition:Ti.UI.iPhone.AnimationStyle.FLIP_FROM_LEFT
        });
        break;
    case false:
        Ti.API.info('false');
        view.animate({
            view: front,
            transition:Ti.UI.iPhone.AnimationStyle.FLIP_FROM_LEFT
        });
        break;
    }
    state = !state;
});
window.open();