Titanium.UI.iOS.CollisionBehavior

The following example creates many blocks scattered across the top of the window, which start falling after the window opens. The item and boundary collisions are reported to the console.

var win = Ti.UI.createWindow({backgroundColor: 'white', fullscreen: true});

// Create an Animator object using the window as the coordinate system
var animator = Ti.UI.iOS.createAnimator({referenceView: win});

// Create a default collision behavior, using the window edges as boundaries
var collision = Ti.UI.iOS.createCollisionBehavior();

// Listen for collisions
function report(e) {
    Ti.API.info(JSON.stringify(e.type));
};
collision.addEventListener('itemcollision', report);
collision.addEventListener('boundarycollision', report);

// Simulate Earth's gravity
var gravity = Ti.UI.iOS.createGravityBehavior({
    gravityDirection: {x: 0.0, y: 1.0}
});

var WIDTH = Ti.Platform.displayCaps.platformWidth;
var HEIGHT = Ti.Platform.displayCaps.platformHeight;

// Create a bunch of random blocks; add to the window and behaviors
var blocks = [];   
for (var i = 0; i < 25; i++) {
    var r = Math.round(Math.random() * 255);
    var g = Math.round(Math.random() * 255);
    var b = Math.round(Math.random() * 255);
    var rgb = 'rgb(' + r +"," + g + "," + b + ")";

    blocks[i] = Ti.UI.createView({
        width: 25,
        height: 25,
        top: Math.round(Math.random() * (HEIGHT / 4) + 25),
        left: Math.round(Math.random() * (WIDTH - 25) + 25),
        backgroundColor: rgb
    });
    win.add(blocks[i]);
    collision.addItem(blocks[i]);
    gravity.addItem(blocks[i]);
}

animator.addBehavior(collision);
animator.addBehavior(gravity);

// Start the animation when the window opens
win.addEventListener('open', function(e){
    animator.startAnimator();
});

win.open();