andresbrun

let pushContinousBehaviour = UIPushBehavior(items: [targetView], mode: .continuous)
animator.addBehavior(pushContinousBehaviour)

// Using pushDirection
pushContinousBehaviour.pushDirection = CGVector(dx: 50, dy: 0)

// Using magnitude and angle
pushContinousBehaviour.magnitude = 50
pushContinousBehaviour.angle = 0

andresbrun

let animator = UIDynamicAnimator(referenceView: containerView)

let gravityBehaviour = UIGravityBehavior(items: [targetView])
gravityBehaviour.magnitude = 1.0 // gravity on earth
animator.addBehavior(gravityBehaviour)

andresbrun

import UIKit
import PlaygroundSupport

let containerView = UIView(frame: CGRect(x: 0.0, y: 0.0, width: 320.0, height: 480.0))

// Play with containerView
let targetView = UIView(frame: CGRect(x: containerView.bounds.midX, 
                                      y: containerView.bounds.midY, 
                                      width: 50.0, 
                                      height: 50.0))