https://github.com/patridge/uigravitybehaviorrecipe

https://github.com/patridge/uigravitybehaviorrecipe

Last synced: 3 months ago
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• Host: GitHub
• URL: https://github.com/patridge/uigravitybehaviorrecipe
• Owner: patridge
• License: mit
• Created: 2013-09-25T04:15:59.000Z (over 11 years ago)
• Default Branch: master
• Last Pushed: 2019-02-19T19:52:40.000Z (over 6 years ago)
• Last Synced: 2025-01-01T10:25:24.754Z (5 months ago)
• Language: C#
• Size: 78.1 KB
• Stars: 1
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# Xamarin.iOS UIGravityBehavior Recipe

[See my blog for a [full write-up of this Xamarin UIGravityBehavior recipe](http://pdev.co/1gYRs1W).]

Playing with the new UIKit Dynamics `UIGravityBehavior`. Get a feel for the basic application of gravity with `BasicGravityViewController`.

    UIDynamicAnimator animator;

    public override void ViewDidLoad() {

        base.ViewDidLoad();

        View.BackgroundColor = UIColor.White;

        animator = new UIDynamicAnimator(View);

        var item = new UIView(new RectangleF(new PointF(50f, 0f), new SizeF(50f, 50f))) {

            BackgroundColor = UIColor.Blue,

        };

        View.Add(item);

        UIGravityBehavior gravity = new UIGravityBehavior(item);

        animator.AddBehavior(gravity);

    }

![Basic UIGravityBehavior](/Screenshots/BasicUIGravityBehavior.gif)

Then, play around with changing gravity in `ChangingGravityViewController`.

    View.AddGestureRecognizer(new UISwipeGestureRecognizer((gesture) => {

        gravity.GravityDirection = new CGVector(1, 0);

    }) { Direction = UISwipeGestureRecognizerDirection.Right, });

    View.AddGestureRecognizer(new UISwipeGestureRecognizer((gesture) => {

        gravity.GravityDirection = new CGVector(-1, 0);

    }) { Direction = UISwipeGestureRecognizerDirection.Left, });

    View.AddGestureRecognizer(new UISwipeGestureRecognizer((gesture) => {

        gravity.GravityDirection = new CGVector(0, -1);

    }) { Direction = UISwipeGestureRecognizerDirection.Up, });

    View.AddGestureRecognizer(new UISwipeGestureRecognizer((gesture) => {

        gravity.GravityDirection = new CGVector(0, 1);

    }) { Direction = UISwipeGestureRecognizerDirection.Down, });

![Controlling UIGravityBehavior by swipe](/Screenshots/ChangingUIGravityBehavior.gif)