async Task animateView(UIView view)
{
var size = view.Frame.Size;
var grow = new SizeF(size.Width * 1.7f, size.Height * 1.7f);
var shrink = new SizeF(size.Width * .4f, size.Height * .4f);
TaskCompletionSource <bool> tcs = new TaskCompletionSource <bool> ();
//Set the animation path
var pathAnimation = CAKeyFrameAnimation.GetFromKeyPath("position");
pathAnimation.CalculationMode = CAAnimation.AnimationPaced;
pathAnimation.FillMode = CAFillMode.Forwards;
pathAnimation.RemovedOnCompletion = false;
pathAnimation.Duration = .5;
UIBezierPath path = new UIBezierPath();
path.MoveTo(view.Center);
path.AddQuadCurveToPoint(new PointF(290, 34), new PointF(view.Center.X, View.Center.Y));
pathAnimation.Path = path.CGPath;
//Set size change
var growAnimation = CABasicAnimation.FromKeyPath("bounds.size");
growAnimation.To = NSValue.FromSizeF(grow);
growAnimation.FillMode = CAFillMode.Forwards;
growAnimation.Duration = .1;
growAnimation.RemovedOnCompletion = false;
var shrinkAnimation = CABasicAnimation.FromKeyPath("bounds.size");
shrinkAnimation.To = NSValue.FromSizeF(shrink);
shrinkAnimation.FillMode = CAFillMode.Forwards;
shrinkAnimation.Duration = .4;
shrinkAnimation.RemovedOnCompletion = false;
shrinkAnimation.BeginTime = .1;
CAAnimationGroup animations = new CAAnimationGroup();
animations.FillMode = CAFillMode.Forwards;
animations.RemovedOnCompletion = false;
animations.Animations = new CAAnimation[] {
pathAnimation,
growAnimation,
shrinkAnimation,
};
animations.Duration = .5;
animations.AnimationStopped += (sender, e) => {
tcs.TrySetResult(true);
};
view.Layer.AddAnimation(animations, "movetocart");
NSTimer.CreateScheduledTimer(.5, () => view.RemoveFromSuperview());
await tcs.Task;
}
public override void ViewDidLoad()
{
base.ViewDidLoad();
// Perform any additional setup after loading the view, typically from a nib.
button = new UIButton()
{
BackgroundColor = UIColor.FromHSBA(0.531f, 1, 1, 1),
Frame = new RectangleF(0, 0, 140, 140),
};
button.SetTitleColor(UIColor.White, UIControlState.Normal);
button.SetTitle("Tap to start", UIControlState.Normal);
button.Layer.CornerRadius = 70;
button.TouchUpInside += delegate {
var anim = button.PopAnimationForKey("bounce.me");
if (anim != null)
{
button.PopRemoveAnimationForKey("bounce.me");
button.SetTitle("Tap to start", UIControlState.Normal);
}
else
{
float size = 1;
NSValue fromValue = NSValue.FromSizeF(new SizeF(size, size));
NSValue toValue = NSValue.FromSizeF(new SizeF(1.4f, 1.4f));
POPSpringAnimation bounce = POPSpringAnimation.AnimationWithPropertyNamed(POPMutableAnimatableProperty.POPViewScaleXY);
bounce.SpringBounciness = 14;
bounce.FromValue = fromValue;
bounce.ToValue = toValue;
// Note: CompletionBlock is much more reliable than Finished
bounce.CompletionBlock = delegate(POPAnimation animation, bool finished) {
if (finished)
{
// Auto-reverse
var prevFrom = (animation as POPSpringAnimation).FromValue;
(animation as POPSpringAnimation).FromValue = (animation as POPSpringAnimation).ToValue;
(animation as POPSpringAnimation).ToValue = prevFrom;
button.PopAddAnimation(animation, "bounce.me");
}
};
button.PopAddAnimation(bounce, "bounce.me");
button.SetTitle("Tap to stop", UIControlState.Normal);
}
};
button.Center = View.Center;
View.Add(button);
}
