UIView appereance from bottom to top and vice versa(Core Animation)

Question

My goal is to understand and implement feature via Core Animation.
I think it's not so hard,but unfortunately i don't know swift/Obj C and it's hard to understand native examples.

---

Visual implementation

So what exactly i want to do(few steps as shown on images):
1.
2.
3.
4.

And the same steps to hide view(vice versa,from top to bottom) until this :

Also,i want to make this UIView more generic,i mean to put this UIView on my StoryBoard and put so constraints on AutoLayout(to support different device screens).

Any ideas? Thanks!

Answer 1

Assuming the original view is something like:

var view = new UIView(new CGRect(View.Frame.Left, View.Frame.Height - 200, View.Frame.Right, 0));
view.BackgroundColor = UIColor.Clear;

Show:

UIView.Animate(2.0, 0.0,
    UIViewAnimationOptions.CurveLinear,
    () =>
        {
            view.BackgroundColor = UIColor.Blue;
            var height = 100;
            view.Frame = new CGRect(View.Frame.Left, view.Frame.Y - height , view.Superview.Frame.Right, height);
        },
    () =>
        {
            // anim done
        }                                  
);

Hide:

UIView.Animate(2.0, 0.0,
    UIViewAnimationOptions.CurveLinear,
    () =>
        {
            view.BackgroundColor = UIColor.Clear;
            var height = 100;
            view.Frame = new CGRect(View.Frame.Left, view.Frame.Y + height, view.Superview.Frame.Right, 0);

        },
    () =>
        {
            view.Hidden = true;
        }
);