private void UpdateViews()
{
while (this.Subviews.Count() > 0)
this.Subviews.Last().RemoveFromSuperview();
//Remove old views
var oldViews = _views.Where(v => _viewControllers.Contains(v.ViewController) == false).ToList();
oldViews.ForEach(v => _views.Remove(v));
foreach (var viewController in _viewControllers)
{
var view = _views.Where(v => v.ViewController == viewController).FirstOrDefault();
if ( view == null )
{
view = new TabBarItem();
view.ViewController = viewController;
view.Button = UIButton.FromType(UIButtonType.Custom);
view.Button.BackgroundColor = UIColor.Clear;
view.Button.TouchUpInside += (sender, e) =>
{
var button = sender as UIButton;
if ( button == null ) return;
var tabItem = _views.FirstOrDefault(v => v.Button == button);
if ( tabItem != null)
SelectView(tabItem.ViewController);
};
_views.Insert(_viewControllers.IndexOf(viewController), view);
}
}
int actionButtonWidth = 44;
int actionButtonHeight = 56;
int actionButtonOffset = (int)(this.Frame.Width / 2) - actionButtonWidth / 2;
int buttonWidth = (int)((this.Frame.Width - actionButtonWidth) / (_views.Count == 1 ? 2 : _views.Count));
int buttonHeight = 44;
for (int i = 0; i < _views.Count; i++)
{
var view = _views[i];
float offset = i * buttonWidth;
if (offset >= actionButtonOffset)
offset += actionButtonWidth;
view.Button.Frame = new System.Drawing.RectangleF(offset, this.Frame.Height - buttonHeight, buttonWidth, buttonHeight);
view.Button.SetTitle(view.ViewController.Title, UIControlState.Normal);
AddSubview(view.Button);
}
// Add action button
if ( _actionButton == null )
{
_actionButton = UIButton.FromType(UIButtonType.Custom);
_actionButton.BackgroundColor = UIColor.Green;
_actionButton.Frame = new System.Drawing.RectangleF(actionButtonOffset, this.Frame.Height - actionButtonHeight, actionButtonWidth, actionButtonHeight);
_actionButton.TouchUpInside += Handle_ActionButtonTouchUpInside;
}
AddSubview(_actionButton);
SetNeedsLayout();
}
private void MakeViewActive(TabBarItem tabItem)
{
if ( tabItem == null || _parentController == null)
return;
var selectedView = _views.Where(v => v.IsSelected).FirstOrDefault();
if ( selectedView == tabItem )
return;
tabItem.IsSelected = true;
/*
//This animates the entire window but works properly
if (selectedView != null )
UIView.Transition(selectedView.ViewController.View, tabItem.ViewController.View, 1,
UIViewAnimationOptions.BeginFromCurrentState | UIViewAnimationOptions.CurveEaseInOut | UIViewAnimationOptions.TransitionCurlDown,
() =>
{
selectedView.ViewController.View.RemoveFromSuperview();
selectedView.ViewController.RemoveFromParentViewController();
tabItem.ViewController.View.Frame = new System.Drawing.RectangleF(0, 0, this.Frame.Width, _parentController.View.Frame.Height - this.Frame.Height);
_parentController.View.InsertSubview(tabItem.ViewController.View, 0);
_parentController.AddChildViewController(tabItem.ViewController);
});
*/
/*
//This will animate specific area but doesn't use current state
UIView.BeginAnimations("View Flip");
UIView.SetAnimationDuration(1);
UIView.SetAnimationCurve(UIViewAnimationCurve.EaseInOut);
UIView.SetAnimationTransition(UIViewAnimationTransition.CurlDown, tabItem.ViewController.View, true);
UIView.SetAnimationBeginsFromCurrentState(true);
*/
//don't execute code below if using either animation
tabItem.ViewController.ViewWillAppear(true);
if (selectedView != null )
{
selectedView.ViewController.ViewWillDisappear(true);
selectedView.ViewController.View.RemoveFromSuperview();
selectedView.ViewController.RemoveFromParentViewController();
selectedView.ViewController.ViewDidDisappear(true);
}
int width = 0;
int height = 0;
if ( UIDevice.CurrentDevice.Orientation == UIDeviceOrientation.Portrait ||
UIDevice.CurrentDevice.Orientation == UIDeviceOrientation.PortraitUpsideDown ||
UIDevice.CurrentDevice.Orientation == UIDeviceOrientation.Unknown)
{
width = (int)_parentController.View.Frame.Width;
height = (int)_parentController.View.Frame.Height;
}
else if (UIDevice.CurrentDevice.Orientation == UIDeviceOrientation.LandscapeLeft ||
UIDevice.CurrentDevice.Orientation == UIDeviceOrientation.LandscapeRight)
{
height = (int)_parentController.View.Frame.Width;
width = (int)_parentController.View.Frame.Height;
}
tabItem.ViewController.View.Frame = new System.Drawing.RectangleF(0, 0, width, height - this.Frame.Height);
_parentController.View.InsertSubview(tabItem.ViewController.View, 0);
_parentController.AddChildViewController(tabItem.ViewController);
tabItem.ViewController.ViewDidAppear(true);
//UIView.CommitAnimations();
var tabItems = _views.Where (v => v != tabItem);
foreach (var item in tabItems)
item.IsSelected = false;
}