/// <summary>
/// Loop through our list of tabs and create a UIButton to represent each one. Add this button to our tabsScrollView
/// We also update the content size property of our scroll view as we add buttons
/// </summary>
void RefreshTabs()
{
if (customButtonArray != null)
{
foreach (var button in customButtonArray)
{
button.TouchUpInside -= HandleTouchUpInside;
button.RemoveFromSuperview();
button.Dispose();
}
}
// lets also get a dictionary with index-values and X.Forms Pages for the different content pages we've defined for our TabbedPage - we will use this to change the displayed page based on the selected tab
pagesDictionary = new Dictionary <int, Page> ();
if (_tabbedPage.Children != null && _tabbedPage.Children.Count > 0)
{
nfloat contentOffset = 0f;
customButtonArray = new CustomTabButton[_tabbedPage.Children.Count];
for (var tabIndex = 0; tabIndex < _tabbedPage.Children.Count; tabIndex++)
{
var childTab = _tabbedPage.Children [tabIndex];
var btn = new CustomTabButton();
btn.SetTitle(childTab.Title.ToUpper(), UIControlState.Normal);
btn.SetTitleColor(UIColor.Black, UIControlState.Normal);
btn.SetTitleColor(UIColor.Red, UIControlState.Highlighted);
btn.Tag = (nint)tabIndex; // set the tag of the button to correspond to the tab index for use in click handling
btn.TouchUpInside += HandleTouchUpInside;
if (CustomTabButton.MinimumWidth * _tabbedPage.Children.Count < _tabScrollView.Frame.Width)
{
btn.SetButtonWidth((float)_tabScrollView.Frame.Width / _tabbedPage.Children.Count);
}
btn.Frame = new CGRect(contentOffset, 0, btn.Frame.Width, btn.Frame.Height);
contentOffset += btn.Frame.Size.Width; // update this value each time we are adding a new button
customButtonArray.SetValue(btn, tabIndex);
_tabScrollView.AddSubview(btn);
//keep track of the index <-> page link
pagesDictionary.Add(tabIndex, childTab);
}
_tabScrollView.ContentSize = new CGSize(contentOffset, _tabScrollView.Frame.Height); // update the content size of our scroll view to allow for scrolling
var selectedBtn = GetButtonForCurrentPage();
if (selectedBtn != null)
{
selectTabButton(selectedBtn);
}
}
}
/// <summary>
/// Updates all the buttons and gives the selected one its selected appearence
/// </summary>
/// <param name="btn">Button.</param>
void selectTabButton(CustomTabButton btn)
{
if (btn != null)
{
btn.SetButtonSelected();
foreach (var button in customButtonArray)
{
if (button != btn)
{
button.SetButtonDeselected();
}
}
_tabScrollView.ScrollRectToVisible(btn.Frame, true);
HandleCurrentPageChanged((int)btn.Tag);
}
}