public override void ViewDidLayoutSubviews()
{
base.ViewDidLayoutSubviews();
if (isViewAppearing || isViewRotating)
{
// Force the UICollectionViewFlowLayout to get laid out again with the new size if
// a) The view is appearing. This ensures that
// collectionView:layout:sizeForItemAtIndexPath: is called for a second time
// when the view is shown and when the view *frame(s)* are actually set
// (we need the view frame's to have been set to work out the size's and on the
// first call to collectionView:layout:sizeForItemAtIndexPath: the view frame(s)
// aren't set correctly)
// b) The view is rotating. This ensures that
// collectionView:layout:sizeForItemAtIndexPath: is called again and can use the views
// *new* frame so that the buttonBarView cell's actually get resized correctly
CachedCellWidths = CalculateWidths();
ButtonBarView.CollectionViewLayout.InvalidateLayout();
// When the view first appears or is rotated we also need to ensure that the barButtonView's
// selectedBar is resized and its contentOffset/scroll is set correctly (the selected
// tab/cell may end up either skewed or off screen after a rotation otherwise)
ButtonBarView.MoveToIndex((int)CurrentIndex, animated: false, swipeDirection: SwipeDirection.None, pagerScroll: PagerScroll.ScrollOnlyIfOutOfScreen);
ButtonBarView.SelectItem(NSIndexPath.FromRowSection((System.nint)CurrentIndex, 0), false, UICollectionViewScrollPosition.None);
}
}
public override void ReloadPagerTabStripView()
{
base.ReloadPagerTabStripView();
if (IsViewLoaded)
{
ButtonBarView.ReloadData();
cachedCellWidths = CalculateWidths();
ButtonBarView.MoveToIndex((int)CurrentIndex, animated: false, swipeDirection: SwipeDirection.None, pagerScroll: PagerScroll.Yes);
}
}
public override void ViewDidLoad()
{
base.ViewDidLoad();
if (ButtonBarView == null)
{
ButtonBarView = InitializeButtonBarView();
}
if (CachedCellWidths == null)
{
CachedCellWidths = CalculateWidths();
}
if (ButtonBarView.Superview == null)
{
View.AddSubview(ButtonBarView);
}
if (ButtonBarView.Delegate == null)
{
ButtonBarView.Delegate = this;
}
if (ButtonBarView.DataSource == null)
{
ButtonBarView.DataSource = this;
}
ButtonBarView.ScrollsToTop = false;
var flowLayout = ButtonBarView.CollectionViewLayout as UICollectionViewFlowLayout;
flowLayout.ScrollDirection = UICollectionViewScrollDirection.Horizontal;
flowLayout.MinimumInteritemSpacing = Settings.Style.ButtonBarMinimumInteritemSpacing ?? flowLayout.MinimumLineSpacing;
flowLayout.MinimumLineSpacing = Settings.Style.ButtonBarMinimumLineSpacing ?? flowLayout.MinimumLineSpacing;
var sectionInset = flowLayout.SectionInset;
flowLayout.SectionInset = new UIEdgeInsets(sectionInset.Top, Settings.Style.ButtonBarLeftContentInset ?? sectionInset.Left,
sectionInset.Bottom, Settings.Style.ButtonBarRightContentInset ?? sectionInset.Right);
ButtonBarView.ShowsHorizontalScrollIndicator = false;
ButtonBarView.BackgroundColor = Settings.Style.ButtonBarBackgroundColor ?? ButtonBarView.BackgroundColor;
ButtonBarView.SelectedBar.BackgroundColor = Settings.Style.SelectedBarBackgroundColor;
ButtonBarView.SelectedBarHeight = Settings.Style.SelectedBarHeight ?? ButtonBarView.SelectedBarHeight;
ButtonBarView.SelectedBarWidth = Settings.Style.SelectedBarWidth ?? ButtonBarView.SelectedBarWidth;
ButtonBarView.SelectedBarVerticalAlignment = Settings.Style.SelectedBarVerticalAlignment;
//register button bar item cell
if (ButtonBarItemSpec.NibName != null)
{
ButtonBarView.RegisterNibForCell(UINib.FromName(ButtonBarItemSpec.NibName, ButtonBarItemSpec.Bundle), "Cell");
}
else
{
ButtonBarView.RegisterClassForCell(typeof(ButtonBarViewCell), "Cell");
}
}
public void PagerTabStripViewController(PagerTabStripViewController pagerTabStripViewController, int fromIndex, int toIndex, nfloat progressPercentage, bool indexWasChanged)
{
if (shouldUpdateButtonBarView)
{
ButtonBarView.MoveFromIndex(fromIndex, toIndex: toIndex, progressPercentage: progressPercentage, pagerScroll: PagerScroll.Yes);
if (ChangeCurrentIndexProgressive != null)
{
var oldCell = ButtonBarView.CellForItem(NSIndexPath.FromItemSection(new nint(CurrentIndex != fromIndex ? fromIndex : toIndex), 0)) as ButtonBarViewCell;
var newCell = ButtonBarView.CellForItem(NSIndexPath.FromItemSection(new nint(CurrentIndex), 0)) as ButtonBarViewCell;
ChangeCurrentIndexProgressive(oldCell, newCell, progressPercentage, indexWasChanged, true);
}
}
}
public void PagerTabStripViewController(PagerTabStripViewController pagerTabStripViewController, int fromIndex, int toIndex)
{
if (shouldUpdateButtonBarView)
{
ButtonBarView.MoveToIndex(toIndex, animated: true, swipeDirection: toIndex < fromIndex ? SwipeDirection.Right : SwipeDirection.Left, pagerScroll: PagerScroll.Yes);
if (ChangeCurrentIndex != null)
{
var oldCell = ButtonBarView.CellForItem(NSIndexPath.FromItemSection(new nint(CurrentIndex != fromIndex ? fromIndex : toIndex), 0)) as ButtonBarViewCell;
var newCell = ButtonBarView.CellForItem(NSIndexPath.FromItemSection(new nint(CurrentIndex), 0)) as ButtonBarViewCell;
ChangeCurrentIndex(oldCell, newCell, true);
}
}
}
private ButtonBarView InitializeButtonBarView()
{
UICollectionViewFlowLayout flowLayout = new UICollectionViewFlowLayout();
flowLayout.ScrollDirection = UICollectionViewScrollDirection.Horizontal;
var buttonBarHeight = new nfloat(Settings.Style.ButtonBarHeight ?? 44f);
var buttonBar = new ButtonBarView(frame: new CGRect(0, 0, View.Frame.Size.Width, buttonBarHeight), layout: flowLayout);
buttonBar.BackgroundColor = Settings.Style.ButtonBarBackgroundColor ?? UIColor.Orange;
buttonBar.SelectedBar.BackgroundColor = Settings.Style.SelectedBarBackgroundColor ?? UIColor.Black;
buttonBar.AutoresizingMask = UIViewAutoresizing.FlexibleWidth;
var newContainerViewFrame = new CGRect(ContainerView.Frame.X, buttonBarHeight, ContainerView.Frame.Size.Width, ContainerView.Frame.Size.Height - (buttonBarHeight - ContainerView.Frame.Y));
ContainerView.Frame = newContainerViewFrame;
return(buttonBar);
}
public void ItemSelected(UICollectionView collectionView, NSIndexPath indexPath)
{
if (indexPath.Item != CurrentIndex)
{
ButtonBarView.MoveToIndex((int)indexPath.Item, true, SwipeDirection.None, PagerScroll.Yes);
shouldUpdateButtonBarView = false;
var oldCell = ButtonBarView.CellForItem(NSIndexPath.FromItemSection(new nint(CurrentIndex), 0)) as ButtonBarViewCell;
var newCell = ButtonBarView.CellForItem(NSIndexPath.FromItemSection(indexPath.Item, 0)) as ButtonBarViewCell;
if (PagerBehaviour.IsProgressiveIndicator)
{
ChangeCurrentIndexProgressive?.Invoke(oldCell, newCell, 1, true, true);
}
else
{
ChangeCurrentIndex?.Invoke(oldCell, newCell, true);
}
MoveToViewControllerAtIndex((uint)indexPath.Item);
}
}
public override void ViewWillAppear(bool animated)
{
base.ViewWillAppear(animated);
ButtonBarView.LayoutIfNeeded();
}