// The ViewDidLoad() method is called when the view is first requested by the application.
// The "async" keyword is added here to the override in order to allow other awaited async method calls inside the override to be called ascynchronously.
public override async void ViewDidLoad()
{
base.ViewDidLoad();
// tell the table view source to load the data
await _AcquaintanceTableViewSource.LoadAcquaintances();
SetTableViewProperties();
// override the back button text for AcquaintanceDetailViewController (the navigated-to view controller)
NavigationItem.BackBarButtonItem = new UIBarButtonItem("List", UIBarButtonItemStyle.Plain, null);
}
// The ViewDidLoad() method is called when the view is first requested by the application.
// The "async" keyword is added here to the override in order to allow other awaited async method calls inside the override to be called ascynchronously.
public override async void ViewDidLoad()
{
base.ViewDidLoad();
// tell the table view source to load the data
await _AcquaintanceTableViewSource.LoadAcquaintances();
SetTableViewProperties();
}
async Task RefreshAcquaintances()
{
// ! flag to indicate how this refresh command was instantiated.
bool triggeredByPullToRefresh = false;
// Store the original offset of the TableView.
var originalOffset = new CGPoint(TableView.ContentOffset.X, TableView.ContentOffset.Y);
// If
if (RefreshControl.Refreshing)
{
triggeredByPullToRefresh = true;
}
try
{
// If this refresh has not been started by a pull-to-refresh UI action, then we need to manually set the tableview offset to SHOW the refresh indicator.
if (!triggeredByPullToRefresh)
{
TableView.SetContentOffset(new CGPoint(originalOffset.X, originalOffset.Y - RefreshControl.Frame.Size.Height), true);
}
// Starts animating the refreshing indicator, and sets its Refreshing property to true.
RefreshControl.BeginRefreshing();
// request the TableViewSource to load acquaintances
await _AcquaintanceTableViewSource.LoadAcquaintances();
// Tell the TableView to update its UI (reload the cells) because the TableViewSource has updated.
TableView.ReloadData();
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine($"Error getting acquaintances: {ex.Message}");
// present an alert about the failure
using (var alert = new UIAlertView("Error getting acquaintances", "Ensure you have a network connection, and that a valid backend service URL is present in the app settings.", null, "OK"))
{
alert.Show();
}
}
finally
{
// Starts animating the refreshing indicator, and sets its Refreshing property to false.
RefreshControl.EndRefreshing();
// If this refresh has not been started by a pull-to-refresh UI action, then we need to manually set the tableview offset to HIDE the refresh indicator.
if (!triggeredByPullToRefresh)
{
TableView.SetContentOffset(originalOffset, true);
}
}
}