Refresh view in xamarin iOS - ios

Question

I'm new to Xamaring and iOS, but I'm trying to create a view that when the UIBarButtonSystemItem.Add is pressed, it adds a record to the SQLite database, alerts the user and then refreshes the screen as the screen draws out a button for each of the records in the table in SQLite.
Currently the add button code is:
this.NavigationItem.SetRightBarButtonItem(new UIBarButtonItem(UIBarButtonSystemItem.Add, (sender,args) => {
conn.Query<Job>("INSERT INTO Job (Job) VALUES(0)");
UIAlertView alSQL = new UIAlertView("Jobs","New job added",null,"ok",null);AllJobsScreen(), true);
alSQL.Show ();
}), true);
At present the data is added and the alert is shown, but I'm not sure of anyway to get the screen to reflect this new record in the database and add a new button.
I've looked online for refreshing the screen and can't find anything so any help would be great. Or if I'm going about this the wrong way, please let me know.
I'm writing out buttons on the screen, but ideally I need to be able to refresh any view with anything on it. At present the buttons are written out in a loop from a SQLite query as below:
UIButton btnTest = new UIButton (UIButtonType.System);
btnTest.Frame = new RectangleF(iTopLeftx, iTopLefty, 300, 30);
btnTest.SetTitle("J00000" + s.mJobID.ToString(),UIControlState.Normal);
btnTest.BackgroundColor = UIColor.Clear;
this.View.Add (btnTest);

Answer 1

Try changing the TitleColor, BorderColor and BorderWidth of your newly created UIButtons. Maybe your buttons are displayed on the view but you just can't see them.
UIButton btnTest = UIButton.FromType(UIButtonType.Custom);
btnTest.Frame = new RectangleF(iTopLeftx, iTopLefty, 300, 30);
btnTest.SetTitle("J00000" + s.mJobID.ToString(), UIControlState.Normal);
btnTest.SetTitleColor(UIColor.Black, UIControlState.Normal);
btnTest.Layer.BorderColor = UIColor.Black.CGColor;
btnTest.Layer.BorderWidth = 1;
btnTest.BackgroundColor = UIColor.Clear;
this.View.Add(btnTest);
EDIT
Then the problem seems to be that you didn't remove previously added UIButtons. Try to hold your collection of UIButtons in a list or an array.
List<UIButton> buttonList;
Then populate your buttonList:
private void PopulateSubviews()
{
for (int i=0; i<count; i++)
{
UIButton btnTest = UIButton.FromType(UIButtonType.Custom);
// previous code withoud this.View.Add(...);
...
buttonList.Add(btnTest);
}
}
And have these two methods:
private void ClearView()
{
foreach (UIButton btn in buttonList)
{
btn.RemoveFromSuperview();
}
buttonList.Clear();
}
private void InitializeSubviews()
{
foreach (UIButton btn in buttonList)
{
this.View.AddSubview(btn);
}
}
And to refresh your views:
private void ReloadSubviews()
{
ClearView();
PopulateSubviews();
InitializeSubviews();
}