Why is UILabel not updating? - xamarin.ios

Question

I have created a view that shows lost connection messages to users which pops over the current view. I want to update the view periodically based on connection status changes.
I can properly get the view and change the text of a label (verified with WriteLines), but nothing changes on the actual display. I even tried removing the view and readding it and calling SetNeedsDisplay, but nothing seems to help.
I have a global variable called OverView:
public static UIView OverView;
I create the label subview, add it to the overview and pop the overview in front of the current view:
UILabel labelTitle = new UILabel();
labelTitle.Text = title;
UIView labelTitleView = (UIView) labelTitle;
labelTitleView.Tag = 5000;
OverView.AddSubview(labelTitleView);
curView.InsertSubviewAbove(OverView, curView);
curView.BringSubviewToFront(OverView);
And then at a later time, I try to modify it like this from another function:
if ((OverView != null) && (OverView.Subviews != null))
{
for (int i = 0; i < OverView.Subviews.Length; i++)
{
WriteToConsole("Type: " + OverView.Subviews[i].GetType());
if (OverView.Subviews[i] is UILabel)
{
WriteToConsole("Found Label with Tag: " + ((UILabel)(OverView.Subviews[i])).Tag + " Text: " + ((UILabel)(OverView.Subviews[i])).Text);
if (((UILabel)(OverView.Subviews[i])).Tag == 5000)
{
WriteToConsole("Setting subview Title to: " + lostConnectionTitle);
lock (overViewLocker)
{
appReference.InvokeOnMainThread(delegate
{
UILabel tempLabel = ((UILabel)(OverView.Subviews[i]));
tempLabel.Text = lostConnectionTitle;
OverView.Subviews[i].RemoveFromSuperview();
OverView.AddSubview(tempLabel);
OverView.BringSubviewToFront(tempLabel);
OverView.SetNeedsLayout();
OverView.SetNeedsDisplay();
WriteToConsole("SetNeedsDisplay");
});
}
}
}
}
}

Answer 1

Have you tried to use delegate methods on your label, and change their value when events occur ?
For example, if your event is clicking on a button, you should have something like that:
yourLabel.Text = "Init";
buttonExample.TouchUpInside += (sender, e) => {
yourLabel.Text = "I touched my button";
};
When your View loads, you'll see "Init" and your button and once you click on it, the label text changed.
Xamarin has some explanation about events and delegate methods here.
I hope that helped.