Using NSTimer to call SetNeedsDisplay in Xamarin for iOS

Question

I have a UIView that takes data (thats changing) from a buffer and plots it. I want the screen udpated at 10Hz. The UIView is called pane, and this is how i'm invoking it inside the ViewController:

        //create graphics to display data
        GraphPane pane = new GraphPane ();
        pane.Frame = UIScreen.MainScreen.Bounds;
        Add (pane); 

        //setup timer to update pane
        NSTimer timer = NSTimer.CreateRepeatingTimer (0.1, delegate {pane.SetNeedsDisplay ();});

This isn't working (Pane.Draw is never called), and I've not found a good example of how to do this. Any suggestions are appreciated.

I actually have timer defined as a class variable so it shouldn't. — reza, Jun 14 '13 at 01:01

score 11 · Accepted Answer · answered Jun 14 '13 at 02:16

11

        timer = NSTimer.CreateRepeatingScheduledTimer (TimeSpan.FromSeconds (0.1), delegate {
            pane.SetNeedsDisplay ();
        });

fixed my issue.

answered Jun 14 '13 at 02:16

reza

1,329
2
22
37

The change was from CreateReapeatingTimer to CreateRepeatingScheduledTimer - seems it isn't scheduled by default. – reza Jun 14 '13 at 02:18

Using NSTimer to call SetNeedsDisplay in Xamarin for iOS

1 Answers1