Device.StartTimer(TimeSpan, Func<Boolean>) Method
Definition
Important
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Starts a recurring timer using the device clock capabilities.
public static void StartTimer (TimeSpan interval, Func<bool> callback);static member StartTimer : TimeSpan * Func<bool> -> unitParameters
- interval
- System.TimeSpan
The interval between invocations of the callback.
- callback
- System.Func<System.Boolean>
The action to run when the timer elapses.
Remarks
While the callback returns true, the timer will keep recurring.
If you want the code inside the timer to interact on the UI thread (e.g. setting text of a Label or showing an alert), it should be done within a BeginInvokeOnMainThread expression, which will be nested inside the timer (see below).
Device.StartTimer (new TimeSpan (0, 0, 60), () =>
{
// do something every 60 seconds
Device.BeginInvokeOnMainThread (() =>
{
// interact with UI elements
});
return true; // runs again, or false to stop
});