can only be invoked from the UI thread

狀況說明

ui使用非同步呼叫方法後，ui沒有被更新

處理方式

Device.BeginInvokeOnMainThread ( () => {
  // interact with UI elements
});

This is the equivalent of InvokeOnMainThread on iOS, RunOnUiThread on Android, and Dispatcher.BeginInvoke on Windows Phone.

http://tirania.org/monomac/archive/2012/Sep-10.html https://developer.xamarin.com/guides/xamarin-forms/platform-features/device/

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