Triggers allow you to express actions declaratively in XAML that change the appearance of controls based on events or property changes. In addition, state triggers, which are a specialized group of triggers, define when a VisualState should be applied. You can assign a trigger directly to a control, or add it to a page-level or app-level resource dictionary to be applied to multiple controls. Prop
![Xamarin.Forms Triggers - Xamarin](https://cdn-ak-scissors.b.st-hatena.com/image/square/d6e4cb632c7025e9f5e05fd314fbf6dcd6144e8d/height=288;version=1;width=512/https%3A%2F%2Flearn.microsoft.com%2Fen-us%2Fmedia%2Fopen-graph-image.png)