Loop through StackLayouts and children

Hi,

I can't figure this out.

I have multiple StackLayouts in my page (for every user). In every StackLayout I have a Switch.
When I click a button, I want to loop through every StackLayout and get a reference to the Switch. So I can get the Switch value for every user.

Can anyone help me with this problem? (I'm using Xamarin.Forms)

Many thanks in advance!