问题 I have a login page using a StackLayout for the content (username, password, login button). After the user clicks the login button, I want a "loading" block set in the absolute center of the page, on top of the existing StackLayout content. For some annoying reason, this is not straightforward. It seems like a simple, common thing to do - how is this done? 回答1: You used a right tag: AbsoluteLayout. var loadingView = new StackLayout { Padding = 6, Orientation = StackOrientation.Horizontal,