Xamarin.Forms Layouts

Artikkeli
05/21/2018

Xamarin.Forms Layouts are used to compose user-interface controls into visual structures.

The Layout and Layout<T> classes in Xamarin.Forms are specialized subtypes of views that act as containers for views and other layouts. The Layout class itself derives from View. A Layout derivative typically contains logic to set the position and size of child elements in Xamarin.Forms applications.

The classes that derive from Layout can be divided into two categories:

Layouts with Single Content

These classes derive from Layout, which defines Padding and IsClippedToBounds properties:

Type	Description	Appearance
`ContentView`	`ContentView` contains a single child that is set with the `Content` property. The `Content` property can be set to any `View` derivative, including other `Layout` derivatives. `ContentView` is mostly used as a structural element and serves as a base class to `Frame`. API Documentation / Guide	C# code for this page / XAML page
`Frame`	The `Frame` class derives from `ContentView` and displays a border, or frame, around its child. The `Frame` class has a default `Padding` value of 20, and also defines `BorderColor`, `CornerRadius`, and `HasShadow` properties. API Documentation / Guide	C# code for this page / XAML page
`ScrollView`	`ScrollView` is capable of scrolling its contents. Set the `Content` property to a view or layout too large to fit on the screen. (The content of a `ScrollView` is very often a `StackLayout`.) Set the `Orientation` property to indicate if scrolling should be vertical, horizontal, or both. API Documentation / Guide	C# code for this page / XAML page
`TemplatedView`	`TemplatedView` displays content with a control template, and is the base class for `ContentView`. API Documentation / Guide
`ContentPresenter`	`ContentPresenter` is a layout manager for templated views, used within a `ControlTemplate` to mark where the content that is to be presented appears. API Documentation / Guide

Layouts with Multiple Children

These classes derive from Layout<View>:

Type	Description	Appearance
`StackLayout`	`StackLayout` positions child elements in a stack either horizontally or vertically based on the `Orientation` property. The `Spacing` property governs the spacing between the children, and has a default value of 6. API Documentation / Guide	C# code for this page / XAML page
`Grid`	`Grid` positions its child elements in a grid of rows and columns. A child's position is indicated using the attached properties `Row`, `Column`, `RowSpan`, and `ColumnSpan`. API Documentation / Guide	C# code for this page / XAML page
`AbsoluteLayout`	`AbsoluteLayout` positions child elements at specific locations relative to its parent. A child's position is indicated using the attached properties `LayoutBounds` and `LayoutFlags`. An `AbsoluteLayout` is useful for animating the positions of views. API Documentation / Guide	C# code for this page / XAML page with code-behind
`RelativeLayout`	`RelativeLayout` positions child elements relative to the `RelativeLayout` itself or to their siblings. A child's position is indicated using the attached properties that are set to objects of type `Constraint` and `BoundsConstraint`. API Documentation / Guide	C# code for this page / XAML page
`FlexLayout`	`FlexLayout` is based on the CSS Flexible Box Layout Module, commonly known as flex layout or flex-box. `FlexLayout` defines six bindable properties and five attached bindable properties that allow children to be stacked or wrapped with many alignment and orientation options. API Documentation / Guide	C# code for this page / XAML page