堆棧式地放置內(nèi)容
可以在xaml中完成視圖，也可以在cs代碼中完成視圖

Xamarin的所有視圖和布局都是可以
1.在xaml中完成
2.在cs代碼中完成視圖
（類比WPF）

示例

在cs代碼中完成視圖

var red = new Label
{
    Text = "Stop",
    BackgroundColor = Color.Red,
    FontSize = 20
};
var yellow = new Label
{
    Text = "Slow down",
    BackgroundColor = Color.Yellow,
    FontSize = 20
};
var green = new Label
{
    Text = "Go",
    BackgroundColor = Color.Green,
    FontSize = 20
};

//內(nèi)容
Content = new StackLayout
{
    //間距
    Spacing = 10,
    Children = { red, yellow, green }
};

在xaml中完成視圖

這里注意默認(rèn)生成的是Page,不是ContentPage，要手動(dòng)修改，不然無效

<ContentPage 
    x:Class="XamarinDemo.DemoPages.StackLayoutExample"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:XamarinDemo.DemoPages"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d" Padding="20">
    <StackLayout Spacing="10">
        <Label Text="Stop" BackgroundColor="Red" Font="20"/>
        <Label Text="Slow down" BackgroundColor="Yellow" Font="20" />
        <Label Text="Go" BackgroundColor="Green" Font="20" />
    </StackLayout>
</ContentPage>

效果

1

指定方向

Orientation:擺放方向

//垂直（從上到下）
Vertical = 0,
//水平（從左往右）
Horizontal = 1

VerticalOptions:垂直（上下）方向的選項(xiàng)
HorizontalOptions:水平（左右）方向的選項(xiàng)

Start
Center
End
Fill
StartAndExpand
CenterAndExpand
EndAndExpand
FillAndExpand

設(shè)置方向示例

//內(nèi)容
Content = new StackLayout
{
    //間距
    Spacing = 10,
    //垂直方向上，從底部出發(fā)
    VerticalOptions = LayoutOptions.End,
    //堆放三個(gè)Label的方向是水平
    Orientation = StackOrientation.Horizontal,
    //水平方向上，從開始（左邊）出發(fā)
    HorizontalOptions = LayoutOptions.Start,
    Children = { red, yellow, green }
};

效果

2

示例代碼

https://github.com/zLulus/NotePractice/tree/dev3/Xamarin.Forms/XamarinDemo/XamarinDemo/XamarinDemo/DemoPages 的StackLayoutExample

Children

StackLayout的Children定義是

// 摘要:
//     Gets an IList<View> of child element of the Layout.
public IList<T> Children { get; }

所以Children可以裝下View的集合，不止是Label，也可以是ListView等等

示例

var listView = new Xamarin.Forms.ListView
{
    RowHeight = 40
};
listView.ItemsSource = new string[]
{
    "Buy pears",
    "Buy oranges",
    "Buy mangos",
    "Buy apples",
    "Buy bananas"
};
Content = new StackLayout
{
    VerticalOptions = LayoutOptions.FillAndExpand,
    Children = { listView }
};

示例代碼

https://github.com/zLulus/NotePractice/tree/dev3/Xamarin.Forms/XamarinDemo/XamarinDemo/XamarinDemo/DemoPages 的StackLayoutExample 的ListViewInStackLayout

Tips

同時(shí)設(shè)置xaml和cs代碼,哪個(gè)在后面，以哪個(gè)為準(zhǔn)，相當(dāng)于被覆蓋了