堆栈式地放置内容
可以在xaml中完成视图,也可以在cs代码中完成视图
Xamarin的所有视图和布局都是可以
1.在xaml中完成
2.在cs代码中完成视图
(类比WPF)
示例
在cs代码中完成视图
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
};
//内容
Content = new StackLayout
{
//间距
Spacing = 10,
Children = { red, yellow, green }
};
在xaml中完成视图
这里注意默认生成的是Page,不是ContentPage,要手动修改,不然无效
<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
指定方向
Orientation:摆放方向
//垂直(从上到下)
Vertical = 0,
//水平(从左往右)
Horizontal = 1
VerticalOptions:垂直(上下)方向的选项
HorizontalOptions:水平(左右)方向的选项
Start
Center
End
Fill
StartAndExpand
CenterAndExpand
EndAndExpand
FillAndExpand
设置方向示例
//内容
Content = new StackLayout
{
//间距
Spacing = 10,
//垂直方向上,从底部出发
VerticalOptions = LayoutOptions.End,
//堆放三个Label的方向是水平
Orientation = StackOrientation.Horizontal,
//水平方向上,从开始(左边)出发
HorizontalOptions = LayoutOptions.Start,
Children = { red, yellow, green }
};
效果
示例代码
https://github.com/zLulus/NotePractice/tree/dev3/Xamarin.Forms/XamarinDemo/XamarinDemo/XamarinDemo/DemoPages 的StackLayoutExample
Children
StackLayout的Children定义是
// 摘要:
// Gets an IList<View> of child element of the Layout.
public IList<T> Children { get; }
所以Children可以装下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 }
};
示例代码
https://github.com/zLulus/NotePractice/tree/dev3/Xamarin.Forms/XamarinDemo/XamarinDemo/XamarinDemo/DemoPages 的StackLayoutExample 的ListViewInStackLayout
Tips
同时设置xaml和cs代码,哪个在后面,以哪个为准,相当于被覆盖了