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 IListof child element of the Layout.public IListChildren { 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