android - 在 Xamarin 表单中动态创建页面

Question

我在云端有一个这样的文本文件

<Entry Placeholder ="FirstName" />
<Entry Placeholder ="Last Name" />

我想加载这个文件并在运行时将这些代码注入(inject)到 Xamarin Form 的内容页面中

Answer 1

如果您的 xml 文件不复杂并且您不想使用 Nuget 包。您自己的实现应该相当简单。

假设你在云端的xml文件结构是这样的:

<?xml version="1.0" encoding="utf-8" ?>
<Form>
    <Entry Placeholder ="First Name" />
    <Entry Placeholder ="Last Name" />
</Form>

您的动态页面模板 (YourForm.Xaml):

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="Company.Project.Feature.Views.YourForm">
             <StackLayout Spacing="6" x:Name="EntryFieldsStack">
                <!--Currently this is empty. Children are added in the code behing after loading the xml file from the cloud-->
             </StackLayout>
</ContentPage> 

在后面的代码中:

namespace Company.Project.Feature.Views
{
    public partial class YourForm:ContentPage
    {
        InitializeComponent();
        LoadDynamicFields();
    }
    public void LoadDynamicFields()
    {
        //load the file as an XDocument from the url
        var doc = System.Xml.Linq.XDocument.Load("http://example.com/xml-file-url");
        foreach (var entry in doc.Descendants("Entry")
                .Select(e => new Entry {Placeholder = e.Attribute("PlaceHolder")?.Value}))
        {
            EntryFieldsStack.Children.Add(entry);
        }

    }
}