[英]Implement Prism in existing Xamarin.Forms Shared Application
我想知道在现有的Xamarin.Forms共享项目中有一种有效的方法来实现Prism。 我相信其他人也想知道他们是否可以从Prism提供的产品中获利,而无需将他们现有的项目转换为PCL项目。 我发现的所有现有示例都显示了一个PCL项目(可能是有充分理由的)。
为了在我的项目中尝试实现Prism,我将Prims.Unity.Forms nuget安装到每个平台项目中。 我试图从PrismApplication继承:
public partial class App : PrismApplication
{ }
但是,这不起作用。 app类不允许我从不同的基类继承。
将以下行添加到我的android项目没有帮助:
protected override void OnCreate(Bundle bundle)
{
LoadApplication(new App(new AndroidInitializer()));
}
public class AndroidInitializer : IPlatformInitializer
{
public void RegisterTypes(IUnityContainer container)
{ }
}
也许我错过了一些东西或尝试在结构上不可能的东西。
是的,这是完全可能的。
例如,对于Prism和Unity,您需要:
<package id="Prism.Core" version="6.3.0" ... />
<package id="Prism.Forms" version="6.3.0" .../>
<package id="Prism.Unity.Forms" version="6.3.0" ... />
<package id="Unity" version="4.0.1" ... />
并将您现有的页面移动到
Views
文件夹, 但记得调整命名空间或绑定不起作用。
请记住在代码和XAML中更改应用程序基类型。
using Prism.Unity;
using Xamarin.Forms;
namespace XamPrismShared
{
public partial class App : PrismApplication
{
public App (IPlatformInitializer platformInitializer):base(platformInitializer)
{
}
}
}
实现OnInitialized和RegisterTypes。 请记住,您需要将要使用Prism的每种类型注册为页面。
using Prism.Unity;
using Xamarin.Forms;
namespace XamPrismShared
{
public partial class App : PrismApplication
{
public App (IPlatformInitializer platformInitializer):base(platformInitializer)
{
}
protected override void OnInitialized()
{
InitializeComponent();
NavigationService.NavigateAsync("MainPage");
}
protected override void RegisterTypes()
{
Container.RegisterTypeForNavigation<NavigationPage>();
Container.RegisterTypeForNavigation<MainPage>();
}
}
}
将ViewModelLocator.AutowireViewModel="True"
添加到现有视图中,以允许Prism 自动与其各自的ViewModel 绑定 。
<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:prism="clr-namespace:Prism.Mvvm;assembly=Prism.Forms"
prism:ViewModelLocator.AutowireViewModel="True" x:Class="x:Class="XamPrismShared.Views.MainPage"" Title="MainPage">
<Label Text="{Binding Title}"
VerticalOptions="Center"
HorizontalOptions="Center" />
</ContentPage>
using Prism.Mvvm;
namespace XamPrismShared.ViewModels
{
public class MainPageViewModel : BindableBase
{
public MainPageViewModel()
{
Title = "Hi from Prism.";
}
public string Title { get; set; }
}
}
添加缺少的平台初始化程序并修复Xamarin.Forms加载。
对于Android,
using Android.App; using Android.Content.PM; using Android.OS; using Microsoft.Practices.Unity; using Prism.Unity; namespace XamPrismShared.Droid { [Activity (Label = "XamPrismShared", Icon = "@drawable/icon", Theme="@style/MainTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)] public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity { protected override void OnCreate (Bundle bundle) { TabLayoutResource = Resource.Layout.Tabbar; ToolbarResource = Resource.Layout.Toolbar; base.OnCreate (bundle); global::Xamarin.Forms.Forms.Init (this, bundle); LoadApplication (new XamPrismShared.App(new AndroidPlatformInitializer())); } } public class AndroidPlatformInitializer : IPlatformInitializer { public void RegisterTypes(IUnityContainer container) { } } }
对于iOS,
using Foundation; using Microsoft.Practices.Unity; using Prism.Unity; using UIKit; namespace XamPrismShared.iOS { [Register("AppDelegate")] public partial class AppDelegate : global::Xamarin.Forms.Platform.iOS.FormsApplicationDelegate { public override bool FinishedLaunching(UIApplication app, NSDictionary options) { global::Xamarin.Forms.Forms.Init (); LoadApplication (new XamPrismShared.App(new iOSPlatformInitializer())); return base.FinishedLaunching (app, options); } } public class iOSPlatformInitializer : IPlatformInitializer { public void RegisterTypes(IUnityContainer container) { } } }
如果您有任何疑问或想要查看,可以查看Github中的代码https://github.com/jesulink2514/Xamarin-Prism-shared-project
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