如何解决我的启动画面不起作用xamarin形式
我想添加一个初始屏幕(我跟随此视频https://www.youtube.com/watch?v=y8ce7OyAgYU&feature=share&fbclid=IwAR0OAz-YUEjnppifXQ4cS85pZPmbxddnuY-Y9gjQw6u5ObRMmUtanDX_h10),但它不起作用
using System;
using System.Collections.Generic;
using System.Text;
using Xamarin.Forms;
namespace NotesDesFrais
{
public class SplashPage : ContentPage
{
Image splashImage;
public SplashPage()
{
NavigationPage.SetHasNavigationBar(this,false);
var sub = new AbsoluteLayout();
splashImage = new Image
{
Source = "interrogation.jpg",WidthRequest = 100,HeightRequest = 100
};
AbsoluteLayout.SetLayoutFlags(splashImage,AbsoluteLayoutFlags.PositionProportional);
AbsoluteLayout.SetLayoutBounds(splashImage,new Rectangle(0.5,0.5,AbsoluteLayout.AutoSize,AbsoluteLayout.AutoSize));
sub.Children.Add(splashImage);
this.BackgroundColor = Color.FromHex("#429de3");
this.Content = sub;
}
protected override async void OnAppearing()
{
base.OnAppearing();
await splashImage.ScaleTo(1,2000); //Time-consuming processes such as initialization
await splashImage.ScaleTo(0.9,1500,Easing.Linear);
await splashImage.ScaleTo(150,1200,Easing.Linear);
Application.Current.MainPage = new NavigationPage(new MainPage()); //After loading MainPage it gets Navigated to our new Page
}
}
}
App.xaml.cs
public partial class App : Application
{
public App()
{
InitializeComponent();
XF.Material.Forms.Material.Init(this);
MainPage = new NavigationPage(new SplashPage());
}
解决方法
您是否在Andriod(资源> Drawable)和iOS资源(xAssets)中添加了资源interrogation.jpg?
您还从App.cs调用了SplashPage吗?如下:
MainPage = new NavigationPage(new SplashPage());
您要完成的是在主应用程序启动之前创建一个内容页面。它可能会达到您的目的,但请注意,这不是真正的启动画面。启动应用程序时,应尽快显示初始屏幕,但Xamarin.Forms直到启动序列的后期才初始化,这意味着初始屏幕必须在每个平台上的Xamarin.Forms外部实现。 >
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