[英]Xamarin Forms PushAsync not animating
在登录页面之后,我 PushAsync 一个 MainPage,它有一个 Listview 和一个 CollectionView,现在是模拟的。 我看到的是淡入淡出 animation 的损失(可能)是由于页面的沉重,实际上在过渡中有一点时间滞后。 我不做重手术怎么可能? 我测试了一个只有两个彩色框的空白页面,淡入淡出 animation 过渡效果很好,但在这种情况下不行。 我尝试通过代码使用 Binding 和列表初始化,但结果是一样的。
代码下方:MainPage.cs
using BrScanner.Models;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;
namespace BrScanner
{
[XamlCompilation(XamlCompilationOptions.Compile)]
public partial class MainPage : ContentPage
{
public ObservableCollection<string> OrdersVertical { get; }
public ObservableCollection<ArticleForOrdineOTI> Orders { get;}
public MainPage()
{
InitializeComponent();
OrdersVertical = new ObservableCollection<string>() { "Ordine 1", "Ordine 2", "Ordine 3", "Ordine 1", "Ordine 2", "Ordine 3", "Ordine 1", "Ordine 2", "Ordine 3" };
Orders = new ObservableCollection<ArticleForOrdineOTI>(){
new ArticleForOrdineOTI()
{
Oarti = 22,
Carti = "Carti",
Tarti = "Descrizione Ordine OTI"
},
new ArticleForOrdineOTI()
{
Oarti = 45,
Carti = "Carti",
Tarti = "Descrizione Ordine OTI"
},
new ArticleForOrdineOTI()
{
Oarti = 76,
Carti = "Carti",
Tarti = "Descrizione Ordine OTI"
}
};
ordersList.ItemsSource = OrdersVertical;
horizOrders.ItemsSource = Orders;
//BindingContext = this;
}
private async void New_OrderOTI_Button_Clicked(object sender, EventArgs e)
{
var orderPage = new OrderOTIPage();
await Navigation.PushAsync(new test(), true);
}
}
}
主页.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"
xmlns:d="http://xamarin.com/schemas/2014/forms/design"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:flex="clr-namespace:Flex.Controls;assembly=Flex"
mc:Ignorable="d"
x:Class="BrScanner.MainPage">
<ContentPage.Content>
<AbsoluteLayout>
<Grid x:Name="mainGrid" VerticalOptions="StartAndExpand">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<CollectionView
x:Name="horizOrders"
HeightRequest="250"
MinimumHeightRequest="250"
Grid.Row="0"
ItemsLayout="HorizontalList"
>
<CollectionView.ItemTemplate>
<DataTemplate>
<StackLayout>
<Frame
HasShadow="True"
Margin="5"
Padding="20"
CornerRadius="5"
>
<StackLayout Orientation="Vertical">
<Label Text="{Binding Tarti}" FontSize="Medium"/>
<Label Text="{Binding Oarti}"/>
<Label Text="{Binding Carti}"/>
<Label Text="{Binding Carti}"/>
<Label Text="{Binding Carti}"/>
<Label Text="{Binding Carti}"/>
<Label Text="{Binding Carti}"/>
</StackLayout>
</Frame>
</StackLayout>
</DataTemplate>
</CollectionView.ItemTemplate>
</CollectionView>
<ListView Grid.Row="1" x:Name="ordersList" >
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<StackLayout>
<Label Text="Ordine nr. 26"/>
<Label Text="by Ivan Ardillo"/>
<Label Text="consegnato alle 12:34"/>
</StackLayout>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</Grid>
<flex:FlexButton
Clicked="New_OrderOTI_Button_Clicked"
AbsoluteLayout.LayoutBounds=".9, .99, 80, 80"
AbsoluteLayout.LayoutFlags="PositionProportional"
WidthRequest="76"
HeightRequest="76"
CornerRadius="38"
HorizontalOptions="Center"
Icon="brcode_icon_128px.png"
ForegroundColor="#ffffff"
HighlightForegroundColor="#49516F"
BackgroundColor="#607D8B"
HighlightBackgroundColor="#8EA4D2"/>
</AbsoluteLayout>
</ContentPage.Content>
</ContentPage>
如果你认为卡顿是重UI造成的,你可以尝试在OnAppearing
方法而不是构造方法中加载数据。
public MainPage()
{
InitializeComponent();
}
protected override void OnAppearing()
{
base.OnAppearing();
OrdersVertical = new ObservableCollection<string>() { "Ordine 1", "Ordine 2", "Ordine 3", "Ordine 1", "Ordine 2", "Ordine 3", "Ordine 1", "Ordine 2", "Ordine 3" };
Orders = new ObservableCollection<ArticleForOrdineOTI>(){
new ArticleForOrdineOTI()
{
Oarti = 22,
Carti = "Carti",
Tarti = "Descrizione Ordine OTI"
},
new ArticleForOrdineOTI()
{
Oarti = 45,
Carti = "Carti",
Tarti = "Descrizione Ordine OTI"
},
new ArticleForOrdineOTI()
{
Oarti = 76,
Carti = "Carti",
Tarti = "Descrizione Ordine OTI"
}
};
ordersList.ItemsSource = OrdersVertical;
horizOrders.ItemsSource = Orders;
}
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