I want to implement pull to refresh on a Forms project I have, but after the refresh is over, the Cells in the ListView are empty on iOS. this is what I got
<ListView x:Name="listView" Grid.Row="2" Grid.Column="0" ItemsSource="ActivityList" BackgroundColor="#D6D6D6" IsVisible="False"> <ListView.ItemTemplate> <DataTemplate> <ViewCell> <ViewCell.View> <custom:CustomFrame Padding="0,5,0,0" Margin="0,10,0,0" > <StackLayout> <Label Style="{StaticResource bold}" FontSize="Large" TextColor="#c4950b" Margin="10,0,0,0" x:Name="labelName" Text="{Binding Key}" /> <local1:Carousel ActList="{Binding Value}" KeyName="{Binding Key}" /> </StackLayout> </custom:CustomFrame> </ViewCell.View> </ViewCell> </DataTemplate> </ListView.ItemTemplate> </ListView>
ListView CustomRenderer
`
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using BizPass.iOS;
using Foundation;
using UIKit;
using Xamarin.Forms;
using Xamarin.Forms.Platform.iOS;
[assembly: ExportRenderer(typeof(ListView), typeof(NoBarListView))]
namespace BizPass.iOS
{
class NoBarListView : ListViewRenderer
{
protected override void OnElementChanged(ElementChangedEventArgs e)
{
base.OnElementChanged(e);
if (Control != null)
{
var itemCount = Control.NumberOfRowsInSection(0);
System.Diagnostics.Debug.WriteLine(itemCount);
Control.ShowsHorizontalScrollIndicator = false;
Control.ShowsVerticalScrollIndicator = false;
}
}
}
}
`
Frame CustomRenderer
`
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using BizPass.iOS;
using CoreGraphics;
using Foundation;
using UIKit;
using Xamarin.Forms;
using Xamarin.Forms.Platform.iOS;
[assembly: ExportRenderer(typeof(BizPass.Controls.CustomFrame), typeof(CustomFrame))]
namespace BizPass.iOS
{
class CustomFrame : FrameRenderer
{
protected override void OnElementChanged(ElementChangedEventArgs e)
{
base.OnElementChanged(e);
if(e.OldElement != null)
{
var rect = e.OldElement.Bounds.ToRectangleF();
this.Draw(rect);
}
//Forces the element to be redrawn when coming into veiw. Specifically for upcoming list
ContentMode = UIViewContentMode.Redraw;
}
//Method to draw the control
public override void Draw(CGRect rect)
{
// Update shadow to match better material design standards of elevation
Layer.ShadowRadius = 2.0f;
Layer.ShadowColor = UIColor.LightGray.CGColor;
Layer.ShadowOffset = new CGSize(2, 2);
Layer.ShadowOpacity = 0.80f;
Layer.ShadowPath = UIBezierPath.FromRect(Layer.Bounds).CGPath;
Layer.MasksToBounds = false;
base.Draw(rect);
}
}
}
`
