停止Xamarin.Forms中的IOS弹跳

Question

Im making an application in Xamarin.Form and i am new in Xamarin. In IOS the application bounce when scroll in the top. Is there anyway to stop the scroll bouncing?

I try running a CSS file and did not work.

Answer 1

There is a dedicated property for this on iOS. This is AlwaysBounceVertical . There are also a few related properties to this.

Setting these properties isn't supported directly in Forms though, so you need to create a custom renderer or equal. Have a look at this one:

using NoBounceiOS.iOS;
using Xamarin.Forms;
using Xamarin.Forms.Platform.iOS;

[assembly: ExportRenderer(typeof(ListView), typeof(NoBounceRenderer))]
namespace NoBounceiOS.iOS
{
    public class NoBounceRenderer : ListViewRenderer
    {
        protected override void OnElementChanged(ElementChangedEventArgs<ListView> e)
        {
            base.OnElementChanged(e);

            if (Control != null)
            {
                Control.AlwaysBounceVertical = false;
            }
        }
    }
}

Answer 2

Cause: in Xamarin.forms for iOS there are some property of UITableView(listview in forms).

@property(nonatomic)  BOOL  bounces;                  // default YES. if YES, bounces past edge of content and back again

@property(nonatomic)  BOOL  alwaysBounceVertical;     // default NO. if YES and bounces is YES, even if content is smaller than bounds, allow drag vertically

@property(nonatomic)  BOOL  alwaysBounceHorizontal;   // default NO. if YES and bounces is YES, even if content is smaller than bounds, allow drag horizontally

So ,only set AlwaysBounceVertical as false will not work.You should set the bounces as false.

Solution: As @Gerald Versluis said you can use CustomRenderer.

public class MyListViewRenderer:ListViewRenderer
{
    public MyListViewRenderer()
    {

    }

    protected override void OnElementChanged(ElementChangedEventArgs<ListView> e)
    {
        base.OnElementChanged(e);

        if(Control!=null)
        {
            Control.Bounces = false;
        }


    }
}