如何获取gridview的选定元素索引？

Question

在这里，我正在创建一个动态网格视图。

    private void PopulateImages()
            {
                ObservableCollection<Attachment> Images = new ObservableCollection<Attachment>();
                Images.Add(new Attachment { Name = "Image 1", Index = 0 });
                Images.Add(new Attachment { Name = "Image 2", Index = 1 });
                Images.Add(new Attachment { Name = "Image 3", Index = 2 });
                Images.Add(new Attachment { Name = "Image 4", Index = 3 });
                Images.Add(new Attachment { Name = "Image 5", Index = 4 });
                Images.Add(new Attachment { Name = "Image 6", Index = 5 });

                gridLayout.RowDefinitions.Add(new RowDefinition() { Height = new GridLength(1, GridUnitType.Auto) });
                gridLayout.RowDefinitions.Add(new RowDefinition() { Height = new GridLength(1, GridUnitType.Auto) });

                gridLayout.ColumnDefinitions.Add(new ColumnDefinition() { Width = new GridLength(33, GridUnitType.Star) });
                gridLayout.ColumnDefinitions.Add(new ColumnDefinition() { Width = new GridLength(33, GridUnitType.Star) });
                gridLayout.ColumnDefinitions.Add(new ColumnDefinition() { Width = new GridLength(33, GridUnitType.Star) });

                gridLayout.ColumnSpacing = 8;
                gridLayout.RowSpacing = 8;

                var productIndex = 0;
                for (int rowIndex = 0; rowIndex < 2; rowIndex++)
                {
                    for (int columnIndex = 0; columnIndex < 3; columnIndex++)
                    {
                        if (productIndex >= Images.Count)
                        {
                            break;
                        }
                        var product = Images[productIndex];
                        productIndex += 1;

                        var frame = new Frame
                        {
                            HeightRequest = 95,
                            WidthRequest = 70,
                            CornerRadius = 10,
                            HasShadow = false,
                            BorderColor = Color.FromHex("#CCCCCC")
                        };

                        var image = new Image
                        {
                            Source = "addImage.png",
                            VerticalOptions = LayoutOptions.Center,
                            HorizontalOptions = LayoutOptions.Center,
                            HeightRequest = 35,
                            WidthRequest = 35
                        };

                        frame.Content = image;

                        TapGestureRecognizer tapped = new TapGestureRecognizer();

                        tapped.Tapped += (s, e) =>
                        {                        
                            TakePhoto();
                        };

                        frame.GestureRecognizers.Add(tapped);

                        gridLayout.Children.Add(frame, columnIndex, rowIndex);
                    }
                }
            }

当用户点击任何帧时，它会打开相机，捕捉后，图像将被设置为选定的帧。

那么如何获取这个网格的选中帧索引呢？ 另外如何从这个图像视图中找到图像源？

是否有任何插件可用于使用此类功能以 xamarin 形式上传多张图片？

Answer 1

至于我，ClassId 做了一个诡计。

在创建您的Frame 时，请致电：

yourframe.ClassId = yourindex;

然后在您的Tap 事件中获取您的View's ClassId。 类似的东西：

tapGestureRecognizer.Tapped += (s, e) => 
{
    // получим свойства для ячейки, чтобы понять, какое всплыващее окно вызвать
    var specIndex= Convert.ToInt32(((View) s).ClassId);                    
};

Answer 2

您可以使用它来获取所选 Grid 的 Row 属性和 Column 属性：

tapped.Tapped += (s, e) =>
{
   TakePhoto();
   var row = (int)((BindableObject)s).GetValue(Grid.RowProperty);
   var column = (int)((BindableObject)s).GetValue(Grid.ColumnProperty);
};