所以我有以下代码为我的 TableView
动态创建 ViewCells:
XAML:
<StackLayout>
<TableView Intent="Settings">
<TableView.Root>
<TableSection x:Name="tableSection"></TableSection>
</TableView.Root>
</TableView>
</StackLayout>
C#:
categories = getCategories();
foreach (var category in categories)
{
var viewCell = new ViewCell
{
View = new StackLayout()
{
Padding = new Thickness(20, 0, 20, 0),
HorizontalOptions = LayoutOptions.FillAndExpand,
Children = {
new StackLayout() {
Orientation = StackOrientation.Horizontal,
VerticalOptions = LayoutOptions.CenterAndExpand,
Children = {
new StackLayout() {
HorizontalOptions = LayoutOptions.StartAndExpand,
Children = {
new Label { Text = category.Name}
},
new StackLayout() {
HorizontalOptions = LayoutOptions.EndAndExpand,
Orientation = StackOrientation.Horizontal,
Children = {
new Label { Text = category.Count},
new Image { Source = "right1.png",
IsVisible = category.Selected }
}
}
}
}
}
}
};
viewCell.Tapped += (sender, e) =>
{
if (category.Selected == false)
{
App.DB.UpdateSelected(true);
}
else
{
App.DB.UpdateSelected(false);
}
categories = getCategories();
totalPhraseCount = getTotalPhraseCount();
Title = totalPhraseCount.ToString() + " phrases";
};
tableSection.Add(viewCell);
}
我想做的是,每当我点击一个 View 单元格来更新所选属性时, TableView 中的数据也会更新。在 ListView 中,我可以调用 ItemSelected 事件并使用更新的类别再次调用 ItemSource。这可以用 TableView 实现吗?
最佳答案
试试这个:
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:local="clr-namespace:App54"
x:Class="App54.MainPage">
<ContentPage.Content>
<TableView Intent="Settings">
<TableRoot>
<TableSection x:Name="tableSection" Title="Section Title">
</TableSection>
</TableRoot>
</TableView>
</ContentPage.Content>
</ContentPage>
主页:
public partial class MainPage : ContentPage
{
MyViewModel vm;
public MainPage()
{
InitializeComponent();
vm = new MyViewModel();
foreach (MyDataModel dm in vm.Data)
{
Image img = new Image();
img.SetBinding(Image.SourceProperty, "MyImage", BindingMode.TwoWay, null, null);
img.BindingContext = dm;
Label label1 = new Label();
label1.SetBinding(Label.TextProperty, "MyLabel", BindingMode.TwoWay, null, null);
label1.BindingContext = dm;
Label label2 = new Label();
label2.SetBinding(Label.TextProperty, "Selected", BindingMode.TwoWay, null, null);
label2.BindingContext = dm;
StackLayout sl = new StackLayout();
sl.Orientation = StackOrientation.Horizontal;
sl.Children.Add(img);
sl.Children.Add(label1);
sl.Children.Add(label2);
ViewCell vc = new ViewCell();
vc.BindingContext = dm;
vc.View = sl;
vc.Tapped += Vc_Tapped;
tableSection.Add(vc);
}
}
private void Vc_Tapped(object sender, EventArgs e)
{
ViewCell vc = (ViewCell)sender;
MyDataModel dm = (MyDataModel)vc.BindingContext;
MyDataModel currSel = vm.Data.FirstOrDefault(d => d.Selected == true);
if (currSel != null)
currSel.Selected = false;
dm.Selected = true;
}
}
View 模型:
public class MyViewModel
{
public ObservableCollection<MyDataModel> Data { get; set; }
public MyViewModel()
{
Data = new ObservableCollection<MyDataModel>
{
new MyDataModel {MyLabel = "Label 1", MyImage = "image.png", Selected = false },
new MyDataModel {MyLabel = "Label 2", MyImage = "image.png", Selected = false },
new MyDataModel {MyLabel = "Label 3", MyImage = "image.png", Selected = false },
new MyDataModel {MyLabel = "Label 4", MyImage = "image.png", Selected = false },
new MyDataModel {MyLabel = "Label 5", MyImage = "image.png", Selected = false }
};
}
}
型号:
public class MyDataModel : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged = delegate { };
private string myLabel;
public string MyLabel
{
get { return myLabel; }
set
{
if (value != myLabel)
{
myLabel = value;
PropertyChanged(this, new PropertyChangedEventArgs("MyLabel"));
}
}
}
private string myImage;
public string MyImage
{
get { return myImage; }
set
{
if (value != myImage)
{
myImage = value;
PropertyChanged(this, new PropertyChangedEventArgs("MyImage"));
}
}
}
private bool selected;
public bool Selected
{
get { return selected; }
set
{
if (value != selected)
{
selected = value;
PropertyChanged(this, new PropertyChangedEventArgs("Selected"));
}
}
}
}
关于c# - 如何在 Xamarin Forms 中点击 ViewCell 后刷新 TableView 数据?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/41277186/