Question

我想知道如何从xamarin表单中的命令调用函数。我目前正在使用https://github.com/robinmanuelthiel/swipecards来设置一叠可刷卡的卡片。我能够看到在元文件中有两个可绑定的属性来处理左右滑动。

从Meta文件中剪切：

public static BindableProperty SwipedRightCommandProperty;
public static BindableProperty SwipedLeftCommandProperty;

public Action<object> SwipedRight;
public Action<object> SwipedLeft;

public ICommand SwipedRightCommand { get; set; }
public ICommand SwipedLeftCommand { get; set; }

我能够在我的XAML内容页面中绑定ItemSource，但我似乎无法绑定到向左滑动并向右滑动命令。

XAML：

<swipecards:CardStackView
            x:Name="CardStackView"
            ItemsSource="{Binding MyList}"
            SwipedLeftCommand="{Binding SwipedLeft}"
            SwipedRightCommand="{Binding SwipedRight}"
            CardMoveDistance="60"
            Grid.Column="0" Grid.ColumnSpan="3"
            Grid.Row="0">

C＃（在我的视图模型中）

public void SwipedLeft(object obj)
{
    System.Diagnostics.Debug.WriteLine("Something Happened");
}

public void SwipedRight(object obj)
{
    System.Diagnostics.Debug.WriteLine("Something Happened");
}

任何人都知道如何正确绑定命令，以便正确触发我的功能？

Answer 1

绑定命令到经典Xamarin Button控件如下所示：

XAML：

<Button Command="{Binding SwipeLeftCommand}" CommandParameter="{Binding SwipeLeftCommandParam}" />

视图模型：

public ICommand SwipedRightCommand { get; } //getter is sufficient


public YourViewModel()
{
    //plain code (often comes with bad maintainability)
    SwipeLeftCommand = new Command(() => { /* code */ });

    //simple method attachment (with command parameter)
    SwipeLeftCommand = new Command((commandParameter) => SwipedLeft(commandParameter));

    //simple method + async/await call
    SwipeLeftCommand = new Command(async (commandParameter) => await SwipedLeft(commandParameter));
}

如何在xamarin表单中调用Binding Command中的函数

1 个答案: