Xamarin 表单中 StackLayout 上的动态 TapGestureRecognizer

Posted 2023-02-27

【中文标题】Xamarin 表单中 StackLayout 上的动态 TapGestureRecognizer

【英文标题】：Dynamic TapGestureRecognizer on StackLayout in XamarinForms

【发布时间】：2020-06-01 01:50:48

【问题描述】：

我有下面的代码，我基本上是循环一个列表并使用该列表的属性作为值：

SLTData.g_RecentLoans.ForEach(x => 
    colorCode = loanHistoryViewModel.GetStatusColor(x.ActivityListID);
    principal = utilities.FormatCurrency(x.PAMT);
    formattedDate = loanHistoryViewModel.ConvertDate(x.DateRequested);

    stackRecentList.Children.Add(
             new Frame 
                BackgroundColor = Color.White,
                Margin = new Thickness(30, 20, 30, 0),
                Padding = new Thickness(10),
                CornerRadius = 5,
                HasShadow = true,
                Content = new StackLayout 
                    Orientation = StackOrientation.Horizontal,
                    Spacing = 0,
                    Children = 
                        // Content here
                        // The 'x' variables are used inside this StackLayout
                    
                
            
        );
);

问题是，我想在循环中 StackLayout 的每次迭代中添加一个 TapGestureRecognizer。我尝试在 StackLayout 的右括号中添加.GestureRecognizers.Add(tapGestureRecognizer)，但它显示Cannot implicitly convert type 'void' to 'Xamarin.Forms.View'

我基本上想要做的是向处理点击的函数添加一个参数，该参数是传递给 API 的关键字。

【问题讨论】：

那是因为你必须将它应用到 Add 方法，检查括号并将它应用到你的 View ！！！

【参考方案1】：

我想在循环中StackLayout的每次迭代中添加一个TapGestureRecognizer。

也许你在为StackLayout添加tapGestureRecognizer时遇到了一些问题，我提供了一些代码你可以看看：

  private  void loadtap()
    
        for(int i=0;i<5;i++)
        
            Frame f = new Frame()
            
                BackgroundColor = Color.White,
                Margin = new Thickness(30, 20, 30, 0),
                Padding = new Thickness(10),
                CornerRadius = 5,
                HasShadow = true,

            ;

            StackLayout stack = new StackLayout()
            
                Orientation = StackOrientation.Horizontal,
                Spacing = 0,
                Children =  new Label()Text="this is test"

                
            ;

            var tapGestureRecognizer = new TapGestureRecognizer();
            tapGestureRecognizer.Tapped += (s, e) => 
              DisplayAlert("Alert", "You have been click tap", "OK");
            ;

            stack.GestureRecognizers.Add(tapGestureRecognizer);
            f.Content = stack;

            stacklist.Children.Add(f);