LoginView in Xamarin.Form

Question

我正在尝试使用xamarin.form实现一个loginview。我已经在我的项目中实现了以下代码，但是，一旦我运行，它就不会在视图上显示任何内容。

using System;
using System.Collections.Generic;
using Xamarin.Forms;

namespace WebComponents
{   
    public partial class LoginView : ContentPage
    {   
        public LoginView ()
        {
            InitializeComponent ();


            var profilePage = new ContentPage {
                Title = "Profile",
                Content = new StackLayout {
                    Spacing = 20,
                    Padding = 50,
                    VerticalOptions = LayoutOptions.Center,
                    Children = {
                        new Entry { Placeholder = "Username" },
                        new Entry { Placeholder = "Password", IsPassword = true },
                        new Button { Text = "Login", TextColor = Color.White, BackgroundColor = Color.FromHex("77D065") }
                    }
                }
            };
        }
    }
}

Answer 1

LoginView是ContentPage的一个子类--您正在创建另一个ContentPage，profilePage，但没有使用它做任何事情。试一试：

   Entry username;
   Entry password;
   Button button;

   public LoginView ()
   {
        InitializeComponent ();

        Title = "Profile";

        Content = new StackLayout {
                Spacing = 20,
                Padding = 50,
                VerticalOptions = LayoutOptions.Center,
                Children = {
                    (username = new Entry { Placeholder = "Username" }),
                    (password = new Entry { Placeholder = "Password", IsPassword = true }),
                    (button = new Button { Text = "Login", TextColor = Color.White, BackgroundColor = Color.FromHex("77D065") })
                }
            }
        };

        button.Clicked += Login;
    }

    public void Login(object sender, EventArgs ea) 
    {
        // check values of username and password here
    }