动态移动Xamarin.Forms条目 [英] Dynamically Move Entry Xamarin.Forms
本文介绍了动态移动Xamarin.Forms条目的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
在我的一个项目的屏幕底部，我有一个输入字段.但是，在iOS上，当您单击输入字段时，键盘会显示在输入字段上方，并且使视野模糊.因此，人们看不到他们在打字.
I have an entry field at the bottom of the screen in one of my projects. However, on iOS, when you click the entry field, the keyboard is displayed over top the entry field and obscures the vision of it. Therefore, people can't see what they're typing.
我该如何解决这个问题?有没有一种方法可以移动输入字段，使其在聚焦时显示在键盘上方?
How can I solve this problem? Is there a way that I can move the entry field so it is displayed above the keyboard when in focus?
//NOTE: the entry field that needs to be moved is userEntry
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection.Emit;
using System.Text;
using CloudClubv1._2_;
using Backend;
using Xamarin.Forms;
using System.Collections.ObjectModel;
namespace FrontEnd
{
public class ClubChatPage : ContentPage
{
public static ObservableCollection<FrontComment> CurrentCommentsList;
ObservableCollection<FrontComment> commentsList;
ColorHandler ch;
Entry userEntry;
ParentFrontClub club;
bool isMember;
Image bBack, bSettings;
public static ListView listView;
TapGestureRecognizer settingsTgr, backButtonTgr;
public ClubChatPage(ParentFrontClub club, List<DBItem> chatList, List<Account> commentUsers, List<Account> requestUsersList, bool isMember)
{
this.isMember = isMember;
settingsTgr = new TapGestureRecognizer();
settingsTgr.Tapped += SettingsTgr_Tapped;
backButtonTgr = new TapGestureRecognizer();
backButtonTgr.Tapped += BackButtonTgr_Tapped;
this.club = club;
ch = new ColorHandler();
this.BackgroundColor = Color.Black;
this.Title = club.Title;
NavigationPage.SetHasNavigationBar(this, false);
this.commentsList = new ObservableCollection<FrontComment>();
int clubRequestCount = 0;
System.Diagnostics.Debug.WriteLine(chatList.Count.ToString());
chatList.Reverse();
for (int i = 0; i < chatList.Count; i++)
{
if (chatList[i].GetType() == typeof(Comment))
{
if (commentUsers[i] != null)
{
this.commentsList.Add(new FrontComment((Comment)chatList[i], commentUsers[i - clubRequestCount]));
}
}
else if (chatList[i].GetType() == typeof(ClubRequest))
{
this.commentsList.Add(new FrontComment((ClubRequest)chatList[i], requestUsersList[clubRequestCount], this.isMember));
clubRequestCount++;
}
}
CurrentCommentsList = this.commentsList;
updatePage();
}
private void updatePage()
{
bBack = new Image
{
Source = FileImageSource.FromFile("arrow_back.png"),
WidthRequest=30,
// Scale = ,
HorizontalOptions = LayoutOptions.StartAndExpand,
VerticalOptions = LayoutOptions.Center,
HeightRequest = 30,
Aspect = Aspect.AspectFill
};
bBack.GestureRecognizers.Add(backButtonTgr);
var actionBarLabel = new Label
{
Text = this.club.Title,
HorizontalOptions = LayoutOptions.CenterAndExpand,
VerticalOptions = LayoutOptions.Center,
TextColor = ch.fromStringToColor("white"),
FontSize = 22,
FontAttributes = FontAttributes.Bold
};
bSettings = new Image
{
Source = ImageSource.FromFile("settings.png"),
Scale = .8,
HorizontalOptions = LayoutOptions.EndAndExpand,
VerticalOptions = LayoutOptions.Center
};
bSettings.GestureRecognizers.Add(settingsTgr);
var actionBarLayout = new StackLayout
{
Children =
{
bBack,
actionBarLabel,
bSettings
},
HeightRequest= 30,
Orientation = StackOrientation.Horizontal,
BackgroundColor = ch.fromStringToColor(this.club.clubColor),
VerticalOptions = LayoutOptions.Center,
Padding = new Thickness(10,10,0,10)
};
listView = new ListView
{
ItemsSource = CurrentCommentsList,
ItemTemplate = new DataTemplate(typeof(CommentViewCell)),
HasUnevenRows = true,
SeparatorVisibility = SeparatorVisibility.None,
SeparatorColor = ch.fromStringToColor("white"),
BackgroundColor = ch.fromStringToColor("white")
};
if (CurrentCommentsList.Count != 0) {
listView.ScrollTo (CurrentCommentsList [CurrentCommentsList.Count () - 1], ScrollToPosition.End, false);
}
listView.ItemTapped += ListView_ItemTapped;
MessagingCenter.Subscribe<CommentViewCell, FrontComment>(this, "hi", async (sender, args) =>
{
var comment = (FrontComment)args;
var answer = await DisplayAlert("Report User", "Do you really want to report " + comment.AuthorUsername + "?", "Yes", "No");
if (answer)
{
await App.dbWrapper.CreateBan(comment.AuthorId, comment.Id, App.dbWrapper.GetUser().Id);
comment.ShowReport = false;
comment.UpdateProperty("ShowReport");
}
else
{
}
//updatePage();
});
userEntry = new Entry
{
BackgroundColor = ch.fromStringToColor("white"),
TextColor = ch.fromStringToColor("black"),
VerticalOptions = LayoutOptions.End,
IsEnabled = isMember,
Placeholder = "Tap to chat"
};
userEntry.Completed += UserEntry_Completed;
userEntry.Focused += UserEntry_Focused;
Label lEmptyChat = new Label
{
Text = "There are no messages. Type below!",
FontSize = 38,
TextColor = ch.fromStringToColor("black"),
XAlign = TextAlignment.Center,
YAlign = TextAlignment.Center,
VerticalOptions = LayoutOptions.FillAndExpand
};
if (CurrentCommentsList.Count != 0)
{
Content = new StackLayout
{
Children =
{
actionBarLayout,
listView,
userEntry
},
BackgroundColor = ch.fromStringToColor("lightGray"),
HorizontalOptions = LayoutOptions.FillAndExpand,
VerticalOptions = LayoutOptions.FillAndExpand
};
}
else
{
Content = new StackLayout
{
Children =
{
actionBarLayout,
lEmptyChat,
userEntry
},
BackgroundColor = ch.fromStringToColor("lightGray"),
HorizontalOptions = LayoutOptions.FillAndExpand,
VerticalOptions = LayoutOptions.FillAndExpand
};
}
}
private void UserEntry_Focused(object sender, FocusEventArgs e)
{
}
private void ListView_ItemTapped(object sender, ItemTappedEventArgs e)
{
var item = (FrontComment)e.Item;
for(int i = 0; i < CurrentCommentsList.Count; i++)
{
if (CurrentCommentsList[i].ShowReport==true)
{
CurrentCommentsList[i].ShowReport = false;
CurrentCommentsList[i].UpdateProperty("ShowReport");
}
}
for (int i = 0; i < CurrentCommentsList.Count; i++)
{
if (CurrentCommentsList[i].Id == item.Id && CurrentCommentsList[i].ClubRequestBool == false)
{
CurrentCommentsList[i].ShowReport = true;
CurrentCommentsList[i].UpdateProperty("ShowReport");
}
}
// updatePage();
}
private async void UserEntry_Completed(object sender, EventArgs e)
{
if (userEntry.Text != "")
{
// var joinClub = await App.dbWrapper.JoinClub(club.Id);
var commentOutput = await App.dbWrapper.CreateComment(userEntry.Text, club.Id);
//System.Diagnostics.Debug.WriteLine("OUTPUT: "+joinClub);
userEntry.Text = "";
listView.ScrollTo(CurrentCommentsList[CurrentCommentsList.Count() - 1], ScrollToPosition.End, false);
// updatePage();
}
}
private async void BackButtonTgr_Tapped(object sender, EventArgs e)
{
await App.dbWrapper.RemoveCurrentClubId();
var btn = sender as Image;
btn.IsEnabled = false;
await Navigation.PopAsync();
btn.IsEnabled = true;
}
private async void SettingsTgr_Tapped(object sender, EventArgs e)
{
//var btn = sender as TapGestureRecognizer;
//btn.Tapped -= SettingsTgr_Tapped;
// bSettings.GestureRecognizers.Remove(settingsTgr);
var tagsList = await App.dbWrapper.GetTags(club.Id);
var usersList = await App.dbWrapper.GetClubMembers(club.Id);
var frontClubMemberList = new List<FrontClubMember>();
var isMember = await App.dbWrapper.IsMember(club.Id);
var founderAccount = await App.dbWrapper.GetAccount(club.founderId);
var prevRating = await App.dbWrapper.GetUserRating(club.Id);
var myFriendRequests = await App.dbWrapper.GetFriendRequests();
for (int i = 0; i < usersList.Count; i++)
{
var storedFriendship = await App.dbWrapper.GetFriendship(usersList[i].Id);
if(storedFriendship == 1) //Indicates request was sent from either user
{
// var accReq = App.dbWrapper.GetAccountFriendRequests(usersList[i].Id);
storedFriendship = 3;
var accReq = new List<FriendRequest>();
for (int j = 0; j < myFriendRequests.Count; j++)
{
if (myFriendRequests[j].AuthorId == usersList[i].Id)
{
storedFriendship = 1;//indicates request was sent by other acc
}
}
}
if (usersList[i].Id == App.dbWrapper.GetUser().Id) storedFriendship= 4;
frontClubMemberList.Add(new FrontClubMember(usersList[i], storedFriendship));
}
var btn = sender as Image;
btn.GestureRecognizers.Remove(settingsTgr);
btn.InputTransparent = true;
await Navigation.PushAsync(new ChatInfoPage(tagsList, club, frontClubMemberList, isMember, founderAccount.Username, prevRating));
btn.GestureRecognizers.Add(settingsTgr);
btn.InputTransparent = false;
}
//used by backend push notifications to scroll to new comments
public static void ScrollToCurrent(){
listView.ScrollTo(CurrentCommentsList[CurrentCommentsList.Count() - 1], ScrollToPosition.End, false);
}
}
}
推荐答案
只需将内容包装在ScrollView中-这将允许在出现Keyboard时移动Entry字段.
Simply wrap the content in a ScrollView - this will allow the Entry fields to be moved when the Keyboard appears.
这篇关于动态移动Xamarin.Forms条目的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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