动态移动条目Xamarin.Forms

在我的一个项目中，我在屏幕底部有一个输入字段。 但是，在iOS上，当您单击输入字段时，键盘将显示在输入字段的顶部，并遮盖其视野。 因此，人们无法看到他们正在打字的内容。

我怎么解决这个问题？ 有没有办法可以移动输入字段，使其在焦点上显示在键盘上方？

//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 CurrentCommentsList; ObservableCollection commentsList; ColorHandler ch; Entry userEntry; ParentFrontClub club; bool isMember; Image bBack, bSettings; public static ListView listView; TapGestureRecognizer settingsTgr, backButtonTgr; public ClubChatPage(ParentFrontClub club, List chatList, List commentUsers, List 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(); 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(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(); 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(); 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); } } } 

Answer 1

只需将内容包装在ScrollView中 – 这将允许在键盘出现时移动Entry字段。