C# UIActionSheet.Dispose方法代码示例

        private void ShareButtonPress()
        {
            var sheet = new UIActionSheet();
            var shareButton = sheet.AddButton("Share");
            var showButton = sheet.AddButton("Show in Bitbucket");
            var cancelButton = sheet.AddButton("Cancel");
            sheet.CancelButtonIndex = cancelButton;
            sheet.DismissWithClickedButtonIndex(cancelButton, true);
            sheet.Dismissed += (s, e) => {
                BeginInvokeOnMainThread(() =>
                {
                    if (e.ButtonIndex == showButton)
                        ViewModel.GoToGitHubCommand.Execute(null);
                    else if (e.ButtonIndex == shareButton)
                        ViewModel.ShareCommand.Execute(null);
                });

                sheet.Dispose();
            };

            sheet.ShowFrom(NavigationItem.RightBarButtonItem, true);
        }

        private void ShowExtraMenu(object o, EventArgs args)
        {
            var repoModel = ViewModel.Repository;
            if (repoModel == null)
                return;

            var sheet = new UIActionSheet();
			var pinButton = sheet.AddButton(ViewModel.IsPinned ? "Unpin from Slideout Menu" : "Pin to Slideout Menu");
            var forkButton = sheet.AddButton("Fork Repository");
			var showButton = sheet.AddButton("Show in Bitbucket");
            var cancelButton = sheet.AddButton("Cancel");
            sheet.CancelButtonIndex = cancelButton;
            sheet.DismissWithClickedButtonIndex(cancelButton, true);
            sheet.Dismissed += (s, e) => {
                BeginInvokeOnMainThread(() => {
                // Pin to menu
                if (e.ButtonIndex == pinButton)
                {
                    ViewModel.PinCommand.Execute(null);
                }
                else if (e.ButtonIndex == forkButton)
                {
                    ViewModel.ForkCommand.Execute(null);
                }
                // Show in Bitbucket
                else if (e.ButtonIndex == showButton)
                {
					ViewModel.GoToUrlCommand.Execute(ViewModel.HtmlUrl);
                }
                });

                sheet.Dispose();
            };

            sheet.ShowFrom(NavigationItem.RightBarButtonItem, true);
        }

        private void ShowExtraMenu(UIBarButtonItem item)
        {
            if (ViewModel.Issue == null)
                return;

            var sheet = new UIActionSheet();
            var editButton = ViewModel.IsCollaborator ? sheet.AddButton("Edit") : -1;
            var openButton = ViewModel.IsCollaborator ? sheet.AddButton(ViewModel.Issue.State == "open" ? "Close" : "Open") : -1;
            var commentButton = sheet.AddButton("Comment");
            var shareButton = sheet.AddButton("Share");
            var showButton = sheet.AddButton("Show in GitHub");
            var cancelButton = sheet.AddButton("Cancel");
            sheet.CancelButtonIndex = cancelButton;
            sheet.Dismissed += (s, e) =>
            {
                BeginInvokeOnMainThread(() =>
                {
                    if (e.ButtonIndex == editButton)
                        ViewModel.GoToEditCommand.Execute(null);
                    else if (e.ButtonIndex == openButton)
                        ViewModel.ToggleStateCommand.Execute(null);
                    else if (e.ButtonIndex == shareButton)
                        AlertDialogService.ShareUrl(ViewModel.Issue?.HtmlUrl, NavigationItem.RightBarButtonItem);
                    else if (e.ButtonIndex == showButton)
                        ViewModel.GoToUrlCommand.Execute(ViewModel.Issue.HtmlUrl);
                    else if (e.ButtonIndex == commentButton)
                        AddCommentTapped();
                });

                sheet.Dispose();
            };

            sheet.ShowFrom(item, true);
        }

        void OnActionSheetDismissed(UIActionSheet sheet, int buttonIndex)
        {
            sheet.Dispose ();

            picker = null;

            if (buttonIndex == -1)
                return;

            CancelPhotoTask ();

            switch (buttons[buttonIndex]) {
            case PhotoResponse.ChoosePhoto:
                picker = new AircraftPhotoPickerController ();
                picker.Delegate = new AircraftPhotoPickerDelegate (this);
                picker.SourceType = UIImagePickerControllerSourceType.PhotoLibrary;
                picker.AllowsEditing = true;
                break;
            case PhotoResponse.CapturePhoto:
                picker = new AircraftPhotoPickerController ();
                picker.Delegate = new AircraftPhotoPickerDelegate (this);
                picker.SourceType = UIImagePickerControllerSourceType.Camera;
                picker.CameraDevice = UIImagePickerControllerCameraDevice.Rear;
                picker.CameraCaptureMode = UIImagePickerControllerCameraCaptureMode.Photo;
                picker.CameraFlashMode = UIImagePickerControllerCameraFlashMode.Auto;
                picker.ShowsCameraControls = true;
                picker.AllowsEditing = true;
                break;
            case PhotoResponse.FlightAware:
                FetchPhotograph (true);
                break;
            case PhotoResponse.UnsetPhoto:
                Photograph = null;
                break;
            }

            if (picker != null) {
                popover = new UIPopoverController (picker);
                popover.DidDismiss += OnPopoverDismissed;

                popover.PresentFromRect (PhotoRect, this, UIPopoverArrowDirection.Any, true);
            }
        }

		private void ShowExtraMenu()
		{
			var changeset = ViewModel.Commits;
			if (changeset == null)
				return;

            var sheet = new UIActionSheet();
			var addComment = sheet.AddButton("Add Comment");
			var copySha = sheet.AddButton("Copy Sha");
//			var shareButton = sheet.AddButton("Share");
			//var showButton = sheet.AddButton("Show in GitHub");
			var cancelButton = sheet.AddButton("Cancel");
			sheet.CancelButtonIndex = cancelButton;
			sheet.DismissWithClickedButtonIndex(cancelButton, true);
            sheet.Dismissed += (s, e) => {

                BeginInvokeOnMainThread(() =>
                {
    				// Pin to menu
    				if (e.ButtonIndex == addComment)
    				{
    					AddCommentTapped();
    				}
    				else if (e.ButtonIndex == copySha)
    				{
    					UIPasteboard.General.String = ViewModel.Node;
    				}
    //				else if (e.ButtonIndex == shareButton)
    //				{
    //					var item = UIActivity.FromObject (ViewModel.Changeset.Url);
    //					var activityItems = new MonoTouch.Foundation.NSObject[] { item };
    //					UIActivity[] applicationActivities = null;
    //					var activityController = new UIActivityViewController (activityItems, applicationActivities);
    //					PresentViewController (activityController, true, null);
    //				}
    //				else if (e.ButtonIndex == showButton)
    //				{
    //					ViewModel.GoToHtmlUrlCommand.Execute(null);
    //				}
                });

                sheet.Dispose();
			};

			sheet.ShowFrom(NavigationItem.RightBarButtonItem, true);
		}

        private void PromptForComment(JavascriptCommentModel model)
        {
			string title = "Line " + (model.LineFrom ?? model.LineTo);

            var sheet = new UIActionSheet(title);
            var addButton = sheet.AddButton("Add Comment");
            var cancelButton = sheet.AddButton("Cancel");
            sheet.CancelButtonIndex = cancelButton;
            sheet.DismissWithClickedButtonIndex(cancelButton, true);
            sheet.Dismissed += (sender, e) => {
                BeginInvokeOnMainThread(() =>
                {
                    if (e.ButtonIndex == addButton)
    					ShowCommentComposer(model.LineFrom, model.LineTo);
                });

                sheet.Dispose();
            };

            sheet.ShowInView(this.View);
        }

        private void PromptForComment(JavascriptCommentModel model)
        {
            var title = "Line " + model.FileLine;
            var sheet = new UIActionSheet(title);
            var addButton = sheet.AddButton("Add Comment");
            var cancelButton = sheet.AddButton("Cancel");
            sheet.CancelButtonIndex = cancelButton;
            sheet.Dismissed += (sender, e) =>
            {
                BeginInvokeOnMainThread(() =>
                {
                    if (e.ButtonIndex == addButton)
                        ShowCommentComposer(model.PatchLine);
                });

                sheet.Dispose();
            };

            sheet.ShowInView(this.View);
        }

		/// <summary>
		/// Event when the settings toolbar item is clicked
		/// </summary>
		partial void Settings (NSObject sender)
		{
			if (actionSheet == null) {
				actionSheet = new UIActionSheet();
				actionSheet.AddButton ("Logout");
				actionSheet.Dismissed += (s, e) => {
					if (e.ButtonIndex == 0) {
						var loginController = Storyboard.InstantiateViewController<LoginController>();
						Theme.TransitionController(loginController);
					}
					
					actionSheet.Dispose ();
					actionSheet = null;
				};
				actionSheet.ShowFrom (sender as UIBarButtonItem, true);
			} else {
				actionSheet.DismissWithClickedButtonIndex (-1, true);
			}
		}

        private UIActionSheet CreateExtraMenu()
        {
            var repoModel = ViewModel.Repository;
            if (repoModel == null)
                return null;

            var page = ViewModel.CurrentWikiPage(Web.Url.AbsoluteString);
            var sheet = new UIActionSheet();
            var editButton = page != null ? sheet.AddButton("Edit") : -1;
            var gotoButton = sheet.AddButton("Goto Wiki Page");
            var showButton = page != null ? sheet.AddButton("Show in Bitbucket") : -1;
            var cancelButton = sheet.AddButton("Cancel");
            sheet.CancelButtonIndex = cancelButton;
            sheet.DismissWithClickedButtonIndex(cancelButton, true);
            sheet.Dismissed += (s, e) => 
            {
                BeginInvokeOnMainThread(() =>
                {
                if (e.ButtonIndex == editButton)
                    HandleEditButton();
                else if (e.ButtonIndex == gotoButton)
                    PromptForWikiPage();
                else if (e.ButtonIndex == showButton)
                    ViewModel.GoToWebCommand.Execute(page);
                });

                sheet.Dispose();
            };

            return sheet;
        }

        void ShareButtonTap (object sender)
        {
            if (ViewModel.Gist == null)
                return;

            var app = Mvx.Resolve<IApplicationService>();
            var isOwner = string.Equals(app.Account.Username, ViewModel.Gist?.Owner?.Login, StringComparison.OrdinalIgnoreCase);

            var sheet = new UIActionSheet();
            var editButton = sheet.AddButton(isOwner ? "Edit" : "Fork");
            var starButton = sheet.AddButton(ViewModel.IsStarred ? "Unstar" : "Star");
            var shareButton = sheet.AddButton("Share");
            var showButton = sheet.AddButton("Show in GitHub");
            var cancelButton = sheet.AddButton("Cancel");
            sheet.CancelButtonIndex = cancelButton;
            sheet.DismissWithClickedButtonIndex(cancelButton, true);
            sheet.Dismissed += (s, e) =>
            {
                BeginInvokeOnMainThread(() =>
                {
                    try
                    {
                        if (e.ButtonIndex == shareButton)
                            AlertDialogService.ShareUrl(ViewModel.Gist?.HtmlUrl, sender as UIBarButtonItem);
                        else if (e.ButtonIndex == showButton)
                            ViewModel.GoToHtmlUrlCommand.Execute(null);
                        else if (e.ButtonIndex == starButton)
                            ViewModel.ToggleStarCommand.Execute(null);
                        else if (e.ButtonIndex == editButton)
                            Compose().ToBackground();
                    }
                    catch
                    {
                    }
                });

                sheet.Dispose();
            };

            sheet.ShowFromToolbar(NavigationController.Toolbar);
        }

 protected virtual UIActionSheet CreateActionSheet(string title)
 {
     var sheet = new UIActionSheet();
     sheet.Dismissed += (sender, e) => sheet.Dispose();
     return sheet;
 }

        private void ShowExtraMenu()
        {
            var sheet = new UIActionSheet();
            var followButton = sheet.AddButton(ViewModel.IsFollowing ? "Unfollow" : "Follow");
            var cancelButton = sheet.AddButton("Cancel");
            sheet.CancelButtonIndex = cancelButton;
            sheet.Dismissed += (s, e) => {
                BeginInvokeOnMainThread(() =>
                {
                    if (e.ButtonIndex == followButton)
                    {
                        ViewModel.ToggleFollowingCommand.Execute(null);
                    }
                });

                sheet.Dispose();
            };

            sheet.ShowInView(this.View);
        }