C# UIViewController类代码示例

        public override void ViewDidLoad()
        {
            base.ViewDidLoad ();

            // Configure the page view controller and add it as a child view controller.
            PageViewController = new UIPageViewController (UIPageViewControllerTransitionStyle.PageCurl, UIPageViewControllerNavigationOrientation.Horizontal, UIPageViewControllerSpineLocation.Min);
            PageViewController.WeakDelegate = this;

            var startingViewController = ModelController.GetViewController (0, Storyboard);
            var viewControllers = new UIViewController[] { startingViewController };
            PageViewController.SetViewControllers (viewControllers, UIPageViewControllerNavigationDirection.Forward, false, null);

            PageViewController.WeakDataSource = ModelController;

            AddChildViewController (PageViewController);
            View.AddSubview (PageViewController.View);

            // Set the page view controller's bounds using an inset rect so that self's view is visible around the edges of the pages.
            var pageViewRect = View.Bounds;
            if (UIDevice.CurrentDevice.UserInterfaceIdiom == UIUserInterfaceIdiom.Pad)
                pageViewRect = new CGRect (pageViewRect.X + 20, pageViewRect.Y + 20, pageViewRect.Width - 40, pageViewRect.Height - 40);
            PageViewController.View.Frame = pageViewRect;

            PageViewController.DidMoveToParentViewController (this);

            // Add the page view controller's gesture recognizers to the book view controller's view so that the gestures are started more easily.
            View.GestureRecognizers = PageViewController.GestureRecognizers;
        }

		public StartMapViewController (UIViewController msp, IMapLocationRequest maplocationRequest) 
			: base("StartMapViewController", null)
		{
			_MaplocationRequest = maplocationRequest;
			_MSP = msp;
			_list = new List<ImageInfo> ();									
		}

        internal async static Task<string> DownloadInvoiceAsync(int employeeId, UIViewController context)
        {
            var myFiles = await GetDefaultDocumentFiles(context);

            var invoiceFile = myFiles.FirstOrDefault(file => 
                file.Name.Equals(String.Format("invoice_{0}.pdf", employeeId)));

            var actualInvoiceFile = invoiceFile as Microsoft.Office365.SharePoint.File;

            if (actualInvoiceFile == null)
            {
                return null;
            }

            var invoiceStream = await actualInvoiceFile.DownloadAsync();
            var invoicePath = Path.Combine(
                Environment.GetFolderPath(Environment.SpecialFolder.Personal),
                invoiceFile.Name);

            using (var invoiceFileStream = System.IO.File.Create(invoicePath))
            {
                await invoiceStream.CopyToAsync(invoiceFileStream);
            }

            return invoicePath;
        }

		public override void Selected (DialogViewController dvc, UITableView tableView, NSIndexPath path)
		{
			if (IsReadonly) {
				base.Selected (dvc, tableView, path);
				return;
			}

			var controller = new UIViewController ();

			UITextView disclaimerView = new UITextView (controller.View.Frame);
//			disclaimerView.BackgroundColor = UIColor.FromWhiteAlpha (0, 0);
//			disclaimerView.TextColor = UIColor.White;
//			disclaimerView.TextAlignment = UITextAlignment.Left;
			if (!string.IsNullOrWhiteSpace (Value))
				disclaimerView.Text = Value;
			else
				disclaimerView.Text = string.Empty;
			
			disclaimerView.Font = UIFont.SystemFontOfSize (16f);
			disclaimerView.Editable = true;

			controller.View.AddSubview (disclaimerView);
			controller.NavigationItem.Title = Caption;
			controller.NavigationItem.RightBarButtonItem = new UIBarButtonItem (string.IsNullOrEmpty (_saveLabel) ? "Save" : _saveLabel, UIBarButtonItemStyle.Done, (object sender, EventArgs e) => {
				if (OnSave != null)
					OnSave (this, EventArgs.Empty);
				controller.NavigationController.PopViewControllerAnimated (true);
				Value = disclaimerView.Text;
			});	

			dvc.ActivateController (controller);
		}

		public override IUIViewControllerAnimatedTransitioning GetAnimationControllerForDismissedController(UIViewController dismissed)
		{
			var controller = new ModalMenuPickerAnimatedDismissed();
			controller.IsPresenting = false;

			return controller;
		}

		public static void SelectPicture (UIViewController parent, Action<NSDictionary> callback)
		{
			Init ();
			picker.SourceType = UIImagePickerControllerSourceType.PhotoLibrary;
			_callback = callback;
			parent.PresentModalViewController (picker, true);
		}

        //UINavigationController  ;
        public override void ViewDidLoad()
        {
            base.ViewDidLoad ();

            qrReader = new QrScannerViewController();
            qrReader.Title = "Scan";

            attendees = new AttendeeController();
            attendees.Title = "Attendees";

            history = new HistoryController();
            history.Title = "History";

            var u = new UIViewController[]
            {
                attendees,
                qrReader,
                history
            };

            SelectedIndex = 0;
            ViewControllers = u;

            CustomizableViewControllers = new UIViewController[]{};
        }

 public override bool PresentModalViewController(UIViewController viewController, bool animated)
 {
     if (_window.RootViewController == null)
         return false;
     _window.RootViewController.PresentViewController(viewController, true, null);
     return true;
 }

		public UIViewController GetViewer (object value, bool createInspector)
		{
			var vc = value as UIViewController;
			if (vc != null)
				return vc;
			
			var sv = GetSpecialView (value);

			vc = sv as UIViewController;
			if (vc != null && vc.ParentViewController == null) {
				return vc;
			}

			var v = sv as UIView;
			if (v != null && v.Superview == null) {
				vc = new UIViewController ();
				vc.View = v;
				return vc;
			}

			if (createInspector) {
				vc = new UINavigationController (new ObjectInspector(value));
				return vc;
			}

			return null;
		}

		public TabBarController ()
        {
            tabFirst = new UIViewController();
            tabFirst.Title = "Purple";
			//tabFirst.TabBarItem = new UITabBarItem (UITabBarSystemItem.Favorites, 0);
			tabFirst.View.BackgroundColor = UIColor.Purple;

            tabSecond = new UIViewController();
			tabSecond.Title = "Black";
			//tabSecond.TabBarItem = new UITabBarItem ();
			//tabSecond.TabBarItem.Image = UIImage.FromFile ("second.png");

			tabSecond.View.BackgroundColor = UIColor.Black;

            tabThird = new UIViewController();
			tabThird.Title = "Blue";
			//tabThird.TabBarItem.BadgeValue = "New";
			tabThird.View.BackgroundColor = UIColor.Blue;

            var tabs = new UIViewController[] {
				tabFirst, tabSecond, tabThird
            };

            ViewControllers = tabs;
        }

 public static void Present(UIViewController controller)
 {
     UIApplication.SharedApplication.Windows [0].InvokeOnMainThread (delegate {
             UINavigationController navcontroller = (UINavigationController)UIApplication.SharedApplication.Windows[0].RootViewController;
         navcontroller.PresentViewController(controller,true,null);
         });
 }

        public BigItemMasterView()
            : base()
        {
            masterView = new BigItemsScreen();
            detailview = new BigItemDetailScreen();

            masterView.ActivateDetail += (object sender, BigItemDetailClickedEventArgs e) => detailview.ShowDetails (e.lagerobject);

            detailview.BigItemSaved += (object sender, BigItemSavedEventArgs e) => masterView.Refresh ();

            //			detailview.Derezzy += (object sender, DerezLargeObjectEventArgs e) => {
            //                detailnav.PopViewControllerAnimated(true);
            //                masterView.Refresh();
            //            };

            detailview.GotPicture += (object sender, GotPictureEventArgs e) => masterView.Refresh ();

            masternav = new UINavigationController();
            masternav.PushViewController(masterView, false);

            detailnav = new UINavigationController();
            detailnav.PushViewController(detailview, false);

            //always last
            ViewControllers = new UIViewController[] {masternav, detailnav};
        }

        public static void PickContact(UIViewController view, Action<ABPerson> picked)
        {
            /*
            ABAddressBook ab = new ABAddressBook();
            ABPerson p = new ABPerson();

            p.FirstName = "Brittani";
            p.LastName = "Clancey";

            ABMutableMultiValue<string> phones = new ABMutableStringMultiValue();
            phones.Add("9079470168", ABPersonPhoneLabel.Mobile);

            p.SetPhones(phones);

            ab.Add(p);
            ab.Save();
            */

            picker = new ABPeoplePickerNavigationController ();
            //picker.DismissModalViewControllerAnimated (true);
                //picker.Dispose();
            picker.SelectPerson += delegate(object sender, ABPeoplePickerSelectPersonEventArgs e) { picked (e.Person); };

            picker.PerformAction += delegate(object sender, ABPeoplePickerPerformActionEventArgs e) { };

            picker.Cancelled += delegate {
                picker.DismissModalViewControllerAnimated (true);
                picked (null);
                picker.Dispose ();
            };
            view.PresentModalViewController (picker, true);
        }

		public RootTabBarController(){

		//- Set Tab Bar Background Color
			this.TabBar.BackgroundColor = UIColor.FromRGBA(255,0,0,0);
			//this.TabBar.BarTintColor = UIColor.Red;
			this.TabBar.ItemPositioning = UITabBarItemPositioning.Fill;
			//this.TabBar.Center = new CoreGraphics.CGPoint (0, 10);

			//- Settings
			_settingsTab = new IdeaBag.Client.iOS.Views.IdeasViewController();
			_settingsTab.TabBarItem = new UITabBarItem("",
				UIImage.FromBundle("settings-tab").ImageWithRenderingMode(UIImageRenderingMode.AlwaysOriginal),
				UIImage.FromBundle("settings-tab").ImageWithRenderingMode(UIImageRenderingMode.AlwaysOriginal)
			);

			//- Ideas
			_ideasTab = new UIViewController();
			_ideasTab.View.BackgroundColor = UIColor.White;
			_ideasTab.TabBarItem = new UITabBarItem("",
				UIImage.FromBundle("ideas-tab").ImageWithRenderingMode(UIImageRenderingMode.AlwaysOriginal),
				UIImage.FromBundle("ideas-tab-selected").ImageWithRenderingMode(UIImageRenderingMode.AlwaysOriginal)
			);
			_ideasTab.TabBarItem.ImageInsets = new UIEdgeInsets (4, 0, -4, 0);


			//- Notifications
			_notificationsTab = new NotificationsViewController();
			_notificationsTab.TabBarItem = new UITabBarItem("",
				UIImage.FromBundle("notification-tab").ImageWithRenderingMode(UIImageRenderingMode.AlwaysOriginal),
				UIImage.FromBundle("notification-tab").ImageWithRenderingMode(UIImageRenderingMode.AlwaysOriginal)
			);


			//- Contacts
			_contactsTab = new UIViewController();
			_contactsTab.TabBarItem = new UITabBarItem("",
				UIImage.FromBundle("friends-tab").ImageWithRenderingMode(UIImageRenderingMode.AlwaysOriginal),
				UIImage.FromBundle("friends-tab").ImageWithRenderingMode(UIImageRenderingMode.AlwaysOriginal)
			);
			_contactsTab.View.BackgroundColor = UIColor.White;


			//- Map
			_mapTab = new UIViewController();
			_mapTab.TabBarItem = new UITabBarItem("",
				UIImage.FromBundle("map-tab").ImageWithRenderingMode(UIImageRenderingMode.AlwaysOriginal),
				UIImage.FromBundle("map-tab").ImageWithRenderingMode(UIImageRenderingMode.AlwaysOriginal)
			);
			_mapTab.View.BackgroundColor = UIColor.White;

			var tabs = new UIViewController[] {
				_settingsTab, 
				_ideasTab, 
				_notificationsTab,
				_contactsTab,
				_mapTab
			};

			this.ViewControllers = tabs;
		}

 private void SetTitleAndTabBarItem(UIViewController screen, string title, string imageName)
 {
     screen.Title = ViewModel.TextSource.GetText(title);
     screen.TabBarItem = new UITabBarItem(title, UIImage.FromBundle("Images/Tabs/" + imageName + ".png"),
                                          _createdSoFarCount);
     _createdSoFarCount++;
 }