C# UISwipeGestureRecognizer类代码示例

        public TouchDrawView(CGRect rect)
            : base(rect)
        {
            linesInProcess = new Dictionary<string, Line>();
            this.BackgroundColor = UIColor.White;
            this.MultipleTouchEnabled = true;

            UITapGestureRecognizer tapRecognizer = new UITapGestureRecognizer(tap);
            this.AddGestureRecognizer(tapRecognizer);

            UITapGestureRecognizer dbltapRecognizer = new UITapGestureRecognizer(dblTap);
            dbltapRecognizer.NumberOfTapsRequired = 2;
            this.AddGestureRecognizer(dbltapRecognizer);

            UILongPressGestureRecognizer pressRecognizer = new UILongPressGestureRecognizer(longPress);
            this.AddGestureRecognizer(pressRecognizer);

            moveRecognizer = new UIPanGestureRecognizer(moveLine);
            moveRecognizer.WeakDelegate = this;
            moveRecognizer.CancelsTouchesInView = false;
            this.AddGestureRecognizer(moveRecognizer);

            UISwipeGestureRecognizer swipeRecognizer = new UISwipeGestureRecognizer(swipe);
            swipeRecognizer.Direction = UISwipeGestureRecognizerDirection.Up;
            swipeRecognizer.NumberOfTouchesRequired = 3;
            this.AddGestureRecognizer(swipeRecognizer);

            selectedColor = UIColor.Red;
        }

        public override void ViewDidLoad()
        {
            View.BackgroundColor = UIColor.White;

            _imageView = new UIImageView(View.Frame)
            {
                MultipleTouchEnabled = true,
                UserInteractionEnabled = true,
                ContentMode = UIViewContentMode.ScaleAspectFit,
                AutoresizingMask = UIViewAutoresizing.FlexibleWidth | UIViewAutoresizing.FlexibleHeight
            };

            var tapGesture = new UITapGestureRecognizer(OnImageTap);
            _imageView.AddGestureRecognizer(tapGesture);

            var leftSwipe = new UISwipeGestureRecognizer(OnImageSwipe)
            {
                Direction = UISwipeGestureRecognizerDirection.Left
            };
            _imageView.AddGestureRecognizer(leftSwipe);

            var rigthSwipe = new UISwipeGestureRecognizer(OnImageSwipe)
            {
                Direction = UISwipeGestureRecognizerDirection.Right
            };
            _imageView.AddGestureRecognizer(rigthSwipe);
            View.AddSubview(_imageView);

            PHAsset asset = _imageCache.GetAsset(_image.LocalIdentifier);
            UpdateImage(asset);
        }

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

			MainBackButtonTmp.BackButtonClick = true;

			_tabController = this;
			_localizer = new Localizer ();

			CustomUIViewController tabVAC, tabILL, tabOVT, tabPOV, tabEXV;

			tabVAC = CreateTabViewController ("VAC", 0);
			tabILL = CreateTabViewController ("ILL", 1);
			tabOVT = CreateTabViewController ("OVT", 2);
			tabPOV = CreateTabViewController ("POV", 3);
			tabEXV = CreateTabViewController ("EXV", 4);

			var tabs = new CustomUIViewController[] {
				tabVAC, tabILL, tabOVT, tabPOV, tabEXV
			};

			ViewControllers = tabs;
			SelectedViewController = tabVAC;


			_swipeRecognizerRight = new UISwipeGestureRecognizer (OnSwipeRight){
				Direction = UISwipeGestureRecognizerDirection.Right
			};
			_swipeRecognizerLeft = new UISwipeGestureRecognizer (OnSwipeLeft){
				Direction = UISwipeGestureRecognizerDirection.Left
			};

			View.AddGestureRecognizer (_swipeRecognizerRight);
			View.AddGestureRecognizer (_swipeRecognizerLeft);
		}

		/// <summary>
		/// Called when [element changed].
		/// </summary>
		/// <param name="e">The e.</param>
		protected override void OnElementChanged (ElementChangedEventArgs<Editor> e)
		{
			base.OnElementChanged (e);

			var view = (ExtendedEditor)Element;
			if (view != null)
			{
				Control.Font = view.Font.ToUIFont();
			}

			if (e.OldElement == null)
			{
				_leftSwipeGestureRecognizer = new UISwipeGestureRecognizer(() => view.OnLeftSwipe(this, EventArgs.Empty))
					{
						Direction = UISwipeGestureRecognizerDirection.Left
					};

				_rightSwipeGestureRecognizer = new UISwipeGestureRecognizer(()=> view.OnRightSwipe(this, EventArgs.Empty))
					{
						Direction = UISwipeGestureRecognizerDirection.Right
					};

				Control.AddGestureRecognizer(_leftSwipeGestureRecognizer);
				Control.AddGestureRecognizer(_rightSwipeGestureRecognizer);
			}

			if (e.NewElement == null)
			{
				Control.RemoveGestureRecognizer(_leftSwipeGestureRecognizer);
				Control.RemoveGestureRecognizer(_rightSwipeGestureRecognizer);
			}
		}

		protected override void OnElementChanged (VisualElementChangedEventArgs e)
		{
			base.OnElementChanged (e);

			if (e.NewElement != null) {
				tabbedController = (UITabBarController)ViewController;
			}

			if (!isInitialized) {

				rightGesture = new UISwipeGestureRecognizer (swipe => {
					//Check to make sure we aren't at the last view
					Console.WriteLine ("Swipe Left");
					if(this.SelectedIndex != ViewControllers.Length - 1)
						tabbedController.SelectedViewController = ViewControllers [this.SelectedIndex + 1];
				}) {
					Direction = UISwipeGestureRecognizerDirection.Left
				};

				leftGesture = new UISwipeGestureRecognizer (swipe => {
					//Check to make sure we aren't at the first view
					Console.WriteLine ("Swipe Right");
					if(this.SelectedIndex != 0)
						tabbedController.SelectedViewController = ViewControllers [this.SelectedIndex - 1];
				}) {
					Direction = UISwipeGestureRecognizerDirection.Right
				};

				View.AddGestureRecognizer (rightGesture);
				View.AddGestureRecognizer (leftGesture);

				isInitialized = true;
			}
		}

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

            var table = new UITableView (new CoreGraphics.CGRect (0f, 20f, UIScreen.MainScreen.Bounds.Width, UIScreen.MainScreen.Bounds.Height)); // defaults to Plain style
            quotes.Add(new Quote("列表", "向右慢拉返回", ""));
            quotes.Add(new Quote("", "Loading...", ""));
            table.Source = new QuoteTableSource (quotes);

            UISwipeGestureRecognizer swipeGestureRecognizerRight = new UISwipeGestureRecognizer (() => {
                DismissViewController(true, null);
            }){
                Direction = UISwipeGestureRecognizerDirection.Right
            };
            this.View.AddGestureRecognizer (swipeGestureRecognizerRight);

            Thread thread  = new Thread(() => {
                update(location, model);
                InvokeOnMainThread(delegate {
                    table.ReloadData();
                });
            });
            thread.Start ();
            Add (table);
        }

        public Easter(UIView viewForGestures, params Egg[] eggs)
            : base(eggs)
        {
            swipeUp = new UISwipeGestureRecognizer (() => AddCommand (new SwipeUpCommand()));
            swipeUp.Direction = UISwipeGestureRecognizerDirection.Up;
            viewForGestures.AddGestureRecognizer (swipeUp);

            swipeDown = new UISwipeGestureRecognizer (() => AddCommand (new SwipeDownCommand()));
            swipeDown.Direction = UISwipeGestureRecognizerDirection.Down;
            viewForGestures.AddGestureRecognizer (swipeDown);

            swipeLeft = new UISwipeGestureRecognizer (() => AddCommand (new SwipeLeftCommand()));
            swipeLeft.Direction = UISwipeGestureRecognizerDirection.Left;
            viewForGestures.AddGestureRecognizer (swipeLeft);

            swipeRight = new UISwipeGestureRecognizer (() => AddCommand (new SwipeRightCommand()));
            swipeRight.Direction = UISwipeGestureRecognizerDirection.Right;
            viewForGestures.AddGestureRecognizer (swipeRight);

            tap = new UITapGestureRecognizer (() => AddCommand (new TapCommand()));
            tap.NumberOfTapsRequired = 1;
            viewForGestures.AddGestureRecognizer (tap);

            longTap = new UILongPressGestureRecognizer (() => AddCommand (new LongTapCommand()));
            longTap.NumberOfTapsRequired = 1;
            viewForGestures.AddGestureRecognizer (longTap);
        }

		protected override void OnElementChanged (ElementChangedEventArgs<View> e)
		{
			base.OnElementChanged (e);
			//If the NewElement has been queued up
			if (e.NewElement != null) {
				//Set SliderView Instance
				_sliderView = e.NewElement as SliderView;
				//Make the currentView the same dimensions of the SliderView
				_sliderView.Children [currentViewIndex].HeightRequest = _sliderView.Height;
				_sliderView.Children [currentViewIndex].WidthRequest = _sliderView.Width;
				//This is an optional thing, really depends on how you want to use this SliderView
				_sliderView.Children [currentViewIndex].BackgroundColor = _sliderView.BackgroundColor;
			}

			//Create the gesture that brings the view in from the right side
			rightGesture = new UISwipeGestureRecognizer (swipe => {
				Console.WriteLine("Swipe Left");
				//Check to make sure we aren't on the current view
				if (_sliderView.Children.Count > currentViewIndex + 1 ) {
					//Add one to the index
					currentViewIndex++;

					_sliderView.CurrentView = _sliderView.Children [currentViewIndex];
					_sliderView.CurrentView.HeightRequest = _sliderView.Height;
					_sliderView.CurrentView.WidthRequest = _sliderView.Width;
					_sliderView.CurrentView.BackgroundColor = _sliderView.BackgroundColor;

					//Translate the CurrentView onto the ViewScreen
					TranslateToCurrentView ("Left");
				}
			}) {
				Direction = UISwipeGestureRecognizerDirection.Left
			};

			//Create the gesture that brings the view in from the left side
			leftGesture = new UISwipeGestureRecognizer (swipe => {
				//Check to make sure we aren't at the first view
				if (currentViewIndex != 0) {
					//Drop the index one
					currentViewIndex--;

					//Set the new CurrentView
					_sliderView.CurrentView = _sliderView.Children [currentViewIndex];
					//Set the size of the CurrentView to the size of the SliderView
					_sliderView.CurrentView.HeightRequest = _sliderView.Height;
					_sliderView.CurrentView.WidthRequest = _sliderView.Width;
					//This is an optional thing, really depends on how you want to use this SliderView
					_sliderView.CurrentView.BackgroundColor = _sliderView.BackgroundColor;

					//Translate the CurrentView onto the ViewScreen
					TranslateToCurrentView ("Right");
				}
			}) {
				Direction = UISwipeGestureRecognizerDirection.Right
			};

			//Add the Gesture Recognizers to the SliderView
			AddGestureRecognizer (rightGesture);
			AddGestureRecognizer (leftGesture);
		}

        public void HandleRightSwipe(UISwipeGestureRecognizer recogniser)
        {
            Debug.WriteLine("Got a right swipe.");

            SetRandomCurrent ();

            RenderCurrent ();
        }

		// This method is invoked when the application has loaded and is ready to run. In this
		// method you should instantiate the window, load the UI into it and then make the window
		// visible.
		public override bool FinishedLaunching (UIApplication app, NSDictionary options)
		{
			window = new UIWindow (UIScreen.MainScreen.Bounds);

			// create and initialize a UICollectionViewFlowLayout
			layout = new UICollectionViewFlowLayout () {

				HeaderReferenceSize = new SizeF (UIScreen.MainScreen.Bounds.Width, 50),
				SectionInset = new UIEdgeInsets (10,5,10,5),

				MinimumInteritemSpacing = 5,
				MinimumLineSpacing = 5,
				ItemSize = new System.Drawing.SizeF (100, 100)
			};

			// create a CollectionViewController (which is a UICollectionViewController) with a layout
			viewController = new CollectionViewController (layout);

			//TODO: Step 4b: uncomment to implement a left swipe gesture to switch between Collection View Layouts

			// toggle the layout in response to a swipe left
			swipeLeft = new UISwipeGestureRecognizer (g => {

				if (customLayout == null) {

					// create and initialize a CustomLayout
					customLayout = new CustomLayout (viewController.Speakers.Count){
						ItemSize = new SizeF (100, 100)
					};
				}

				if (viewController.CollectionView.CollectionViewLayout is UICollectionViewFlowLayout) {

					// switch to a custom layout
					viewController.CollectionView.SetCollectionViewLayout (customLayout, true);
				} else {

					// invalidate the flow layout in case the orientation changed
					layout.InvalidateLayout();

					// switch to a flow layout
					viewController.CollectionView.SetCollectionViewLayout (layout, true);

					// scroll to the top
					viewController.CollectionView.SetContentOffset(new PointF(0,0), false);
				}
			}){
				Direction = UISwipeGestureRecognizerDirection.Left
			};
			// add the gesture recognizer to the UICollectionView
			viewController.CollectionView.AddGestureRecognizer (swipeLeft);


			window.RootViewController = viewController;
			window.MakeKeyAndVisible ();

			return true;
		}

        protected override void OnElementChanged(ElementChangedEventArgs<Frame> e)
        {
            base.OnElementChanged (e);

            if (e.NewElement == null) {
                RemoveGestureRecognizer ();

                return;
            }

            var gestureView = e.NewElement as GestureAwareContentView;

            _longPressGestureRecognizer = new UILongPressGestureRecognizer (
                sender => {
                    var offset = sender.LocationInView(NativeView);

                    GestureUtil.ExecuteCommand(gestureView.LongPress,
                        new GestureOffset(sender.State.ToGestureState(), offset.X, offset.Y));
                });

            _pinchGestureRecognizer = new UIPinchGestureRecognizer (
                sender => {
                    var scale = sender.Scale;

                    GestureUtil.ExecuteCommand(gestureView.Pinch,
                        new GestureScale(sender.State.ToGestureState(), scale));
                });

            _panGestureRecognizer = new UIPanGestureRecognizer (
                sender => {
                    var offset = sender.TranslationInView(NativeView);

                    GestureUtil.ExecuteCommand(gestureView.Pan,
                        new GestureOffset(sender.State.ToGestureState(), offset.X, offset.Y));
                });

            _swipeGestureRecognizer = new UISwipeGestureRecognizer (
                sender => {
                    var offset = sender.LocationInView(NativeView);

                    GestureUtil.ExecuteCommand(gestureView.Swipe,
                        new GestureOffset(sender.State.ToGestureState(), offset.X, offset.Y));
                });

            _rotationGestureRecognizer = new UIRotationGestureRecognizer (
                sender => {
                    GestureUtil.ExecuteCommand (gestureView.Rotate);
                });

            AddGestureRecognizer (_longPressGestureRecognizer);
            AddGestureRecognizer (_pinchGestureRecognizer);
            AddGestureRecognizer (_panGestureRecognizer);
            AddGestureRecognizer (_swipeGestureRecognizer);
            AddGestureRecognizer (_rotationGestureRecognizer);
        }

		/// <summary>
		/// Adds the gesture.
		/// </summary>
		private void addGesture()
		{
			UISwipeGestureRecognizer swipe = new UISwipeGestureRecognizer (this, new Selector ("HandleSwipe:")) {
				Direction = UISwipeGestureRecognizerDirection.Up
			};
			DetailTextView.AddGestureRecognizer (swipe);
			swipe = new UISwipeGestureRecognizer (this, new Selector ("HandleSwipe:")) {
				Direction = UISwipeGestureRecognizerDirection.Down
			};
			DetailTextView.AddGestureRecognizer (swipe);
		}

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

            View.BackgroundColor = UIColor.Clear;

            Front = new FrontView (reviewableVerses[0]);
            View.BackgroundColor = UIColor.FromPatternImage (UIImage.FromFile (Images.TableViewBackground));

            Back = new BackView (reviewableVerses[position]);

            MemorizedImage = UIImage.FromFile (Images.HeartRedButton);
            NotMemorizedImage = UIImage.FromFile (Images.HeartGreyButton);

            TapGesture = new UITapGestureRecognizer {
                NumberOfTapsRequired = 1
            };
            TapGesture.AddTarget (FlipCardHandler);

            SwipeUpGesture = new UISwipeGestureRecognizer {
                Direction = UISwipeGestureRecognizerDirection.Up
            };
            SwipeUpGesture.AddTarget (NextCardHandler);

            SwipeDownGesture = new UISwipeGestureRecognizer {
                Direction = UISwipeGestureRecognizerDirection.Down,
            };
            SwipeDownGesture.AddTarget (NextCardHandler);

            RightSwipeGesture = new UISwipeGestureRecognizer {
                Direction = UISwipeGestureRecognizerDirection.Right
            };
            RightSwipeGesture.AddTarget (RightSwipeHandler);

            HandleProductTourStep6 ();

            View.Add (Front);
            View.AddGestureRecognizer (SwipeUpGesture);
            View.AddGestureRecognizer (SwipeDownGesture);
            View.AddGestureRecognizer (RightSwipeGesture);
            View.AddGestureRecognizer (TapGesture);
        }

		void FnInitializeView()
		{

			CGRect rectBounds= UIScreen.MainScreen.Bounds;

			flViewBringDownY = rectBounds.Height - 30f; //complete collapse viewContainer
			flViewShiftUpY = rectBounds.Height - 120f;//200 is the heght of viewContainer

			var recognizerRight = new UISwipeGestureRecognizer (FnSwipeLeftToRight);
			recognizerRight.Direction = UISwipeGestureRecognizerDirection.Right;
			View.AddGestureRecognizer ( recognizerRight );

			var recognizerLeft = new UISwipeGestureRecognizer (FnSwipeRightToLeft);
			recognizerLeft.Direction = UISwipeGestureRecognizerDirection.Left;
			View.AddGestureRecognizer ( recognizerLeft );

			viewDecriptionContainer.Hidden = true;

			btnIcon.SetBackgroundImage ( UIImage.FromBundle ( "Images/menu_icon" ) , UIControlState.Normal );

//			btnBottom.SetBackgroundImage ( UIImage.FromBundle ( "Images/up_arrow" ) , UIControlState.Normal );
			btnBottom.SetBackgroundImage ( UIImage.FromBundle ( "Images/down_arrow" ) , UIControlState.Selected );

			btnBottom.TouchUpInside+= delegate(object sender , EventArgs e )
			{
				if(viewDecriptionContainer.Hidden)
					viewDecriptionContainer.Hidden=false;
				
				if(!btnBottom.Selected)
					FnAnimateView(flViewShiftUpY,viewDecriptionContainer);
					else
					FnAnimateView(flViewBringDownY,viewDecriptionContainer); 
				
				btnBottom.Selected = !btnBottom.Selected;
			};
			btnIcon.TouchUpInside += delegate(object sender , EventArgs e )
			{
				FnPerformTableTransition();
			};
		
		}

		/// <summary>
		/// Handles the <see cref="E:ElementChanged" /> event.
		/// </summary>
		/// <param name="e">The <see cref="VisualElementChangedEventArgs"/> instance containing the event data.</param>
		protected override void OnElementChanged(VisualElementChangedEventArgs e)
		{
			base.OnElementChanged(e);

			var page = (ExtendedTabbedPage)Element;

			TabBar.TintColor = page.TintColor.ToUIColor();
			TabBar.BarTintColor = page.BarTintColor.ToUIColor();
			TabBar.BackgroundColor = page.BackgroundColor.ToUIColor();
			

			if (!page.SwipeEnabled)
			{
				return;
			}

			var gesture1 = new UISwipeGestureRecognizer(sw =>
			{
				sw.ShouldReceiveTouch += (recognizer, touch) => !(touch.View is UITableView) && !(touch.View is UITableViewCell);

				if (sw.Direction == UISwipeGestureRecognizerDirection.Right)
				{
					page.InvokeSwipeLeftEvent(null, null);
				}

			}) { Direction = UISwipeGestureRecognizerDirection.Right };

			var gesture2 = new UISwipeGestureRecognizer(sw =>
			{
				sw.ShouldReceiveTouch += (recognizer, touch) => !(touch.View is UITableView) && !(touch.View is UITableViewCell);

				if (sw.Direction == UISwipeGestureRecognizerDirection.Left)
				{
					page.InvokeSwipeRightEvent(null, null);
				}

			}) { Direction = UISwipeGestureRecognizerDirection.Left };

			View.AddGestureRecognizer(gesture1);
			View.AddGestureRecognizer(gesture2);
		}