C# UIImageView.AddGestureRecognizer方法代码示例

        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 ();
			
			nfloat r = 0;
			nfloat dx = 0;
			nfloat dy = 0;
			
			using (var image = UIImage.FromFile ("monkey.png")) {
				imageView = new UIImageView (image){Frame = new CGRect (new CGPoint(0,0), image.Size)};
				imageView.UserInteractionEnabled = true;
				View.AddSubview (imageView);
			}
			rotateGesture = new UIRotationGestureRecognizer ((() => {
				if ((rotateGesture.State == UIGestureRecognizerState.Began || rotateGesture.State == UIGestureRecognizerState.Changed) && (rotateGesture.NumberOfTouches == 2)) {

					imageView.Transform = CGAffineTransform.MakeRotation (rotateGesture.Rotation + r);
				} else if (rotateGesture.State == UIGestureRecognizerState.Ended) {
					r += rotateGesture.Rotation;
				}
			}));

			
			panGesture = new UIPanGestureRecognizer (() => {
				if ((panGesture.State == UIGestureRecognizerState.Began || panGesture.State == UIGestureRecognizerState.Changed) && (panGesture.NumberOfTouches == 1)) {
					
					var p0 = panGesture.LocationInView (View);
					
					if (dx == 0)
						dx = p0.X - imageView.Center.X;
					
					if (dy == 0)
						dy = p0.Y - imageView.Center.Y;
					
					var p1 = new CGPoint (p0.X - dx, p0.Y - dy);
					
					imageView.Center = p1;
				} else if (panGesture.State == UIGestureRecognizerState.Ended) {
					dx = 0;
					dy = 0;
				}
			});
			
			imageView.AddGestureRecognizer (panGesture);
			imageView.AddGestureRecognizer (rotateGesture);
			
			View.BackgroundColor = UIColor.White;
		}

		public DogViewController ()
		{
			var iv = new UIImageView (UIImage.FromBundle ("Dog.jpg"));
			iv.UserInteractionEnabled = true;
			iv.AddGestureRecognizer (new UITapGestureRecognizer (g => {
				DismissViewController (true, null);
			}));
			View = iv;
		}

        public MenuButton(string path, CGRect frame)
        {
            image = new UIImageView();
            image.Image = UIImage.FromFile(path);
            image.Frame = frame;

            CustomView = image;

            image.AddGestureRecognizer(new UITapGestureRecognizer(OnImageClick));
        }

		// ---------------------------------------------------------------------------
		//
		// METHODS
		//
		// ---------------------------------------------------------------------------

		//
		// Set up the custom renderer. In this case, that means set up the gesture
		// recognizer.
		//
		protected override void OnElementChanged(ElementChangedEventArgs<Image> e) {
			base.OnElementChanged (e);
			if (e.NewElement != null) {
				// Grab the Xamarin.Forms control (not native)
				formsElement = e.NewElement as CustomImage;
				// Grab the native representation of the Xamarin.Forms control
				nativeElement = Control as UIImageView;
				// Set up a tap gesture recognizer on the native control
				nativeElement.UserInteractionEnabled = true;
				UITapGestureRecognizer tgr = new UITapGestureRecognizer (TapHandler);
				nativeElement.AddGestureRecognizer (tgr);
			}
		}

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

            var homeBackground = new UIImageView(UIImage.FromBundle("Home"));
            homeBackground.Frame = View.Frame;
            View.AddSubview(homeBackground);

            var tapRecognizer = new UITapGestureRecognizer(() =>
            {
                DismissViewController(true, null);
            });
            homeBackground.UserInteractionEnabled = true;
            homeBackground.AddGestureRecognizer(tapRecognizer);
        }

		public override void ViewDidLoad ()
		{
			base.ViewDidLoad ();
			imageView = new UIImageView (View.Bounds) {
				UserInteractionEnabled = true
			};
			imageView.AddGestureRecognizer (new UITapGestureRecognizer ((x)=> {
				UpdateImage ();
			}));
			View.AddSubview (imageView);

			sourceImage = UIImage.FromBundle ("DisplayImage");
			Console.WriteLine ("Got: {0}", sourceImage); 
			UpdateImage ();
			var alert = new UIAlertView ("Tap to change image effect", "Tap on the change", null, "Dismiss");
			alert.Show ();
		}

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

            Title = "Gesture Recognizers";

            View.BackgroundColor = UIColor.White;

            lblGestureStatus = new UILabel();
            lblGestureStatus.Text = "Tap Location: ";
            lblGestureStatus.Frame = new RectangleF(0, 350, View.Frame.Width, 44.0f);

            imgTapMe = new UIImageView(UIImage.FromBundle("Images/DoubleTapMe.png"));
            imgTapMe.UserInteractionEnabled = true;
            imgTapMe.Frame = new RectangleF(184, 275, 56, 56);

            //TODO: Step 10 - Add a tap gesture recognizer
            var tapGestureRecognizer = new UITapGestureRecognizer();
            tapGestureRecognizer.AddTarget(
                (tg) =>
                {
                    var currTapGesture = (tg as UITapGestureRecognizer);
                    if (currTapGesture == null) return;

                    lblGestureStatus.Text = string.Format("Tap Location: @{0}", currTapGesture.LocationOfTouch(0, imgTapMe));
                });
            tapGestureRecognizer.NumberOfTapsRequired = 2;

            imgTapMe.AddGestureRecognizer(tapGestureRecognizer);


            imgDragMe = new UIImageView(UIImage.FromBundle("Images/DragMe.png"));
            imgDragMe.UserInteractionEnabled = true;
            imgDragMe.Frame = new RectangleF(78, 275, 56, 56);

            //TODO: Step 11a - Add a pan gesture recognizer for drag motions
            imgDragMe.AddGestureRecognizer(new UIPanGestureRecognizer(HandleDrag));

            originalImageFrame = imgDragMe.Frame;

            View.AddSubviews(new UIView[] { lblGestureStatus, imgDragMe, imgTapMe });
        }

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

            View.BackgroundColor = UIColor.White;

            scrollView = new UIScrollView (View.Bounds) {
                BackgroundColor = UIColor.Gray
            };

            // Setup mats view
            marsView = new UIImageView (UIImage.FromBundle ("mars.jpg")){
                UserInteractionEnabled = true,
            };
            marsView.AddGestureRecognizer (new UITapGestureRecognizer (()=> {
                // We'll introduce an artifical delay to feel more like MKMapView for this demonstration.
                NSTimer.CreateScheduledTimer (new TimeSpan (0, 0, 0, 0, 333), ()=> InvokeOnMainThread (()=> calloutView.DismissCallout (true)));
            }));
            scrollView.AddSubview (marsView);
            scrollView.ContentSize = marsView.Frame.Size;
            scrollView.ContentOffset = new PointF (150, 50);

            //Setup top Pin
            topPin = new MKPinAnnotationView (null, "") {
                Center = new PointF (View.Frame.Width/2 + 230, View.Frame.Height/2)
            };
            topPin.AddGestureRecognizer (new UITapGestureRecognizer (()=> {
                // now in this example we're going to introduce an artificial delay in order to make our popup feel identical to MKMapView.
                // MKMapView has a delay after tapping so that it can intercept a double-tap for zooming. We don't need that delay but we'll
                // add it just so things feel the same.
                NSTimer.CreateScheduledTimer (new TimeSpan (0, 0, 0, 0, 333), () => {
                    InvokeOnMainThread (()=> {
                        calloutView.ContentView = null; // clear any custom view that was set by another pin
                        calloutView.BackgroundView = CalloutBackgroundView.SystemBackgroundView; // use the system graphics

                        // This does all the magic. It present the CalloutView
                        calloutView.PresentCallout (topPin.Frame, marsView, scrollView, CalloutArrowDirection.Any, true);

                        // Here's an alternate method that adds the callout *inside* the pin view. This may seem strange, but it's how MKMapView
                        // does it. It brings the selected pin to the front, then pops up the callout inside the pin's view. This way, the callout
                        // is "anchored" to the pin itself. Visually, there's no difference; the callout still looks like it's floating outside the pin.

                        // calloutView.PresentCallout (topPin.Bounds, topPin, scrollView, CalloutArrowDirection.Down, true);

                    });
                });
            }));
            marsView.AddSubview (topPin);

            // Setup disclosure button
            var topDisclosure = UIButton.FromType (UIButtonType.DetailDisclosure);
            topDisclosure.AddGestureRecognizer (new UITapGestureRecognizer (()=> {
                InvokeOnMainThread (()=> new UIAlertView ("Tap!", "You tapped the disclosure button.", null, "Ok", null).Show ());
            }));

            // Now lets stup our calloutView
            calloutView = new CalloutView () {
                Title = "Curiosity",
                Subtitle = "Mars Rover",
                RightAccessoryView = topDisclosure,
                CalloutOffset = topPin.CalloutOffset
            };

            View.AddSubview (scrollView);
        }

        void SetupPhotos()
        {
            nfloat height = this.Frame.Size.Height;
            nfloat width = this.Frame.Size.Width;
            cp_mask = new UIView(new CGRect(0, 0, width, height * Constants.CP_RATIO));
            pp_mask = new UIView(new CGRect(width * Constants.PP_X_RATIO, height * Constants.PP_Y_RATIO, height * Constants.PP_RATIO, height * Constants.PP_RATIO));
            pp_circle = new UIView(new CGRect(pp_mask.Frame.Location.X - Constants.PP_BUFF, pp_mask.Frame.Location.Y - Constants.PP_BUFF, pp_mask.Frame.Size.Width + 2 * Constants.PP_BUFF, pp_mask.Frame.Size.Height + 2 * Constants.PP_BUFF));
            pp_circle.BackgroundColor = UIColor.White;
            pp_circle.Layer.CornerRadius = pp_circle.Frame.Size.Height / 2;
            pp_mask.Layer.CornerRadius = pp_mask.Frame.Size.Height / 2;
            cp_mask.BackgroundColor = new UIColor(0.98f, 0.98f, 0.98f, 1);

            nfloat cornerRadius = this.Layer.CornerRadius;
            UIBezierPath maskPath = UIBezierPath.FromRoundedRect(cp_mask.Bounds, UIRectCorner.TopLeft | UIRectCorner.TopRight, new CGSize(cornerRadius, cornerRadius));
            CAShapeLayer maskLayer = new CAShapeLayer();
            maskLayer.Frame = cp_mask.Bounds;
            maskLayer.Path = maskPath.CGPath;
            cp_mask.Layer.Mask = maskLayer;

            UIBlurEffect blurEffect = UIBlurEffect.FromStyle(UIBlurEffectStyle.Light);
            visualEffectView = new UIVisualEffectView(blurEffect);
            visualEffectView.Frame = cp_mask.Frame;
            visualEffectView.Alpha = 0;

            profileImageView = new UIImageView();
            profileImageView.Frame = new CGRect(0, 0, pp_mask.Frame.Size.Width, pp_mask.Frame.Size.Height);
            coverImageView = new UIImageView();
            coverImageView.Frame = cp_mask.Frame;
            coverImageView.ContentMode = UIViewContentMode.ScaleAspectFill;

            cp_mask.AddSubview(coverImageView);
            pp_mask.AddSubview(profileImageView);
            cp_mask.ClipsToBounds = true;
            pp_mask.ClipsToBounds = true;

            // setup the label
            nfloat titleLabelX = pp_circle.Frame.Location.X + pp_circle.Frame.Size.Width;
            titleLabel = new UILabel(new CGRect(titleLabelX, cp_mask.Frame.Size.Height + 7, this.Frame.Size.Width - titleLabelX, 26));
            titleLabel.AdjustsFontSizeToFitWidth = false;
            titleLabel.LineBreakMode = UILineBreakMode.Clip;
            titleLabel.Font = UIFont.FromName("HelveticaNeue-Light", 20);
            titleLabel.TextColor = new UIColor(0, 0, 0, 0.8f);
            titleLabel.Text = "Title Label";
            titleLabel.UserInteractionEnabled = true;
            UITapGestureRecognizer tapGesture = new UITapGestureRecognizer(this.TitleLabelTap);
            titleLabel.AddGestureRecognizer(tapGesture);
            coverImageView.UserInteractionEnabled = true;
            UITapGestureRecognizer tapGestureCover = new UITapGestureRecognizer(this.CoverPhotoTap);
            coverImageView.AddGestureRecognizer(tapGestureCover);
            profileImageView.UserInteractionEnabled = true;
            UITapGestureRecognizer tapGestureProfile = new UITapGestureRecognizer(this.ProfilePhotoTap);
            profileImageView.AddGestureRecognizer(tapGestureProfile);
            this.AddSubview(titleLabel);
            this.AddSubview(cp_mask);
            this.AddSubview(pp_circle);
            this.AddSubview(pp_mask);
            coverImageView.AddSubview(visualEffectView);
        }

        /// <summary>
        /// Show Menu.
        /// </summary>
        public void Show()
        {
            if (isVisible) return;
            isVisible = true;

            WillShowMenu(true);

            if (HideStatusBar)
                UIApplication.SharedApplication.SetStatusBarHidden(true, false);

            originalSize = internalTopView.View.Frame.Size;

            SizeF size = new SizeF(originalSize.Width / 2f, originalSize.Height / 2f);
            float x = (View.Frame.Width - (size.Width / 2));
            float y = (View.Frame.Height - size.Height) / 2f;

            if (showTrail)
            {
                snapshotTrail = new UIImageView(TakeSnapshot(internalTopView.View));
                snapshotTrail.Frame = new RectangleF(0, 0, originalSize.Width, originalSize.Height);
                snapshotTrail.Alpha = 0.2f;
                View.AddSubview(snapshotTrail);
            }

            snapshot = new UIImageView(TakeSnapshot(internalTopView.View));
            snapshot.Frame = new RectangleF(0, 0, originalSize.Width, originalSize.Height);
            snapshot.UserInteractionEnabled = true;
            View.AddSubview(snapshot);

            internalTopView.View.Hidden = true;

            UIView.Animate(AnimationSpeed, 0, UIViewAnimationOptions.CurveEaseOut, 
            delegate 
            { 
                snapshot.Frame = new RectangleF(x, y, size.Width, size.Height); 
            },
            delegate
            {
                snapshot.AddGestureRecognizer(tapGesture);
            });

            if (showTrail)
            {
                UIView.Animate(AnimationSpeed, 0.1, UIViewAnimationOptions.CurveEaseOut, delegate 
                { 
                    snapshotTrail.Frame = new RectangleF(x, y, size.Width, size.Height); 
                }, 
                null);
            }
        }

		// Add gesture recognizers to one of our images
		void AddGestureRecognizersToImage (UIImageView image)
		{
			image.UserInteractionEnabled = true;
			
			var rotationGesture = new UIRotationGestureRecognizer (RotateImage);
			image.AddGestureRecognizer (rotationGesture);
			
			var pinchGesture = new UIPinchGestureRecognizer (ScaleImage);
			pinchGesture.Delegate = new GestureDelegate (this);
			image.AddGestureRecognizer (pinchGesture);
			
			var panGesture = new UIPanGestureRecognizer (PanImage);
			panGesture.MaximumNumberOfTouches = 2;
			panGesture.Delegate = new GestureDelegate (this);
			image.AddGestureRecognizer (panGesture);
			
			var longPressGesture = new UILongPressGestureRecognizer (ShowResetMenu);
			image.AddGestureRecognizer (longPressGesture);
		}

        void DidTapCaptureButton(object sender, EventArgs e)
        {
            if (_imageView != null)
            {
                _imageView.RemoveFromSuperview();
                _imageView = null;
            }

            _imageView = new UIImageView(this.View.Bounds);

            _imageView.UserInteractionEnabled = true;
            _imageView.ContentMode = UIViewContentMode.Center;
            _imageView.BackgroundColor = UIColor.Black;
            _imageView.Image = _cropperView.ProcessedImage();

            this.View.AddSubview(_imageView);

            UITapGestureRecognizer tapRecognizer = new UITapGestureRecognizer(GestureRecognizerDidTap);
            _imageView.AddGestureRecognizer(tapRecognizer);
        }

        private void createViewBackButton()
        {
            this.viewBackButton = new UIImageView ();
            this.viewBackButton.Image = UIImage.FromFile ("Image/backButton.png");
            this.viewBackButton.Tag = 1235;
            //float with = 60;
            this.viewBackButton.Frame = new CoreGraphics.CGRect (20, 10, backButtonWidth, 30);
            this.viewBackButton.UserInteractionEnabled = true;
            var tapRecognizer = new UITapGestureRecognizer (delegate(UITapGestureRecognizer obj) {
                //ViewController.ParentViewController.NavigationController.PopViewController (true);
                var rootController = UIApplication.SharedApplication.KeyWindow.RootViewController.ChildViewControllers [0];
                var navcontroller = rootController as UINavigationController;
                if (navcontroller != null)
                    rootController = navcontroller.PopViewController (true);
            });
            viewBackButton.AddGestureRecognizer (tapRecognizer);

            /*
            ViewController.ParentViewController.NavigationItem.SetLeftBarButtonItem (
                new UIBarButtonItem (UIImage.FromFile ("Image/backButton.png")
                    , UIBarButtonItemStyle.Plain
                    , (sender, args) => {
                    this.NavigationController.PopViewController (true);
                })
                , true);
                */
            this.NavigationBar.AddSubview (this.viewBackButton);
        }

        private void InitializeEmptyImage()
        {
            this.imageView = new UIImageView (EmptyImageCanvas.MakeEmptyCanvas ()) {
                ContentMode = UIViewContentMode.ScaleToFill,
                AutoresizingMask = UIViewAutoresizing.All,
                Frame = View.Bounds
            };
            this.View.BackgroundColor = UIColor.Clear;

            this.imageView.UserInteractionEnabled = true;
            this.View.UserInteractionEnabled = true;

            doubletap = new UITapGestureRecognizer (AddImage);
            doubletap.NumberOfTapsRequired = 2;
            this.dtdelegate = new GestureDelegate ();
            doubletap.Delegate = dtdelegate;
            imageView.AddGestureRecognizer (doubletap);

            longpress = new UILongPressGestureRecognizer (RemoveImage);
            longpress.Delegate = dtdelegate;
            imageView.AddGestureRecognizer (longpress);

            View.AddSubview (imageView);
            makeCornersRound ();
        }