C# UIButton类代码示例

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

            View.BackgroundColor = UIColor.White;

            var gameNameLabel = new UILabel(new RectangleF(10, 80, View.Frame.Width - 20, 20));
            gameNameLabel.Text = "Spartakiade Quiz";

            View.AddSubview(gameNameLabel);

            var playname = new UITextView(new RectangleF(10, 110, View.Frame.Width - 20, 20));
            playname.BackgroundColor = UIColor.Brown;

            View.AddSubview(playname);

            var btnStartGame = new UIButton(new RectangleF(10, 140, View.Frame.Width - 20, 20));
            btnStartGame.SetTitle("Start game", UIControlState.Normal);
            btnStartGame.BackgroundColor = UIColor.Blue;
            btnStartGame.TouchUpInside += delegate
            {
                NavigationController.PushViewController(new PlayGameController(playname.Text), true);
            };

            View.AddSubview(btnStartGame);
        }

        public override void ViewDidLoad()
        {
            View = new UIView(){ BackgroundColor = UIColor.White};
            base.ViewDidLoad();

            var label = new UILabel(new RectangleF(10, 10, 300, 40));
            Add(label);
            var textField = new UITextField(new RectangleF(10, 50, 300, 40));
            Add(textField);
            var button = new UIButton(UIButtonType.RoundedRect);
            button.SetTitle("Click Me", UIControlState.Normal);
            button.Frame = new RectangleF(10, 90, 300, 40);
            Add(button);
            var button2 = new UIButton(UIButtonType.RoundedRect);
            button2.SetTitle("Go Second", UIControlState.Normal);
            button2.Frame = new RectangleF(10, 130, 300, 40);
            Add(button2);

            var set = this.CreateBindingSet<FirstView, Core.ViewModels.FirstViewModel>();
            set.Bind(label).To(vm => vm.Hello);
            set.Bind(textField).To(vm => vm.Hello);
            set.Bind(button).To(vm => vm.MyCommand);
            set.Bind(button2).To(vm => vm.GoSecondCommand);
            set.Apply();
        }

    public void LoadView()
    {
        mBox = new UIBox(UIConstants.BoxRect, UIConstants.MainBackground);

        mBackgroundTextureLabel = new UILabel(UIConstants.RectLabelOne, UIConstants.CloudRecognition);

        string [] extendedTrackingStyle = {UIConstants.ExtendedTrackingStyleOff, UIConstants.ExtendedTrackingStyleOn};
        mExtendedTracking = new UICheckButton(UIConstants.RectOptionOne, false, extendedTrackingStyle);

        string[] aboutStyles = { UIConstants.AboutLableStyle, UIConstants.AboutLableStyle };
        mAboutLabel = new UICheckButton(UIConstants.RectLabelAbout, false, aboutStyles);

        string[] cameraFlashStyles = {UIConstants.CameraFlashStyleOff, UIConstants.CameraFlashStyleOn};
        mCameraFlashSettings = new UICheckButton(UIConstants.RectOptionThree, false, cameraFlashStyles);

        string[] autofocusStyles = {UIConstants.AutoFocusStyleOff, UIConstants.AutoFocusStyleOn};
        mAutoFocusSetting = new UICheckButton(UIConstants.RectOptionTwo, false, autofocusStyles);

        mCameraLabel = new UILabel(UIConstants.RectLabelTwo, UIConstants.CameraLabelStyle);

        string[,] cameraFacingStyles = new string[2,2] {{UIConstants.CameraFacingFrontStyleOff, UIConstants.CameraFacingFrontStyleOn},{ UIConstants.CameraFacingRearStyleOff, UIConstants.CameraFacingRearStyleOn}};
        UIRect[] cameraRect = { UIConstants.RectOptionFour, UIConstants.RectOptionFive };
        mCameraFacing = new UIRadioButton(cameraRect, 1, cameraFacingStyles);

        string[] closeButtonStyles = {UIConstants.closeButtonStyleOff, UIConstants.closeButtonStyleOn };
        mCloseButton = new UIButton(UIConstants.CloseButtonRect, closeButtonStyles);
    }

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

            _loadDataButton = UIButton.FromType(UIButtonType.RoundedRect);
            _loadDataButton.SetTitle("Hent sanntidsdata", UIControlState.Normal);
            _loadDataButton.Frame = new RectangleF(10, 10, View.Bounds.Width - 20, 50);

            _result = new UITextView(new RectangleF(10, 70, View.Bounds.Width - 20, View.Bounds.Height - 80));
            _result.Font = UIFont.FromName("Arial", 14);
            _result.Editable = false;

            _activityIndicator = new UIActivityIndicatorView(new RectangleF(View.Bounds.Width / 2 - 20, View.Bounds.Height / 2 - 20, 40, 40));
            _activityIndicator.AutoresizingMask = UIViewAutoresizing.FlexibleBottomMargin | UIViewAutoresizing.FlexibleTopMargin | UIViewAutoresizing.FlexibleLeftMargin | UIViewAutoresizing.FlexibleRightMargin;
            _activityIndicator.ActivityIndicatorViewStyle = UIActivityIndicatorViewStyle.WhiteLarge;

            View.AddSubview(_activityIndicator);
            View.AddSubview(_loadDataButton);
            View.AddSubview(_result);

            View.BackgroundColor = UIColor.DarkGray;

            _loadDataButton.TouchUpInside += delegate(object sender, EventArgs e) {
                if(_location != null)
                {
                    _activityIndicator.StartAnimating();
                    _result.Text = "Jobber..." + Environment.NewLine + Environment.NewLine;
                    var coordinate = new GeographicCoordinate(_location.Latitude, _location.Longtitude);
                    ThreadPool.QueueUserWorkItem(o => _sanntid.GetNearbyStops(coordinate, BusStopsLoaded));
                }
            };

            _gpsService.LocationChanged = location => _location = location;
            _gpsService.Start();
        }

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

            View.Frame = UIScreen.MainScreen.Bounds;
            View.BackgroundColor = UIColor.White;
            View.AutoresizingMask = UIViewAutoresizing.FlexibleWidth | UIViewAutoresizing.FlexibleHeight;

            button = UIButton.FromType(UIButtonType.RoundedRect);

            button.Frame = new RectangleF(
                View.Frame.Width / 2 - buttonWidth / 2,
                View.Frame.Height / 2 - buttonHeight / 2,
                buttonWidth,
                buttonHeight);

            button.SetTitle("Click me", UIControlState.Normal);

            button.TouchUpInside += (object sender, EventArgs e) =>
            {
                button.SetTitle(String.Format("clicked {0} times", numClicks++), UIControlState.Normal);
            };

            button.AutoresizingMask = UIViewAutoresizing.FlexibleWidth | UIViewAutoresizing.FlexibleTopMargin |
                UIViewAutoresizing.FlexibleBottomMargin;

            View.AddSubview(button);
        }

		public void AddSiteUrl(RectangleF frame)
		{
			url = UIButton.FromType(UIButtonType.Custom);
			url.LineBreakMode = UILineBreakMode.TailTruncation;
			url.HorizontalAlignment = UIControlContentHorizontalAlignment.Left;
			url.TitleShadowOffset = new SizeF(0, 1);
			url.SetTitleColor(UIColor.FromRGB (0x32, 0x4f, 0x85), UIControlState.Normal);
			url.SetTitleColor(UIColor.Red, UIControlState.Highlighted);
			url.SetTitleShadowColor(UIColor.White, UIControlState.Normal);
			url.AddTarget(delegate { if (UrlTapped != null) UrlTapped (); }, UIControlEvent.TouchUpInside);
			
			// Autosize the bio URL to fit available space
			var size = _urlSize;
			var urlFont = UIFont.BoldSystemFontOfSize(size);
			var urlSize = new NSString(_bio.Url).StringSize(urlFont);
			var available = Util.IsPad() ? 400 : 185; // Util.IsRetina() ? 185 : 250;		
			while(urlSize.Width > available)
			{
				urlFont = UIFont.BoldSystemFontOfSize(size--);
				urlSize = new NSString(_bio.Url).StringSize(urlFont);
			}
			
			url.Font = urlFont;			
			url.Frame = new RectangleF ((float)_left, (float)70, (float)(frame.Width - _left), (float)size);
			url.SetTitle(_bio.Url, UIControlState.Normal);
			url.SetTitle(_bio.Url, UIControlState.Highlighted);			
			AddSubview(url);
		}

		const int buttonSpace = 45; //24;
		
		public SessionCell (UITableViewCellStyle style, NSString ident, Session showSession, string big, string small) : base (style, ident)
		{
			SelectionStyle = UITableViewCellSelectionStyle.Blue;
			
			titleLabel = new UILabel () {
				TextAlignment = UITextAlignment.Left,
				BackgroundColor = UIColor.FromWhiteAlpha (0f, 0f)
			};
			speakerLabel = new UILabel () {
				TextAlignment = UITextAlignment.Left,
				Font = smallFont,
				TextColor = UIColor.DarkGray,
				BackgroundColor = UIColor.FromWhiteAlpha (0f, 0f)
			};
			locationImageView = new UIImageView();
			locationImageView.Image = building;

			button = UIButton.FromType (UIButtonType.Custom);
			button.TouchDown += delegate {
				UpdateImage (ToggleFavorite ());
				if (AppDelegate.IsPad) {
					NSObject o = new NSObject();
					NSDictionary progInfo = NSDictionary.FromObjectAndKey(o, new NSString("FavUpdate"));

					NSNotificationCenter.DefaultCenter.PostNotificationName(
						"NotificationFavoriteUpdated", o, progInfo);
				}
			};
			UpdateCell (showSession, big, small);
			
			ContentView.Add (titleLabel);
			ContentView.Add (speakerLabel);
			ContentView.Add (button);
			ContentView.Add (locationImageView);
		}

        public TabControlItem(CGRect frame, string title)
        {
            this.Frame = frame;
            var parentFrame = frame;
            var labelFont = UIDevice.CurrentDevice.UserInterfaceIdiom == UIUserInterfaceIdiom.Pad ? UIFont.BoldSystemFontOfSize(15) : UIFont.BoldSystemFontOfSize(10);

            this.labelTitle = new UILabel(new CGRect(0, 0, parentFrame.Width / 2, parentFrame.Height))
            {
                Text = title,
                TextAlignment = UITextAlignment.Center,
                AdjustsFontSizeToFitWidth = true,
                LineBreakMode = UILineBreakMode.TailTruncation,
                Lines = 2,
                Font = labelFont
            };

            this.button = new UIButton(new CGRect(0, 0, parentFrame.Width, parentFrame.Height));
            this.viewColor = new UIView(new CGRect(0, parentFrame.Height - 1, parentFrame.Width, 1));

            this.Add(this.labelTitle);
            this.Add(this.button);
            this.Add(this.viewColor);

            this.button.TouchUpInside += (s, e) =>
            {
                if (tabEnabled)
                {
                    SelectTab();
                }
            };
        }

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

            var button = new UIButton(UIButtonType.RoundedRect);
            button.SetTitle("Search", UIControlState.Normal);
            Add(button);

            var text = new UITextField() { BorderStyle = UITextBorderStyle.RoundedRect };
            Add(text);

            View.SubviewsDoNotTranslateAutoresizingMaskIntoConstraints();

            var set = this.CreateBindingSet<SearchView, SearchViewModel>();
            set.Bind(button).To("Search");
            set.Bind(text).To(vm => vm.SearchText);
            set.Apply();

            var hPadding = 10;
            var vPadding = 10;
            var ButtonWidth = 100;

            View.AddConstraints(

                    button.AtTopOf(View).Plus(vPadding),
                    button.AtRightOf(View).Minus(hPadding),
                    button.Width().EqualTo(ButtonWidth),

                    text.AtLeftOf(View, hPadding),
                    text.ToLeftOf(button, hPadding),
                    text.WithSameTop(button)

                );
        }

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

            button1 = UIButton.FromType(UIButtonType.RoundedRect);
            button1.Frame = new RectangleF(50, 20, 200, 40);
            button1.SetTitle("#myButton1 .allButtons", UIControlState.Normal);
            PXEngine.SetStyleId(button1, "myButton1");
            PXEngine.SetStyleClass(button1, "allButtons");

            button2 = UIButton.FromType(UIButtonType.RoundedRect);
            button2.Frame = new RectangleF(50, 70, 200, 40);
            button2.SetTitle("#myButton2 .allButtons", UIControlState.Normal);
            PXEngine.SetStyleId(button2, "myButton2");
            PXEngine.SetStyleClass(button2, "allButtons");

            button3 = UIButton.FromType(UIButtonType.RoundedRect);
            button3.Frame = new RectangleF(50, 120, 200, 40);
            button3.SetTitle("#myButton3 .allButtons", UIControlState.Normal);
            PXEngine.SetStyleId(button3, "myButton3");
            PXEngine.SetStyleClass(button1, "allButtons");

            PXEngine.SetStyleCSS(button3, "background-color: green; border-radius: 5;");

            this.View.AddSubview(button1);
            this.View.AddSubview(button2);
            this.View.AddSubview(button3);
        }

        public override void ViewDidLoad()
        {
            var mapView = new MKMapView();
            mapView.Delegate = new MyDelegate();
            View = mapView;

            base.ViewDidLoad();

            // ios7 layout
            if (RespondsToSelector(new Selector("edgesForExtendedLayout")))
                EdgesForExtendedLayout = UIRectEdge.None;

            var secondViewModel = (SecondViewModel)ViewModel;
            var hanAnnotation = new ZombieAnnotation(secondViewModel.Han);

            mapView.AddAnnotation(hanAnnotation);

            mapView.SetRegion(MKCoordinateRegion.FromDistance(
                new CLLocationCoordinate2D(secondViewModel.Han.Location.Lat, secondViewModel.Han.Location.Lng),
                20000,
                20000), true);

            var button = new UIButton(UIButtonType.RoundedRect);
            button.Frame = new RectangleF(10, 10, 300, 40);
            button.SetTitle("move", UIControlState.Normal);
            Add(button);

            var set = this.CreateBindingSet<SecondView, Core.ViewModels.SecondViewModel>();
            set.Bind(hanAnnotation).For(a => a.Location).To(vm => vm.Han.Location);
            set.Bind(button).For("Title").To(vm => vm.Han.Location);
            set.Apply();
        }

		async partial void ConnectToBandClick (UIButton sender)
		{
			if (client == null) {
				// get the client
				client = manager.AttachedClients.FirstOrDefault ();

				if (client == null) {
					Output ("Failed! No Bands attached.");
				} else {

					// attach event handlers
					client.ButtonPressed += (_, e) => {
						Output (string.Format ("Button {0} Pressed: {1}", e.TileButtonEvent.ElementId, e.TileButtonEvent.TileName));
					};
					client.TileOpened += (_, e) => {
						Output (string.Format ("Tile Opened: {0}", e.TileEvent.TileName));
					};
					client.TileClosed += (_, e) => {
						Output (string.Format ("Tile Closed: {0}", e.TileEvent.TileName));
					};

					try {
						Output ("Please wait. Connecting to Band...");
						await manager.ConnectTaskAsync (client);
					} catch (BandException ex) {
						Output ("Failed to connect to Band:");
						Output (ex.Message);
					}
				}
			} else {
				Output ("Please wait. Disconnecting from Band...");
				await manager.DisconnectTaskAsync (client);
				client = null;
			}
		}

        public override void LayoutSubviews()
        {
            base.LayoutSubviews();
            var cameraFound = false;

            if (UIImagePickerController.IsSourceTypeAvailable(UIImagePickerControllerSourceType.Camera))
            {
                cameraFound = true;

                var button = new UIButton(UIButtonType.Custom);
                button.Frame = new CoreGraphics.CGRect(Frame.Width - 44, 9, 28, 21);
                button.SetBackgroundImage(UIImage.FromFile("Barcode.png"), UIControlState.Normal);
                button.TouchUpInside += (sender, e) =>
                {
                    button.PulseToSize(0.7f, 0.3, false);
                    Clicked();
                };
                Subviews[0].AddSubview(button);
            }                      

            foreach(var view in Subviews[0].Subviews)
            {
                if (cameraFound && view.GetType() == typeof(UITextField))
                    view.Frame = new CoreGraphics.CGRect(6, 5, view.Frame.Width - 44, 30);

                var textfield = Subviews[0].Subviews[1] as UITextField;
                if (textfield != null)
                    textfield.Font = UIFont.FromName("Avenir-Book", 14);
            };

        }

        public Task SaveAndLaunchFile(Stream stream, string fileType)
        {
            if (OriginView == null) return Task.FromResult(true);

            var data = NSData.FromStream(stream);
            var width = 824;
            var height = 668;

            var popoverView = new UIView(new RectangleF(0, 0, width, height));
            popoverView.BackgroundColor = UIColor.White;
            var webView = new UIWebView();
            webView.Frame = new RectangleF(0, 45, width, height - 45);

            var b = new UIButton(UIButtonType.RoundedRect);
            b.SetTitle("Done", UIControlState.Normal);
            b.Frame = new RectangleF(10,10, 60, 25);
            b.TouchUpInside += (o, e) => _popoverController.Dismiss(true);

            popoverView.AddSubview(b);
            popoverView.AddSubview(webView);

            var bundlePath = NSBundle.MainBundle.BundlePath;
            System.Diagnostics.Debug.WriteLine(bundlePath);
            webView.LoadData(data, "application/pdf", "utf-8", NSUrl.FromString("http://google.com"));

            var popoverContent = new UIViewController();
            popoverContent.View = popoverView;

            _popoverController = new UIPopoverController(popoverContent);
            _popoverController.PopoverContentSize = new SizeF(width, height);
            _popoverController.PresentFromRect(new RectangleF(OriginView.Frame.Width/2, 50, 1, 1), OriginView, UIPopoverArrowDirection.Any, true);
            _popoverController.DidDismiss += (o, e) => _popoverController = null;

            return Task.FromResult(true);
        }

		void ReleaseDesignerOutlets ()
		{
			if (Button != null) {
				Button.Dispose ();
				Button = null;
			}
		}