C# UIActivityIndicatorView类代码示例

		private LoadingIndicator() : base()
		{
			int ScreenWidth = Platform.ScreenWidth;
			int ScreenHeight = Platform.ScreenHeight - 80;
			const int Padding = 10;
			const int TextWidth = 65;
			const int SpinnerSize = 20;
			const int SeparateWidth = 5;
			const int Width = Padding + SpinnerSize + SeparateWidth + TextWidth + Padding;
			const int Height = Padding + SpinnerSize + Padding;
		
			Frame = new RectangleF((ScreenWidth - Width) / 2, ScreenHeight / 2, Width, Height);
			BackgroundColor = UIColor.FromWhiteAlpha(0.5f, 0.5f);
			
			spinner = new UIActivityIndicatorView(UIActivityIndicatorViewStyle.WhiteLarge)
            {
				Frame = new RectangleF(Padding, Padding, SpinnerSize, SpinnerSize)
			};
			
			label = new UILabel
            {
				Frame = new RectangleF(Padding + SpinnerSize + SeparateWidth, Padding, TextWidth, SpinnerSize),
				Text = "Loading...",
				TextColor = StyleExtensions.lightGrayText,
				BackgroundColor = StyleExtensions.transparent,
				AdjustsFontSizeToFitWidth = true
			};
			
			AddSubview(label);
			AddSubview(spinner);
			
			Hidden = true;
		}

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

            //this.View.BackgroundColor = UIColor.Black;

            _activityView = new UIActivityIndicatorView(this.View.Frame);
            //Add(_activityView);
            //View.BringSubviewToFront(_activityView);

            _tableView = new FoldingTableViewController(new System.Drawing.RectangleF(0, 0, 320, 367), UITableViewStyle.Plain);
            var source = new TableSource(_tableView.TableView);

            this.AddBindings(new Dictionary<object, string>()
                                 {
                                     {source, "ItemsSource TweetsPlus"},
                                     //{_activityView, "{'Hidden':{'Path':'IsSearching','Converter':'InvertedVisibility'}}"},
				{_tableView, "Refreshing IsSearching;RefreshHeadCommand RefreshCommand;LastUpdatedText WhenLastUpdatedUtc,Converter=SimpleDate"},
                                 });

            _tableView.TableView.RowHeight = 100;
            _tableView.TableView.Source = source;
            _tableView.TableView.ReloadData();
            this.Add(_tableView.View);

            NavigationItem.SetRightBarButtonItem(new UIBarButtonItem("Tweet", UIBarButtonItemStyle.Bordered, (sender, e) => ViewModel.DoShareGeneral()), false);
        }

		public ProgressLabel (string text)
			: base (new RectangleF (0, 0, 200, 44))
		{
			BackgroundColor = UIColor.Clear;
			
			activity = new UIActivityIndicatorView (UIActivityIndicatorViewStyle.White) {
				Frame = new RectangleF (0, 11.5f, 21, 21),
				HidesWhenStopped = false,
				Hidden = false,
			};
			AddSubview (activity);
			
			var label = new UILabel () {
				Text = text,
				TextColor = UIColor.White,
				Font = UIFont.BoldSystemFontOfSize (20),
				BackgroundColor = UIColor.Clear,
				Frame = new CGRect (25, 0, Frame.Width - 25, 44),
			};
			AddSubview (label);
			
			var f = Frame;
			f.Width = label.Frame.X + label.Text.StringSize (label.Font).Width;
			Frame = f;
		}

		void SetUpActivityIndicator ()
		{
			activityIndicator = new UIActivityIndicatorView (new CGRect (150f, 220f, 20f, 20f));
			if (AppDelegate.IsPad)
				activityIndicator.AutoresizingMask = UIViewAutoresizing.FlexibleMargins;
			activityIndicator.StartAnimating ();
		}

        /// <summary>
        /// this is where we do the meat of creating our alert, which includes adding 
        /// controls, etc.
        /// </summary>
        public override void Draw(RectangleF rect)
        {
            // if the control hasn't been setup yet
            if (activityIndicator == null)
            {
                // if we have a message
                if (!string.IsNullOrEmpty (message))
                {
                    lblMessage = new UILabel (new RectangleF (20, 10, rect.Width - 40, 33));
                    lblMessage.BackgroundColor = UIColor.Clear;
                    lblMessage.TextColor = UIColor.LightTextColor;
                    lblMessage.TextAlignment = UITextAlignment.Center;
                    lblMessage.Text = message;
                    this.AddSubview (lblMessage);
                }

                // instantiate a new activity indicator
                activityIndicator = new UIActivityIndicatorView (UIActivityIndicatorViewStyle.White);
                activityIndicator.Frame = new RectangleF ((rect.Width / 2) - (activityIndicator.Frame.Width / 2)
                    , 50, activityIndicator.Frame.Width, activityIndicator.Frame.Height);
                this.AddSubview (activityIndicator);
                activityIndicator.StartAnimating ();
            }
            base.Draw (rect);
        }

		public async void BeginDownloadingPOC (UIViewController controller, UIImageView imageView, UIActivityIndicatorView acIndicator, string imagePath, bool isCache)
		{
			if (acIndicator != null)
				acIndicator.StartAnimating ();

			UIImage data = null;
			if (imagePath != null)
				data = await GetImageData (imagePath, isCache);
				
			CGPoint center = imageView.Center;

			UIImage finalImage = null;
			if (data != null) {
				finalImage = MUtils.scaledToWidth (data, imageView.Frame.Width * 2);
				imageView.Frame = new CGRect (0.0f, 0.0f, finalImage.Size.Width / 2, finalImage.Size.Height / 2);
			}

			imageView.Image = getImageFrom (finalImage, "noimage.png");
			imageView.Center = center;

			if (acIndicator != null) {
				acIndicator.StopAnimating ();
				acIndicator.Color = UIColor.Clear;
			}
		}

        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 ViewDidAppear(bool animated)
        {
            //			if (_isLoaded)
            //			{
            //				DidRotate(new UIInterfaceOrientation());
            //				return;
            //			}

            base.ViewDidAppear (animated);

            AddComponents ();

            Init ();

            var lbl = new UILabel (new RectangleF(100,0,100,30));
            lbl.Text = "Загрузка";
            lbl.BackgroundColor = UIColor.FromRGBA (0, 0, 0, 0);
            lbl.TextColor = UIColor.White;
            var activitySpinner = new UIActivityIndicatorView(UIActivityIndicatorViewStyle.WhiteLarge);
            activitySpinner.Frame = new RectangleF (0,-35,50,50);
            activitySpinner.AutoresizingMask = UIViewAutoresizing.FlexibleMargins;
            activitySpinner.StartAnimating ();
            _alert = new UIAlertView();
            _alert.Frame.Size = new SizeF (60, 60);
            _alert.AddSubview(activitySpinner);
            _alert.AddSubview (lbl);
            _alert.Show();
            _twitterConection.GeTwittstByTag(_tag, GetNumberOfRows());
            _isSelected = false;
        }

        static void BuildHud()
        {
            if (hud == null) {
                hud = new UIView (UIApplication.SharedApplication.KeyWindow.RootViewController.View.Frame) {
                    BackgroundColor = UIColor.Black,
                    Alpha = 0.8f,
                    AutoresizingMask = UIViewAutoresizing.FlexibleWidth | UIViewAutoresizing.FlexibleHeight
                };

                activity = new UIActivityIndicatorView (UIActivityIndicatorViewStyle.WhiteLarge) {
                    Frame = new RectangleF (hud.Frame.Width / 2 - HUD_SIZE / 2, hud.Frame.Height / 2 - HUD_SIZE / 2 - LABEL_HEIGHT / 2 - 5f, HUD_SIZE, HUD_SIZE),
                    AutoresizingMask = UIViewAutoresizing.FlexibleMargins
                };

                label = new UILabel {
                    Frame = new RectangleF (0f, activity.Frame.Bottom + 10f, hud.Frame.Width, LABEL_HEIGHT),
                    TextAlignment = UITextAlignment.Center,
                    Font = UIFont.BoldSystemFontOfSize (18.0f),
                    AutoresizingMask = UIViewAutoresizing.FlexibleWidth | UIViewAutoresizing.FlexibleTopMargin | UIViewAutoresizing.FlexibleBottomMargin,
                    TextColor = UIColor.White

                };

                hud.AddSubview (activity);
                hud.AddSubview (label);

                //label = new UILabel (new RectangleF (0,  hud.Frame.Width,
            }
        }

		public override void ViewDidLoad ()
		{
			loadingBg = new UIView (this.View.Frame) { BackgroundColor = UIColor.Black };
			loadingView = new UIActivityIndicatorView (UIActivityIndicatorViewStyle.WhiteLarge);
			loadingView.Frame = new RectangleF ((this.View.Frame.Width - loadingView.Frame.Width) / 2, 
				(this.View.Frame.Height - loadingView.Frame.Height) / 2,
				loadingView.Frame.Width, 
				loadingView.Frame.Height);			

			loadingBg.AddSubview (loadingView);
			View.AddSubview (loadingBg);
			loadingView.StartAnimating ();

			scannerView = new ZXingScannerView(new RectangleF(0, 0, this.View.Frame.Width, this.View.Frame.Height));
			scannerView.AutoresizingMask = UIViewAutoresizing.FlexibleWidth | UIViewAutoresizing.FlexibleHeight;
			scannerView.UseCustomOverlayView = this.Scanner.UseCustomOverlay;
			scannerView.CustomOverlayView = this.Scanner.CustomOverlay;
			scannerView.TopText = this.Scanner.TopText;
			scannerView.BottomText = this.Scanner.BottomText;
			scannerView.CancelButtonText = this.Scanner.CancelButtonText;
			scannerView.FlashButtonText = this.Scanner.FlashButtonText;

			//this.View.AddSubview(scannerView);
			this.View.InsertSubviewBelow (scannerView, loadingView);

			this.View.AutoresizingMask = UIViewAutoresizing.FlexibleWidth | UIViewAutoresizing.FlexibleHeight;
		}

		public BusyIndicatorClass (CGRect frame,string strMsg ) :base(frame)
		{
			BackgroundColor = UIColor.Black;
			Alpha = 0.50f; 
			const float flLabelHeight=22;

			float flWidth=Convert.ToSingle(Frame.Width.ToString());
			float flHeight= Convert.ToSingle(Frame.Height.ToString());

			float flLabelWidth=flWidth-20;
			float flCenterX=flWidth/2;
			float flCenterY=flHeight/2;

			spinner= new UIActivityIndicatorView(UIActivityIndicatorViewStyle.White);
			spinner.Frame= new CGRect(flCenterX - ( spinner.Frame.Width / 2 ) , flCenterY - spinner.Frame.Height - 20 , spinner.Frame.Width , spinner.Frame.Height );
			spinner.AutoresizingMask = UIViewAutoresizing.FlexibleMargins;
			AddSubview ( spinner );
			spinner.StartAnimating ();

			lblLoading= new UILabel(new CGRect (flCenterX - ( flLabelWidth / 2 ) , flCenterY + 20 , flLabelWidth , flLabelHeight ) );
			lblLoading.BackgroundColor = UIColor.Clear;
			lblLoading.Text = strMsg;
			lblLoading.TextAlignment = UITextAlignment.Center;
			lblLoading.AutoresizingMask = UIViewAutoresizing.FlexibleMargins;
			AddSubview ( lblLoading );
 
		}

		public ActivityIndicator ()
		{
			Opaque = false;

			var bounds = new CGRect (0, 0, 150, 44);
			Frame = bounds;

			var isDark = DocumentAppDelegate.Shared.Theme.IsDark;
			BackgroundColor = isDark ?
				UIColor.FromWhiteAlpha (1-0.96f, 0.85f) :
				UIColor.FromWhiteAlpha (0.96f, 0.85f);
			Layer.CornerRadius = 12;

			const float margin = 12;

			activity = new UIActivityIndicatorView (isDark ? UIActivityIndicatorViewStyle.White : UIActivityIndicatorViewStyle.Gray) {
				Frame = new CGRect (margin, margin, 21, 21),
				HidesWhenStopped = false,
			};

			titleLabel = new UILabel (new CGRect (activity.Frame.Right+margin, 0, bounds.Width - activity.Frame.Right - 2*margin, 44)) {
				TextAlignment = UITextAlignment.Center,
				TextColor = isDark ? UIColor.FromWhiteAlpha (1-0.33f, 1) : UIColor.FromWhiteAlpha (0.33f, 1),
				BackgroundColor = UIColor.Clear,
			};

			AddSubviews (titleLabel, activity);
		}

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

            var source = new MySource(VM, TableView,
                GroupCell.Key, GroupCell.Key);
            TableView.RowHeight = 66;
            TableView.Source = source;

            var refreshControl = new MvxUIRefreshControl{Message = "Loading..."};
            this.RefreshControl = refreshControl;

            var set = this.CreateBindingSet<GroupsView, GroupsViewModel>();
            set.Bind(source).To(vm => vm.Groups);
            set.Bind(refreshControl).For(r => r.IsRefreshing).To(vm => vm.IsBusy);
            set.Bind(refreshControl).For(r => r.RefreshCommand).To(vm => vm.RefreshCommand);
            set.Bind(source).For(s => s.SelectionChangedCommand).To(vm => vm.GoToGroupCommand);
            set.Apply();

            TableView.ReloadData();
            var spinner = new UIActivityIndicatorView (UIActivityIndicatorViewStyle.Gray);
            spinner.Frame = new RectangleF (0, 0, 320, 66);
            //if isn't first time show spinner when busy
            TableView.TableFooterView = spinner;
            VM.IsBusyChanged = (busy) => {
                if(busy && VM.Groups.Count > 0)
                    spinner.StartAnimating();
                else
                    spinner.StopAnimating();
            };
        }

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

            _thread = new Thread(ThreadEntry);

            // Container for the controls
            _containerView = new UIView();
            _containerView.Frame = new RectangleF(0,-20,320,480);

            // The background loading image
            _imageView = new UIImageView();
            _imageView.Image = UIImage.FromFile("Default.png");
            _imageView.Frame = new RectangleF(0,0,320,480);
            _containerView.AddSubview(_imageView);

            // The pulser
            _activityView = new UIActivityIndicatorView(UIActivityIndicatorViewStyle.White);
            _activityView.Frame = new RectangleF(115,280,20,20);
            _containerView.AddSubview(_activityView);
            _activityView.StartAnimating();

            // Label saying wait
            _label = new UILabel();
            _label.Frame = new RectangleF(140,280,250,20);
            _label.Font = UIFont.SystemFontOfSize(14f);
            _label.BackgroundColor = UIColor.Clear;
            _label.TextColor = UIColor.White;
            _label.ShadowColor = UIColor.Black;
            _label.Text = "Loading...";
            _containerView.AddSubview(_label);

            View.AddSubview(_containerView);
        }

		public ProgressLabel (string text)
			: base (new RectangleF (0, 0, 200, 44))
		{
			BackgroundColor = UIColor.Clear;
			
			activity = new UIActivityIndicatorView (UIActivityIndicatorViewStyle.White) {
				Frame = new RectangleF (0, 11.5f, 21, 21),
				HidesWhenStopped = false,
				Hidden = false,
			};
			AddSubview (activity);
			
			var label = new UILabel () {
				Text = text,
				TextColor = UIColor.White,
				Font = UIFont.BoldSystemFontOfSize (20),
				BackgroundColor = UIColor.Clear,
				#if ! __UNIFIED__
				Frame = new RectangleF (25f, 0f, Frame.Width - 25, 44f),
				#else
				Frame = new RectangleF (25f, 0f, (float)(Frame.Width - 25), 44f),
				#endif
			};
			AddSubview (label);
			
			var f = Frame;
			f.Width = label.Frame.X + UIStringDrawing.StringSize (label.Text, label.Font).Width;
			Frame = f;
		}