C# UITextField.BecomeFirstResponder方法代码示例

		private void SetupUI ()
		{
			View.BackgroundColor = UIColor.White;

			verseReference = new UITextField {
				AutocapitalizationType = UITextAutocapitalizationType.Words,
				BackgroundColor = UIColor.Clear,
				BorderStyle = UITextBorderStyle.None,
				Font = FontConstants.SourceSansProBold (17),
				Frame = new RectangleF (0, 0, View.Bounds.Size.Width, 28f),
				Placeholder = "Verse"
			};
			verseReference.BecomeFirstResponder ();

			blackLine = new UIView {
				BackgroundColor = UIColor.FromPatternImage (UIImage.FromFile (Images.BlackLine)),
				Frame = new RectangleF (0, 28, View.Bounds.Width, 3f)
			};

			textViewDelegate = new ContentTextDelegate ();
			verseComments = new UITextView {
				Delegate = textViewDelegate,
				Font = FontConstants.SourceSansProBold (15),
				Frame = new RectangleF (0, 31, View.Bounds.Width, 145f),
				KeyboardAppearance = UIKeyboardAppearance.Default,
				Text = "Comments",
				TextAlignment = UITextAlignment.Left,
				TextColor = UIColor.LightGray
			};

			View.AddSubview (verseReference);
			View.AddSubview (blackLine);
			View.AddSubview (verseComments);
		}

 public static void DismissKeyboard(this UIView view)
 {
     var tv = new UITextField (new RectangleF(-100,-100,1,1));
     view.AddSubview (tv);
     tv.BecomeFirstResponder ();
     tv.ResignFirstResponder ();
     tv.RemoveFromSuperview ();
     tv.Dispose ();
 }

		private UITextField ComposeTextFieldControl(bool secureTextEntry)
		{
			UITextField textField = new UITextField (new System.Drawing.RectangleF(12f, 45f, 260f, 25f));
			textField.BackgroundColor = UIColor.White;
			textField.UserInteractionEnabled = true;
			textField.AutocorrectionType = UITextAutocorrectionType.No;
			textField.AutocapitalizationType = UITextAutocapitalizationType.None;
			textField.ReturnKeyType = UIReturnKeyType.Done;
			textField.SecureTextEntry = secureTextEntry;
			
			textField.Text = _initEditValue;
			textField.Placeholder = _placeHolderValue;
			textField.BecomeFirstResponder();
			return textField;
		}

        public override void LayoutSubviews()
        {
            // layout the stock UIAlertView control
            base.LayoutSubviews ();

            // build out the text field
            _tf = ComposeTextFieldControl(_secureTextEntry);

            // add the text field to the alert view
            this.AddSubview(_tf);

            // We can only force it to become a First Responder after it has been added to the MainView.
            _tf.BecomeFirstResponder();

            // shift the contents of the alert view around to accomodate the extra text field
            AdjustControlSize();
        }

        private void ActivateEditTextImpl()
        {
            currentActiveEditText = this;
            attachedTextField = textField;

            UpdateInputTypeImpl();
            attachedTextField.Text = text;
            attachedTextField.EditingChanged += TextFieldOnValueChanged;
            attachedTextField.ShouldChangeCharacters += ShouldChangeCharacters;
            attachedTextField.BecomeFirstResponder();
        }

        public void CloseModal()
        {
            if(closing || topModal == null)
                return;
            closing = true;
            NavigationItem.LeftBarButtonItem = null;

            var tb = new UITextField(new RectangleF(0,-40,40,40));
            if (topModal is UIViewController)
            {
                var vcv = (topModal as UIViewController).View;
                vcv.AddSubview(tb);
                tb.BecomeFirstResponder();
                tb.ResignFirstResponder();
                this.NavigationController.PopViewControllerAnimated (false);
                MainView.AddSubview (vcv);
                topModal = vcv;

            }
            var modal = topModal as UIView;

            modal.AddSubview(tb);
            tb.BecomeFirstResponder();
            tb.ResignFirstResponder();
            UIView.BeginAnimations ("closeModel");
            UIView.SetAnimationDuration (AnimationSpeed);
            UIView.SetAnimationCurve(UIViewAnimationCurve.EaseIn);
            UIView.SetAnimationDelegate (this);
            UIView.SetAnimationDidStopSelector (new Selector ("fadeOutDidFinish"));
            modal.Transform = CGAffineTransform.MakeScale (0.2f, 0.2f);
            modal.Alpha = 0.5f;
            UIView.CommitAnimations ();
        }

		public void ShowPicker()
		{
			if(PickerShown != null)
				PickerShown(this,null);
			LayoutSubviews ();
			pickerView.BringSubviewToFront(closeBtn);
			pickerVisible = true;
			var parentView = ViewForPicker ?? this.Superview;
			var parentFrame = parentView.Frame;
			//closeView = new TapableView(parentView.Bounds);
			//closeView.Tapped += delegate{
			//	HidePicker();	
			//};
	
			pickerView.Frame = pickerView.Frame.SetLocation(new PointF(0,parentFrame.Height));
			
			UIView.BeginAnimations("slidePickerIn");			
			UIView.SetAnimationDuration(0.3);
			UIView.SetAnimationDelegate(this);
			UIView.SetAnimationDidStopSelector (new Selector ("fadeInDidFinish"));
			//parentView.AddSubview(closeView);			
			parentView.AddSubview(pickerView);
			var tb = new UITextField(new RectangleF(0,-100,15,25));
			//closeView.AddSubview(tb);
			tb.BecomeFirstResponder();
			tb.ResignFirstResponder();
			tb.RemoveFromSuperview();
			
			
			pickerView.Frame = pickerView.Frame.SetLocation(new PointF(0,parentFrame.Height - pickerView.Frame.Height));
			UIView.CommitAnimations();				
		}

//.........这里部分代码省略.........

            Add(GravatarView = new UIImageView(new RectangleF(PointF.Empty, GravatarSize))
            {
                TranslatesAutoresizingMaskIntoConstraints = false,
                Image = UIImage.FromBundle("user-default-avatar"),
            });

            GravatarView.Layer.CornerRadius = GravatarSize.Width / 2;
            GravatarView.Layer.MasksToBounds = true;

            DisplayGravatar(xamarinAccountEmail);

            AddConstraint(NSLayoutConstraint.Create(
                GravatarView,
                NSLayoutAttribute.Top,
                NSLayoutRelation.Equal,
                this,
                NSLayoutAttribute.Top,
                1f, 90f
            ));

            AddConstraint(NSLayoutConstraint.Create(
                GravatarView,
                NSLayoutAttribute.CenterX,
                NSLayoutRelation.Equal,
                this,
                NSLayoutAttribute.CenterX,
                1f, 0
            ));

            AddConstantSizeConstraints(GravatarView, GravatarSize);

            Add(EmailField = new UITextField(new RectangleF(10, 10, 300, 30))
            {
                BorderStyle = UITextBorderStyle.RoundedRect,
                Text = xamarinAccountEmail,
                TranslatesAutoresizingMaskIntoConstraints = false,
                Delegate = new EmailFieldDelegate()
            });

            AddConstraint(NSLayoutConstraint.Create(
                EmailField,
                NSLayoutAttribute.Top,
                NSLayoutRelation.Equal,
                GravatarView,
                NSLayoutAttribute.Bottom,
                1f, 30f
            ));

            AddConstraint(NSLayoutConstraint.Create(
                EmailField,
                NSLayoutAttribute.CenterX,
                NSLayoutRelation.Equal,
                GravatarView,
                NSLayoutAttribute.CenterX,
                1f, 0
            ));

            var textSize = new NSString("hello").StringSize(UIFont.SystemFontOfSize(12f));

            AddConstantSizeConstraints(EmailField, new SizeF(260, textSize.Height + 16));

            Add(PasswordField = new UITextField(new RectangleF(10, 10, 300, 30))
            {
                BorderStyle = UITextBorderStyle.RoundedRect,
                SecureTextEntry = true,
                TranslatesAutoresizingMaskIntoConstraints = false,
                ReturnKeyType = UIReturnKeyType.Go,
                Placeholder = "Password"
            });

            AddConstraint(NSLayoutConstraint.Create(
                PasswordField,
                NSLayoutAttribute.Top,
                NSLayoutRelation.Equal,
                EmailField,
                NSLayoutAttribute.Bottom,
                1f, 10f
            ));

            AddConstraint(NSLayoutConstraint.Create(
                PasswordField,
                NSLayoutAttribute.CenterX,
                NSLayoutRelation.Equal,
                EmailField,
                NSLayoutAttribute.CenterX,
                1f, 0
            ));

            AddConstantSizeConstraints(PasswordField, new SizeF(260, textSize.Height + 16));

            PasswordField.ShouldReturn = field =>
            {
                field.ResignFirstResponder();
                UserDidLogin(this);
                return true;
            };

            PasswordField.BecomeFirstResponder();
        }

// Create user logout View
		public void setLogoutView(){

			logoutVIew.Frame = new CGRect (0.0f, 0.0f, 275, 200);
			logoutVIew.BackgroundColor = UIColor.White;

			titleName  = new UILabel (new CGRect(0, 10, logoutVIew.Bounds.Size.Width , 30));
			titleName.TextAlignment = UITextAlignment.Center;
			Console.WriteLine (titleName.Text);
			titleName.TextColor = UIColor.FromRGB(65, 64, 65);

			userEmail  = new UILabel (new CGRect(0, titleName.Bounds.Y + titleName.Bounds.Size.Height + 15, logoutVIew.Bounds.Size.Width , 25));
			userEmail.TextAlignment = UITextAlignment.Center;
			userEmail.TextColor = UIColor.FromRGB(26, 100, 51);
			//          UIFont EmailFont = new UIFont ();
			userEmail.MinimumFontSize = 8.0f;
			userEmail.AdjustsFontSizeToFitWidth = true;


			affView = new UIView(new CGRect(10, 80, logoutVIew.Bounds.Size.Width - 20 , 35));
			affView.BackgroundColor = UIColor.Clear;
			Appdata.setViewBorder (affView);
			downArrow = new UIImageView (new CGRect (affView.Frame.Size.Width - 35, 2, 30, 30));
			downArrow.Image = UIImage.FromFile ("down_arrow.png");

			affName  = new UITextField (new CGRect(0, 5, affView.Frame.Size.Width, 25));
			affName.Hidden = true;
			affiliateName = new UIButton(new CGRect(5, 5, affView.Frame.Size.Width - 35 , 25));
			affiliateName.SetTitle ("Taran Test Affiliate 11", UIControlState.Normal);
			affiliateName.SetTitleColor (UIColor.Black, UIControlState.Normal);
			affiliateName.TitleLabel.AdjustsFontSizeToFitWidth = true;
			affiliateName.TouchUpInside += (object sender, EventArgs e) => {
				affName.BecomeFirstResponder();
			};

			affView.AddSubview (affName);
			affView.AddSubview (affiliateName);
			affView.AddSubview (downArrow);

			editbutton = new UIButton (new CGRect (10, logoutVIew.Bounds.Size.Height-50, 100, 40));
			editbutton.SetTitle ("Edit", UIControlState.Normal);
			editbutton.BackgroundColor = UIColor.FromRGB(17,115,180);
			editbutton.SetTitleColor (UIColor.White, UIControlState.Normal);
			Appdata.setButtonBorder (editbutton);

			logoutButton = new UIButton (new CGRect (logoutVIew.Bounds.Size.Width-110, logoutVIew.Bounds.Size.Height-50, 100, 40));
			logoutButton.SetTitle ("Logout", UIControlState.Normal);
			logoutButton.BackgroundColor = Appdata.buttonBackgroundColor;
			logoutButton.SetTitleColor (UIColor.White, UIControlState.Normal);
			Appdata.setButtonBorder (logoutButton);


			logoutButton.TouchUpInside += (object sender, EventArgs e) => {
				affName.ResignFirstResponder ();
			};
			editbutton.TouchUpInside += (object sender, EventArgs e) => {
				Console.WriteLine("Edit button Tap");
				affName.ResignFirstResponder ();
			};

			logoutVIew.Layer.CornerRadius = 10.0f;

			logoutVIew.Layer.BorderWidth = 1.0f;
			logoutVIew.Layer.BorderColor =  UIColor.Gray.CGColor;
			logoutVIew.Layer.MasksToBounds =  true;
			logoutVIew.ClipsToBounds = true;

			//			loadAffiliatePickerView ();

			logoutVIew.AddSubview (titleName);
			logoutVIew.AddSubview (userEmail);
			logoutVIew.AddSubview (affView);
//			logoutVIew.AddSubview (affiliateName);
			logoutVIew.AddSubview (logoutButton);
			logoutVIew.AddSubview (editbutton);

			//			mainView.AddSubview (logoutVIew);

		}

        //        public override void ViewDidUnload ()
        //        {
        //            base.ViewDidUnload ();
        //            
        //            // Clear any references to subviews of the main view in order to
        //            // allow the Garbage Collector to collect them sooner.
        //            //
        //            // e.g. myOutlet.Dispose (); myOutlet = null;
        //            
        //            ReleaseDesignerOutlets ();
        //        }
        //        
        //        public override bool ShouldAutorotateToInterfaceOrientation (UIInterfaceOrientation toInterfaceOrientation)
        //        {
        //            // Return true for supported orientations
        //            return true;
        //        }
        public void BuildLoginScreen()
        {
            //create a login text box and password text box and button
            UIView[] arrItems = new UIView[6];

            UILabel lblLogin = new UILabel();
            lblLogin.Tag = 500;
            lblLogin.Frame = new RectangleF(120f,100f,100f,30f);
            lblLogin.Text = "Login Name:";
            arrItems[0] = lblLogin;

            UITextField txtLogin = new UITextField();
            txtLogin.BorderStyle = UITextBorderStyle.RoundedRect;
            txtLogin.Tag = 1000;
            txtLogin.Frame = new RectangleF(230f,100f,200f,30f);
            txtLogin.AutocapitalizationType = UITextAutocapitalizationType.None;
            arrItems[1] = txtLogin;

            UILabel lblPass = new UILabel();
            lblPass.Tag = 1500;
            lblPass.Frame = new RectangleF(120f,150f,100f,30f);
            lblPass.Text = "Password:";
            arrItems[2] = lblPass;

            UITextField txtPass = new UITextField();
            txtPass.BorderStyle = UITextBorderStyle.RoundedRect;
            txtPass.Tag = 2000;
            txtPass.Frame = new RectangleF(230f,150f,200f,30f);
            txtPass.AutocapitalizationType = UITextAutocapitalizationType.None;
            txtPass.SecureTextEntry = true;
            //txtPass.EnablesReturnKeyAutomatically = true;
            txtPass.AllTouchEvents += (sender, e) => {DetectEnterKey(sender,e);};
            arrItems[3] = txtPass;

            var btnLogin = UIButton.FromType(UIButtonType.RoundedRect);
            btnLogin.Frame = new RectangleF(200f,200f,100f,30f);
            btnLogin.SetTitle("Login", UIControlState.Normal);
            btnLogin.TouchUpInside += (sender,e) => {LogintoSCMS(sender, e);};
            arrItems[4] = btnLogin;

            UILabel hfLoggedIn = new UILabel();
            hfLoggedIn.Tag = 3000;
            hfLoggedIn.Frame = new RectangleF(120f,200f,100f,30f);
            hfLoggedIn.Hidden = true;
            arrItems[5] = hfLoggedIn;

            View.AddSubviews(arrItems);

            txtLogin.BecomeFirstResponder();
        }

		public override UITableViewCell GetCell(UITableView tv)
		{
			Value = FormatDate(DateValue);
			
			var cell = tv.DequeueReusableCell (CellKey);
			if (cell == null){
				cell = new UITableViewCell (UITableViewCellStyle.Default, CellKey);
				cell.SelectionStyle = UITableViewCellSelectionStyle.None;
			} else 
				RemoveTag (cell, 1);
			
			if (entry == null){
				SizeF size = ComputeEntryPosition (tv, cell);
				float yOffset = (cell.ContentView.Bounds.Height - size.Height) / 2 - 1;
				float width = cell.ContentView.Bounds.Width - size.Width - 5;
				
				entry = CreateTextField (new RectangleF (size.Width, yOffset, width, size.Height));
				dummyEntry = CreateTextField (new RectangleF (size.Width, yOffset, width, size.Height));
				entry.Alpha = 0;
				
				dummyEntry.ShouldBeginEditing = delegate {
					DateValue = (DateValue ?? DefaultDateValue);
					entry.BecomeFirstResponder();
					return (false);
				};
				dummyEntry.ShouldClear = delegate {
					DateValue = null;
					return (true);
				};
				dummyEntry.EditingChanged += delegate(object sender, EventArgs e) {
					if (string.IsNullOrEmpty((sender as UITextField).Text))
					{
						dummyEntry.Text = FormatDate(DateValue);
						dummyEntry.ClearButtonMode = UITextFieldViewMode.Never;
						entry.ResignFirstResponder();
					}
				};
				datePicker = CreatePicker();
				entry.InputView = datePicker;
			}
			if (becomeResponder){
				entry.BecomeFirstResponder ();
				becomeResponder = false;
			}
			cell.TextLabel.Text = Caption;
			cell.ContentView.AddSubview (entry);
			cell.ContentView.AddSubview (dummyEntry);

			return cell;
		}

 partial void EditingBegan(UITextField sender)
 {
     sender.BecomeFirstResponder();
 }

        string InitializePropsUI()
        {
            var help = Source as IHelpful;
            var helpText = "";

            var q = from t in SourceType.GetProperties ()
                where t.DeclaringType == SourceType && t.CanWrite
                select t;
            var props = q.ToArray ();

            var rows = new List<Row> ();

            foreach (var p in props) {

                var ignoreAttrs = p.GetCustomAttributes (typeof(IgnoreAttribute), true);
                if (ignoreAttrs.Length > 0)
                    continue;

                var isEmail = p.GetCustomAttributes (typeof(EmailInputAttribute), true).Length > 0;
                if (!isEmail && p.Name == "Email") {
                    isEmail = true;
                }
                var isChooseEmail = p.GetCustomAttributes (typeof(ChooseEmailInputAttribute), true).Length > 0;

                var title = Theme.GetTitle (p.Name);

                if (help != null) {
                    var h = help.HelpForProperty (p.Name);
                    if (h != "") {
                        helpText += title + " " + h + "\n";
                    }
                }

                var label = new UILabel { BackgroundColor = UIColor.Black, TextColor = Lcars.ComponentColors[LcarsComponentType.CriticalFunction], Text = title, TextAlignment = UITextAlignment.Right, BaselineAdjustment = UIBaselineAdjustment.AlignBaselines, Font = Theme.InputFont, AdjustsFontSizeToFitWidth = true };

                var row = new Row { Property = p };
                rows.Add (row);

                row.Label = label;
                UIKeyboardType kbd = UIKeyboardType.Default;
                if (isEmail || isChooseEmail) {
                    kbd = UIKeyboardType.EmailAddress;
                } else if (p.Name == "Url") {
                    kbd = UIKeyboardType.Url;
                } else if (p.PropertyType == typeof(int)) {
                    kbd = UIKeyboardType.NumberPad;
                }

                var init = p.GetValue (Source, null);

                var text = new UITextField { Placeholder = title, BackgroundColor = UIColor.Black, TextColor = UIColor.White, Font = Theme.InputFont, AdjustsFontSizeToFitWidth = false, AutocapitalizationType = UITextAutocapitalizationType.None, KeyboardType = kbd, Text = init != null ? init.ToString () : "" };
                row.Text = text;
                if (p.Name.ToLowerInvariant ().IndexOf ("password") >= 0) {
                    text.SecureTextEntry = true;
                    text.AutocorrectionType = UITextAutocorrectionType.No;
                }
                if (p.Name != "Search") {
                    text.AutocorrectionType = UITextAutocorrectionType.No;
                }
                if (text.Text.Length == 0 && !isChooseEmail) {
                    text.BecomeFirstResponder ();
                }
                label.Hidden = text.Text.Length == 0;
                if (isChooseEmail) {
                    text.EditingDidBegin += delegate {
                        try {

                            bool hasPeople = false;
                            using (var adds = new ABAddressBook ()) {
                                foreach (var pe in adds.GetPeople ()) {
                                    var es = pe.GetEmails ();
                                    if (es.Count > 0) {
                                        hasPeople = true;
                                        break;
                                    }
                                }
                            }

                            if (hasPeople) {
                                Sounds.PlayBeep ();
                                var em = new ChooseEmail ();
                                em.EmailSelected += emailAddress =>
                                {
                                    text.Text = emailAddress;
                                    UpdateUI ();
                                };
                                App.Inst.ShowDialog (em);
                                NSTimer.CreateScheduledTimer (TimeSpan.FromMilliseconds (30), delegate {
                                    try {
                                        HideKeyBoard (this);
                                    } catch (Exception err) {
                                        Log.Error (err);
                                    }
                                });
                            }
                        } catch (Exception error) {
                            Log.Error (error);
                        }
                    };
                }
//.........这里部分代码省略.........

        protected override void OnElementChanged(ElementChangedEventArgs<Entry> e)
        {
            base.OnElementChanged(e);
            //var native = (UITextField)this.Control;

            if (native == null)
            {
                source = e.NewElement as MyEntry;
                var control = (MyEntry)this.Element;
                native = this.Control as UITextField;

                // INIT defaults
                rules = source.Mask;
                FormatCharacters = source.FormatCharacters.ToCharArray();

                // Events
                //if (FormatCharacters != null && String.IsNullOrEmpty(source.Text) == false) {
                //	ApplyDefaultRule ();
                //}

                SetFont(control);
                SetTextAlignment(control);
                SetBorder(control);
                SetPlaceholderTextColor(control);

                ResizeHeight();

                native.ShouldChangeCharacters += new UITextFieldChange(delegate(UITextField textField, NSRange range, string replacementString)
                {
                    native.BecomeFirstResponder();
                    if (source.MaxLength > 0)
                    {
                        var newlength = source.Text.Length + replacementString.Length - range.Length;
                        return newlength <= source.MaxLength;
                    }

                    if (source.Locked)
                    {
                        return false;
                    }
                    if (source.Locked == false && source.Mask != null)
                    {
                        source.Delete = false;
                        source.SelectionStart = textField.GetOffsetFromPosition(textField.BeginningOfDocument, textField.SelectedTextRange.Start);
                        source.SelectionEnd = textField.GetOffsetFromPosition(textField.BeginningOfDocument, textField.SelectedTextRange.End);
                        source.TextLength = native.Text.Length;
                    }
                    if (source.Mask != null)
                    {
                        source.Delete = false;
                        if (replacementString == "")
                        {
                            source.Delete = true;
                        }
                        source.SelectionStart = textField.GetOffsetFromPosition(textField.BeginningOfDocument, textField.SelectedTextRange.Start);
                        source.SelectionEnd = textField.GetOffsetFromPosition(textField.BeginningOfDocument, textField.SelectedTextRange.End);
                        source.TextLength = native.Text.Length;
                    }

                    return true;
                });

                //SetNativeControl(native);
            }
        }