UIConversationBubbleView

    using CoreGraphics;
    using Foundation;
    using Common.Utilities;
    using System;
    using System.Drawing;
    using UIKit;

    namespace Messenger.iOS.Controls.ConversationBubble
    {
        [Register("UIConversationBubbleView")]
        class UIConversationBubbleView : UIView
        {
            #region Layout Variables
            // Defining colours and margins
            ...
            #endregion

            #region iOS Properties
            private static NSString classId = new NSString("UIConversationBubbleView");
            public static NSString ClassId { get { return classId; } }
            #endregion

            #region Data Properties
            private string mMessageBody;
            public string MessageBody { get { return mMessageBody;  } set { mMessageBody = value; SetNeedsDisplay(); } }

            private DateTime mTime;
            public DateTime Time { get { return mTime; } set { mTime = value; SetNeedsDisplay(); } }

            public string mDirection;
            public string Direction { get { return mDirection; } set { mDirection = value; SetNeedsDisplay(); } }
            #endregion

            #region Content Views
            private UILabel mDirectionLabel;
            private UILabel mMessageBodyLabel;
            private UILabel mTimeLabel;
            #endregion

            #region Initialization
            public UIConversationBubbleView(string body, DateTime time, string direction)
            {
                TranslatesAutoresizingMaskIntoConstraints = false;

                mMessageBody = body;
                mTime = time;
                mDirection = direction;

                InitializeSubviews();
            }

            private void InitializeSubviews() {
                // init message direction label
                mDirectionLabel = new UILabel();
                AddSubview(mDirectionLabel);

                mDirectionLabel.TranslatesAutoresizingMaskIntoConstraints = false;
                mDirectionLabel.TextAlignment = UITextAlignment.Left;
                mDirectionLabel.TextColor = UIColor.FromCGColor(Direction == "MO" ? MOColor : MTColor);
                mDirectionLabel.LayoutMargins = new UIEdgeInsets(0, 0, 0, 0);

                // init message body label
                mMessageBodyLabel = new UILabel();
                AddSubview(mMessageBodyLabel);

                mMessageBodyLabel.TranslatesAutoresizingMaskIntoConstraints = false;
                mMessageBodyLabel.LineBreakMode = UILineBreakMode.WordWrap;
                mMessageBodyLabel.TextColor = UIColor.Black;
                mMessageBodyLabel.Lines = 0;
                mMessageBodyLabel.LayoutMargins = new UIEdgeInsets(0, 0, 0, 0);

                // init the timestamp label
                mTimeLabel = new UILabel();
                AddSubview(mTimeLabel);

                mTimeLabel.TranslatesAutoresizingMaskIntoConstraints = false;
                mTimeLabel.TextColor = UIColor.LightGray;
                mTimeLabel.TextAlignment = UITextAlignment.Left;
                mTimeLabel.LayoutMargins = new UIEdgeInsets(0, 0, 0, 0);

                // Set the Text values
                mDirectionLabel.Text = Direction;
                mMessageBodyLabel.Text = MessageBody;
                mTimeLabel.Text = GetDateString(Time);

                AddSubviewConstraints();

                SetNeedsDisplay();
                LayoutSubviews();
            }

            private void AddSubviewConstraints() {
                var leftConstraint = (mDirection == "MO") ? BUBBLE_INDENT_MARGIN : BUBBLE_MARGIN;
                var rightConstraint = (mDirection == "MO") ? BUBBLE_MARGIN : BUBBLE_INDENT_MARGIN;

                // Parent view must stretch to contain subviews.
                //AddConstraint(NSLayoutConstraint.Create(this, NSLayoutAttribute.Top, NSLayoutRelation.Equal, mDirectionLabel, NSLayoutAttribute.Top, 1, 0));
                AddConstraint(NSLayoutConstraint.Create(this, NSLayoutAttribute.Bottom, NSLayoutRelation.Equal, mTimeLabel, NSLayoutAttribute.Bottom, 1, BUBBLE_MARGIN));

                AddConstraint(NSLayoutConstraint.Create(this, NSLayoutAttribute.Width, NSLayoutRelation.GreaterThanOrEqual, mDirectionLabel, NSLayoutAttribute.Width, 1, BUBBLE_WIDTH_OFFSET));
                //AddConstraint(NSLayoutConstraint.Create(this, NSLayoutAttribute.Height, NSLayoutRelation.GreaterThanOrEqual, mMessageBodyLabel, NSLayoutAttribute.Height, 1, BUBBLE_MARGIN * 2));

                // Direction Label is indented if MO (This affects the other labels because they have constraints that depend on this label.) and set to the width minus the indent and margins.
                AddConstraint(NSLayoutConstraint.Create(mDirectionLabel, NSLayoutAttribute.Top, NSLayoutRelation.Equal, this, NSLayoutAttribute.Top, 1, BUBBLE_MARGIN));
                AddConstraint(NSLayoutConstraint.Create(mDirectionLabel, NSLayoutAttribute.Left, NSLayoutRelation.Equal, this, NSLayoutAttribute.Left, 1, leftConstraint));
                AddConstraint(NSLayoutConstraint.Create(mDirectionLabel, NSLayoutAttribute.Right, NSLayoutRelation.Equal, this, NSLayoutAttribute.Right, 1, rightConstraint));

                //AddConstraint(NSLayoutConstraint.Create(mDirectionLabel, NSLayoutAttribute.Height, NSLayoutRelation.GreaterThanOrEqual, 1, mDirectionLabel.Font.LineHeight));

                // Body label is below the direction label, and has the same width and left position.
                AddConstraint(NSLayoutConstraint.Create(mMessageBodyLabel, NSLayoutAttribute.Top, NSLayoutRelation.Equal, mDirectionLabel, NSLayoutAttribute.Bottom, 1, 0));
                AddConstraint(NSLayoutConstraint.Create(mMessageBodyLabel, NSLayoutAttribute.Left, NSLayoutRelation.Equal, this, NSLayoutAttribute.Left, 1, leftConstraint));
                AddConstraint(NSLayoutConstraint.Create(mMessageBodyLabel, NSLayoutAttribute.Right, NSLayoutRelation.Equal, this, NSLayoutAttribute.Right, 1, rightConstraint));

                //AddConstraint(NSLayoutConstraint.Create(mMessageBodyLabel, NSLayoutAttribute.Width, NSLayoutRelation.Equal, this, NSLayoutAttribute.Width, 1, -BUBBLE_WIDTH_OFFSET));
                //AddConstraint(NSLayoutConstraint.Create(mMessageBodyLabel, NSLayoutAttribute.Height, NSLayoutRelation.GreaterThanOrEqual, 1, mMessageBodyLabel.Font.LineHeight));

                // Time label is below the message body, and has the same width and left position.
                AddConstraint(NSLayoutConstraint.Create(mTimeLabel, NSLayoutAttribute.Top, NSLayoutRelation.Equal, mMessageBodyLabel, NSLayoutAttribute.Bottom, 1, 0));
                AddConstraint(NSLayoutConstraint.Create(mTimeLabel, NSLayoutAttribute.Left, NSLayoutRelation.Equal, this, NSLayoutAttribute.Left, 1, leftConstraint));
                AddConstraint(NSLayoutConstraint.Create(mTimeLabel, NSLayoutAttribute.Right, NSLayoutRelation.Equal, this, NSLayoutAttribute.Right, 1, rightConstraint));

                //AddConstraint(NSLayoutConstraint.Create(mTimeLabel, NSLayoutAttribute.Height, NSLayoutRelation.GreaterThanOrEqual, 1, mTimeLabel.Font.LineHeight));
            }
            #endregion

            # region UIView overrides
            public override void LayoutSubviews()
            {
                mMessageBodyLabel.PreferredMaxLayoutWidth = Bounds.Size.Width - BUBBLE_WIDTH_OFFSET;
                base.LayoutSubviews();
            }
            #endregion

            #region Helpers
            private String GetDateString(DateTime date)
            { ... }
            #endregion
        }
    }