Signature Capture Library for Xamarin.iOS (MonoTouch)

public override void ViewDidLoad()
{
   var signature = new UISignatureView(new RectangeF(0, 40, UIScreen.MainScreen.ApplicationFrame.Width, 200));
   this.View.AddSubview(signature);
}

StrokeWidth - Allows the setting of the width of the signature line. Defaults to 2
StrokeColor - Allows the setting of the color of the signature line. Defaults to Black
TextColor - Allows the setting of the text color of the UI elements. Defaults to Black
ViewBackgroundColor - Allows the setting of the background color of the signature capture pad. Same as setting BackgroundColor on the view. Defaults to White
ShowShadow - Determines whether to show a shadow around the signature view. Defaults to true
ShadowColor - Allows the setting of the shadow color. Defaults to Black

The MIT License (MIT)

Copyright (c) 2013 Ryan Alford

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.