Book Image

Xamarin Blueprints

By : Michael Williams
Book Image

Xamarin Blueprints

By: Michael Williams

Overview of this book

Do you want to create powerful, efficient, and independent apps from scratch that will leverage the Xamarin framework and code with C#? Well, look no further; you’ve come to the right place! This is a learn-as-you-build practical guide to building eight full-fledged applications using Xamarin.Forms, Xamarin Android, and Xamarin iOS. Each chapter includes a project, takes you through the process of building applications (such as a gallery Application, a text-to-speech service app, a GPS locator app, and a stock market app), and will show you how to deploy the application’s source code to a Google Cloud Source Repository. Other practical projects include a chat and a media-editing app, as well as other examples fit to adorn any developer’s utility belt. In the course of building applications, this book will teach you how to design and prototype professional-grade applications implementing performance and security considerations.
Table of Contents (14 chapters)
Xamarin Blueprints
Credits
About the Author
About the Reviewer
www.PacktPub.com
Preface

Building the CameraPage


Now for the final page of the solution, the CameraPage introduces some new tricks to handle orientation changes with Grid positions. We will be using Converters to change rows and columns on the Grid to reposition elements when we change orientation.

We are going to start with adding some converters to the project. Let's create a new folder in the Camera project, add a new file called NotConverter.cs, and implement the following:

public class NotConverter : IValueConverter 
    { 
        #region Public Methods 
 
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) 
        { 
            var b = value as bool?; 
 
            if (b != null) 
            { 
                return !b; 
            } 
 
            return value; 
        } 
 
        public object ConvertBack(object value, Type targetType, object parameter...