Book Image

Cross-platform UI Development with Xamarin.Forms

By : Paul Johnson
Book Image

Cross-platform UI Development with Xamarin.Forms

By: Paul Johnson

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Cross-platform UI Development with Xamarin.Forms
Paul Johnson
Aug, 2015 | 330 pages
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Table of Contents (22 chapters)
Cross-platform UI Development with Xamarin.Forms
Cross-platform UI Development with Xamarin.Forms
Credits
Credits
About the Author
About the Author
Acknowledgments
Acknowledgments
About the Reviewers
About the Reviewers
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
In the Beginning…
In the Beginning…
Application planning
Summary
2
Let's Get the Party Started
Let's Get the Party Started
What is Xamarin Forms?
Instantiating Xamarin Forms within an app
Dependency injection
Customizing the UI
Gestures, maps, and WebViews
Summary
3
Making It Look Pretty and Logging In
Making It Look Pretty and Logging In
Introducing the standard UI login experience
Summary
4
Making Your Application Portable
Making Your Application Portable
PCLs – the pros and cons
Writing your PCL library
Other options for PCL
Summary
5
Data, Generics, and Making Sense of Information
Data, Generics, and Making Sense of Information
A history lesson
.NET generics
LINQ me up baby – yeah!
The database helper class
Too much information!
Summary
6
A View to a Kill
A View to a Kill
Touch-a-touch-a-touch me
Summary
References
7
Connect Me to Your Other Services
Connect Me to Your Other Services
Let's take a REST
The Windows Communication Framework
Summary
References
8
What a Bind!
What a Bind!
A bit of a history lesson
Binding the mobile arena
Summary
9
Addressing the Issue
Addressing the Issue
Addressing issues
Summary
10
This is the World Calling…
This is the World Calling…
Using GPS and push notifications
Summary
11
A Portable Settings Class
A Portable Settings Class
The native platform storage
Constructing a persistent and cross-platform settings system
Is there an alternative?
Summary
12
Xamarin Forms Labs
Xamarin Forms Labs
What is Xamarin Forms Labs?
Summary
13
Social Media into the Mix
Social Media into the Mix
Connect me up, Scotty
Setting up the event system and interface
Setting up your Android code
Setting up iOS
Setting up Windows Phone
Adding social media to your app
OAuth1 for Twitter
Using OAuth2
The user interface
Summary
References
14
Bringing It All Together
Bringing It All Together
Setting up Azure
Setting up the application
The Azure Storage
The messenger application
And that's it!
Summary
Index
Index

Gestures, maps, and WebViews

Gestures, maps, and WebViews are very commonly used user-interface facilities. While they are all in Xamarin Forms, we will see that they are not as extensive as if they were native versions.

Gestures

All mobile devices have some form of a sweep system. The iOS is especially rich when it comes to having a multi-touch user interface. As with everything to do with Xamarin.Forms, it only covers the basic type of touch, essentially the only one supported on all platforms.

Note

Code for the following is given in Chapter2/Gestures.

Gestures are not enabled on all types of gadgets (for example, gestures are not enabled for dragging pins on a map). This is because only tap detection is currently supported.

Adding a gesture recognizer

In this example, we'll add a gesture recognizer to a label. Labels usually don't have a click event.

  1. Let's create the label:

    var count = 0;

var label = new Label()
{
  Text = string.Format("You have clicked me {0} times", count),
  TextColor = Color...
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