Book Image

iOS Development using MonoTouch Cookbook

By : Dimitris Tavlikos
Book Image

iOS Development using MonoTouch Cookbook

By: Dimitris Tavlikos

Overview of this book

<p>MonoTouch brings the amazing revenue opportunities of Apple’s billion dollar app store to C# and .NET developers. <br /><br />This cookbook leaves no stone unturned, providing you with practical recipes covering user interfaces, data management, multimedia , web services, and localization, right through to application deployment on the app store.<br /><br />Whatever the area of MonoTouch iOS development you need to know about, you will find a recipe for it in this cookbook. Minimum theory and maximum practical action defines this book. It is jam packed with recipes for interacting with the device hardware, like the GPS, compass and the accelerometer. Recipes for those all important real world issues such as designing the UI with the integrated designer introduced with Xcode 4. It is the essential cookbook for C# and .NET developers wanting to be part of the exciting and lucrative world of iOS development.</p>

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iOS Development using MonoTouch Cookbook
Dimitris Tavlikos
Dec, 2011 | 384 pages
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Table of Contents (22 chapters)
iOS Development Using MonoTouch Cookbook
iOS Development Using MonoTouch Cookbook
Credits
Credits
About the Author
About the Author
About the Reviewers
About the Reviewers
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
Development Tools
Development Tools
Introduction
Installing pre-requisites
Creating an iPhone project with MonoDevelop
Interface builder
Creating the UI
Accessing the UI with outlets
Adding actions
Compiling
Debugging our application
2
User Interface: Views
User Interface: Views
Introduction
Adding and customizing views
Receiving user input with buttons
Using labels to display text
Displaying images
Displaying and editing text
Using the keyboard
Displaying progress
Displaying content larger than the screen
Navigating through content divided into pages
Displaying a toolbar
Creating a custom view
3
User Interface: View Controllers
User Interface: View Controllers
Introduction
Loading a view with a view controller
Navigating through different view controllers
Providing controllers in tabs
Creating a table controller
Modal view controllers
Creating a custom view controller
Using view controllers efficiently
Combining different view controllers
iPad view controllers
Creating a user interface for different devices
4
Data Management
Data Management
Introduction
Creating files
Creating an SQLite database
Inserting and updating data
Querying an SQLite database
Using an already existing SQLite database
Storing data with serialization
Storing data with XML
Managing XML data with LINQ to XML
5
Displaying Data
Displaying Data
Introduction
Providing lists
Displaying data in a table
Customizing rows
Editing a table: deleting rows
Editing a table: inserting rows
Table indexing
Searching through the data
Creating a simple web browser
Displaying local content
Displaying formatted text
Displaying documents
6
Web Services
Web Services
Introduction
Consuming web services
Invoking web services
Consuming WCF services
Reading JSON data
7
Multimedia Resources
Multimedia Resources
Introduction
Selecting images and videos
Capturing media with the camera
Playing video
Playing music and sounds
Recording with the microphone
Managing multiple album items directly
8
Integrating iOS Features
Integrating iOS Features
Introduction
Starting phone calls
Sending text messages and e-mails
Using text messaging in our application
Using e-mail messaging in our application
Managing the address book
Displaying contacts
Managing the calendar
9
Interacting with Device Hardware
Interacting with Device Hardware
Introduction
Detecting device orientation
Adjusting UI orientation
Proximity sensor
Retrieving battery information
Handling motion events
Handling touch events
Recognizing gestures
Custom gestures
Using the accelerometer
Using the gyroscope
10
Location Services and Maps
Location Services and Maps
Introduction
Determining location
Determining heading
Using region monitoring
Using significant-change location service
Location services in the background
Displaying maps
Geocoding
Adding map annotations
Adding map overlays
11
Graphics and Animation
Graphics and Animation
Introduction
Animating Views
Transforming views
Animation with images
Animating layers
Drawing lines and curves
Drawing shapes
Drawing text
A simple drawing application
Creating an image context
12
Multitasking
Multitasking
Introduction
Detecting application states
Receiving notifications for application states
Running code in the background
Playing audio in the background
Network connectivity maintenance
13
Localization
Localization
Introduction
Creating an application for different languages
Localizable resources
Regional formatting
14
Deploying
Deploying
Introduction
Creating profiles
Creating an ad-hoc distribution bundle
Preparing an application for the App Store
Submitting to the App Store
15
iOS 5 Features
iOS 5 Features
Introduction
Reproducing the page curl effect
Styling views
Twitter integration
Working with the split keyboard
Index
Index

Creating an image context

In this recipe, we will expand the finger drawing application that we created previously by providing the user with the feature of saving the created drawings.

Getting ready

Create a new project in MonoDevelop, and name it ImageContextApp. Add the CanvasView class that we created in the previous task to the project.

How to do it...

  1. Add two buttons on the view of MainController. One will be used for saving the image and the other for clearing the current drawing.

  2. Add the following methods in the CanvasView class:

    public UIImage GetDrawingImage(){
  UIImage toReturn = null;
  UIGraphics.BeginImageContext(this.Bounds.Size);
  using (CGContext context = UIGraphics.GetCurrentContext()){
    context.SetStrokeColorWithColor(UIColor.Blue.CGColor);
    context.SetLineWidth(10f);
    context.SetLineJoin(CGLineJoin.Round);
    context.SetLineCap(CGLineCap.Round);
    context.AddPath(this.drawPath);
    context.DrawPath(CGPathDrawingMode.Stroke);
    toReturn = UIGraphics.GetImageFromCurrentImageContext...
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