Book Image

RubyMotion iOS Development Essentials

By : Abhishek Nalwaya, Akshat Paul
Book Image

RubyMotion iOS Development Essentials

By: Abhishek Nalwaya, Akshat Paul

Overview of this book

RubyMotion is a revolutionary toolchain for iOS app development. With RubyMotion, you can quickly develop and test native iOS apps for the iPhone and iPad, combining the expressiveness and simplicity of Ruby with the power of the iOS SDK. "RubyMotion iOS Development Essentials" is a hands-on guide for developing iOS apps using RubyMotion. With RubyMotion, you can eliminate the complexity and confusion associated with the development of iOS applications using Objective-C. We'll begin from scratch. Starting by installing RubyMotion, we'll build ourselves up to developing an app that uses the various device capabilities iOS has to offer. What's more, we'll even learn how to launch your app on the App Store! We'll also learn to use iOS SDK classes to create application views. Discover how to use the camera, geolocation, gestures, and other device capabilities to create engaging, interactive apps. We'll develop stunning user interfaces faster with the XCode interface builder and make web apps by using WebView. We'll then augment applications with RubyMotion gems, doing more by writing less code and learn how to write test cases for RubyMotion projects. Finally, we'll understand the app submission process to push your app to Apple's App Store With "RubyMotion iOS Development Essentials", we will learn how to create iOS apps with ease. At the end of each chapter we will have a tangible and running app, which utilizes the concepts we have learnt in that chapter.
Table of Contents (19 chapters)
RubyMotion iOS Development Essentials
About the Authors
About the Reviewers

Gestures – non-verbal communication

Gestures are a big part of iOS applications. For example, when we pinch on a picture, it gets zoomed, or when we rotate our device, the orientation of the picture changes. Detecting gestures in your application is very easy with the built-in UIGestureRecognizer classes.

There are a few subclasses of UIGestureRecognizer, each designed to detect a specific type of gesture. You can handle the most commonly used gestures with the following subclasses:

  • UITapGestureRecognizer: This class detects the tapping gesture made on the device screen by the user.

  • UIPinchGestureRecognizer: This class detects the pinching gesture made on screen by the user. This motion is usually used to zoom in or out of a view or to change the size of a visual component.

  • UIPanGestureRecognizer: This class detects the dragging or panning gesture that the user makes.

  • UISwipeGestureRecognizer: This class detects when the user makes a swiping gesture across the screen. Instances of this class...