Book Image

Swift Essentials - Second Edition

By : Alex Blewitt
Book Image

Swift Essentials - Second Edition

By: Alex Blewitt

Overview of this book

Swift was considered one of the biggest innovations last year, and certainly with Swift 2 announced at WWDC in 2015, this segment of the developer space will continue to be hot and dominating. This is a fast-paced guide to provide an overview of Swift programming and then walks you through in detail how to write iOS applications. Progress through chapters on custom views, networking, parsing and build a complete application as a Git repository, all by using Swift as the core language
Table of Contents (17 chapters)
Swift Essentials Second Edition
About the Author
About the Reviewer

Open source Swift

Apple released Swift as an open source project in December 2015, hosted at and related repositories. Information about the open source version of Swift is available from the site. The open-source version of Swift is similar from a runtime perspective on both Linux and OS X; however, the set of libraries available differ between the two platforms.

For example, the Objective-C runtime was not present in the initial release of Swift for Linux; as a result, several methods that are delegated to Objective-C implementations are not available. "hello".hasPrefix("he") compiles and runs successfully on OS X and iOS but is a compile error in the first Swift release for Linux. In addition to missing functions, there is also a different set of modules (frameworks) between the two platforms. The base functionality on OS X and iOS is provided by the Darwin module, but on Linux, the base functionality is provided by the Glibc module. The Foundation module, which provides many of the data types that are outside of the base-collections library, is implemented in Objective-C on OS X and iOS, but on Linux, it is a clean-room reimplementation in Swift. As Swift on Linux evolves, more of this functionality will be filled in, but it is worth testing on both OS X and Linux specifically if cross platform functionality is required.

Finally, although the Swift language and core libraries have been open sourced, this does not apply to the iOS libraries or other functionality in Xcode. As a result, it is not possible to compile iOS or OS X applications from Linux, and building iOS applications and editing user interfaces is something that must be done in Xcode on OS X.