How to Migrate to Swift 4?

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How to Migrate to Swift 4

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 Recently Apple released Swift 4 with several new features and enhancements. Despite being compatible with Swift 3 Swift 4 comes with several new and improved APIs.  For instance Swift 4 requires developers to use redesigned APIs for strings dictionary set archival and serialization. Also it enables developers to create multi-string literals using simple syntax.  Swift 4 further introduces a new codable protocol that makes it easier for programmers to serialize and deserialize custom data types while writing complex code.

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 At the same time Xcode 9 adds a number of new functionalities to the latest version of Swift. The new language features and improved APIs will persuade many developers to migrate their apps from Swift 3 to Swift 4.  Apple keeps the Swift 3 to Swift 4 migration process simple and fast.  Also it allows developers to migrate their apps to Swift 4 smoothly by taking advantage of the migration tool provided by Xcode 9.  But the developers still need to keep in mind some important factors when they migrate to Swift 4.

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Important Factors a Developer Must Know to Migrate to Swift 4 Smoothly Know the New Features and SDK Changes  When a developer decides to migrate to swift 4 it becomes essential for him to know the new language features and SDK changes. For instance he has to adopt major SDK changes like converting string constants into Swift enumeration cases and moving global constants into static type properties.  Likewise he needs to understand various aspects of new and improved APIs for strings dictionary set archival and serialization.

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Choose the Right Language Mode  Swift 4 is fully compatible with Swift 3. But Swift 4 compiler supports two language modes – Swift 3.2 and Sift 4.0. A developer can opt for Swift 4.0 mode to take advantage of all new language features and APIs provided by the latest version of the programming language after migrating to Swift 4.  On the other hand Swift 3.2 mode makes the compiler accept the existing source code of an app built with earlier version of the compiler. Also it will not update the APIs used by the app to maintain source code compatibility. But the mode still allows developers to avail the features of Swift 4.

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Understand the Migration Process  As noted earlier Swift 4 compiler supports two distinct language modes.  A developer can easily accelerate the migration process by building the existing project in Swift 3.2.  If the app is written in earlier versions of Swift the developer has to rebuild the project in Swift 3.2 successfully to keep the migration process smooth.  However there are always chances that a developer has to manage a number of changes and address a number of issues while migrating the project to Swift 3.2 from earlier versions of the programming language.

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