NEW! Pre-order my latest book, Testing Swift! >>

What are the changes in Swift 1.2?

Paul Hudson       @twostraws

Swift 1.2 was an interim release that fixed some early confusions and annoyances in the language. Its changes weren't big, but they did help clean up and clarify Swift, and helped tide us all over until the release of Swift 2.

The important changes are:

  • You can now check and unwrap multiple optionals using if/let rather than create a so-called "pyramid of doom" with nested statements.
  • Many Objective-C types that were being passed around now had correct nullability values set. This was done by modifying Objective-C then having many people scour through existing Apple code to add new annotations.
  • Downcasting (a typecast from a higher type in your class hierarchy to a lower type) is now done using as! and as? to mark forced downcasting and optional downcasting respectively.
  • Swift strings, arrays and dictionaries now no longer automatically typecast to NSString, NSArray and NSDictionary.
  • A new Set data type was introduced to handle arrays where each value can appear only once.
  • Constants can now be declared without a value, as long as they are provided with a value before they are used.
  • Incremental build support was added, which makes it more efficient to build larger Swift projects.

Available from iOS 7.0

Did this solution work for you? Please pass it on!

Other people are reading…

About the Swift Knowledge Base

This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.

Upgrade to the premium experience

Get all 40 projects in PDF and ePub, plus exclusive content that will take your Swift learning to the next level – buy the Hacking with Swift book today!

MASTER SWIFT NOW
Buy Testing Swift Buy Practical iOS 12 Buy Pro Swift Buy Swift Design Patterns Buy Swift Coding Challenges Buy Server-Side Swift (Vapor Edition) Buy Server-Side Swift (Kitura Edition) Buy Hacking with macOS Buy Advanced iOS Volume One Buy Advanced iOS Volume Two Buy Hacking with watchOS Buy Hacking with tvOS Buy Hacking with Swift Buy Dive Into SpriteKit Buy Swift in Sixty Seconds Buy Objective-C for Swift Developers Buy Beyond Code

Was this page useful? Let me know!

Click here to visit the Hacking with Swift store >>