What are the changes in Swift 2.0?

Paul Hudson    September 20th 2017    @twostraws

Swift 2.0 introduced a lot of major language changes. You can read my full article explaining the changes with code examples by clicking here, but here are the highlights:

• Checked exceptions using try/catch
• Automatically synthesized headers
• The guard keyword to check input while unwrapping optionals
• Measuring strings is now done using characters.count (Note: this was later un-done in Swift 4.)
• Delayed code execution using the defer keyword
• You now get mutability warnings if you declare variables that never get changed
• API availability checking is now built right in
• The performSelector() family of functions is now available

Available from iOS 7.0

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