What I learned in Swift

by Donna McCulloch

[whatilearnedinswift]

Enumerations can be used instead of “Magic Strings” in Swift. One good use is comparisons of segue identifiers. 

[whatilearnedinswift]

Swift 1.2 got rid of the required, parameterless initialiser of UIViewController. No longer can we call UIViewController()

[whatilearnedinswift]

Swift 1.2 and Xcode 6.3 beta - Swift Blog

Swift 1.2 includes improvements to the language, this includes breaking changes. This post documents the main highlights of what’s changed. 

Topics covered: as, swift enums, let, if let, sets

To migrate Swift code to use Swift 1.2 a handy migrator tool can be found in Xcode at Edit > Convert > To Latest Swift Syntax...

For in depth documentation of all the changes with Xcode 6.3 see the release notes.

For a more in depth view of the highlights Ray Wenderlich also goes into a bit more depth.

[whatilearnedinswift]

Increasing Performance by Reducing Dynamic Dispatch - Swift Blog

It turns out that being open ended decreases performance. See how in Swift performance can be improved by specifying final / private / Whole Module Optimization

Check out here how to turn on Whole Module Optimization in Xcode 6.3