They aren't so similar. Feature-wise, Swift is much closer to Kotlin, which is (on purpose) significantly simpler than Scala.
Also if you're using Scala, there's a huge ecosystem of libraries and frameworks that just doesn't exist in Swift. If you want native compilation, just wait for http://www.scala-native.org/
Also if you're using Scala, there's a huge ecosystem of libraries and frameworks that just doesn't exist in Swift. If you want native compilation, just wait for http://www.scala-native.org/