iOS Newsletter: Crossword Puzzle #1

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Across
  1. 2. A low-level API for managing concurrent operations
  2. 4. Adding a question mark after a property's type makes that property ___
  3. 6. The IDE required to develop native iOS applications
  4. 8. Swift classes are ___ types
  5. 9. The Swift keyword used to declare a constant, immutable variable
Down
  1. 1. Another name for the M in MVC (hint: it's not Model)
  2. 2. The Swift statement used to transfer control out of the scope when one or more conditions are not met
  3. 3. Swift structs are ___ types
  4. 5. What the P stands for in plist
  5. 7. A visual connector in a storyboard that defines the transition between two view controllers