IOS development

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Across
  1. 3. ----------is a value associated with an instance of a type
  2. 7. The value of an optional will either be an instance of the specified type or ----------
  3. 8. -----------is assigned the value of a string literal
  4. 10. -------framework is used to develop the application’s user interface for iOS.
  5. 12. "there is a value, and it equals x" or "there isn't a value at all"
  6. 13. ----------is a term used in geometry; it refers to the smallest measure within which a given set of points.
Down
  1. 1. -------runtime error that stops the program before it gets into an unknown state.
  2. 2. -------Notifies the view controller that its view is about to be added to a view hierarchy
  3. 4. ----ways to achieve concurrency in iOS
  4. 5. ---------s called when the ViewController has loaded its view hierarchy into memory
  5. 6. -----verifying if the Optional value is nil or not, and then it performs a task only if it's not nil
  6. 9. iOS supports---------framework.
  7. 11. ------is a Application development environments for iOS