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Both. You have to know both languages to develop iOS apps in 2016.

• GoldenMonkey 11y ago
  No you don't. You can make all your apps in Objective-C.
  • deleted 11y ago
    [deleted]
  • autoreleasepool 11y ago
    If you want to be technically correct, you can make all your apps exclusively in Swift too. The fact is most large projects are already using both. The trend for new code is to be written in Swift. At the very least, your need to be able to reason about both languages. Refusing to learn one of them is a disservice to yourself as an iOS dev IMO. Denying that would be silly. If you haven't taken a look at Swift, there is no better time than now to start.