Swift, dispatch_group_wait not waiting

Question

I am trying to use grand central dispatch to wait for files to finish download before continuing. This question is a spin-off from this one: Swift (iOS), waiting for all im

Answer 1

In Swift 3...

let dispatchGroup = DispatchGroup()

dispatchGroup.enter()
// do something, including background threads

dispatchGroup.leave()

dispatchGroup.notify(queue: DispatchQueue.main) {
    // completion code
}

https://developer.apple.com/reference/dispatch/dispatchgroup