Swift Closures in for loop

You can use a DispatchGroup for this. It works like a counted semaphore. You can increase the count by calling enter and decrease the count by calling leave. You can schedule a closure to be executed when the count reaches 0 using notify:

let dispatchGroup = DispatchGroup()
var noOfTimes = 10
for i in 0..<noOfTimes {
    dispatchGroup.enter()  //  Enter the dispatch group
    someVariable.someClosure {
        result in
        // Process result
        ...
        dispatchGroup.leave() // Exit dispatch group
    }
}
dispatchGroup.notify(queue: DispatchQueue.main, execute: {
    print("All Done")
})