DispatchGroup-Sample-1.swift

let group:DispatchGroup = DispatchGroup()
group.enter() // entryCount = 1 

iAmLongRunningFunc {
 group.leave() // entryCount = 0    
}
        
group.enter() // entryCount = 1
iAmLongRunningFunc {          
 group.leave() // entryCount = 0
}
        
group.notify(queue: DispatchQueue.main) {
  // if entryCount is 0 , then you get notified. 
  print("All tasks completed . Get rest")
}