// usual usage
UIApplication.sharedApplication().networkActivityIndicatorVisible = true
UIApplication.sharedApplication().networkActivityIndicatorVisible = false

class SomeClass {
  var connectionCount: Int

  init() {
    connectionCount = 0
  }

  func getData() {
    doConnection1()
    doConnection2()
  }

  func doConnection1() {
    UIApplication.sharedApplication().networkActivityIndicatorVisible = true
    connectionCount += 1
    // some async connection
  }

  func endConnection1() {
    if connectionCount == 0 {
      UIApplication.sharedApplication().networkActivityIndicatorVisible = false
    }
  }

  func doConnection2() {
    UIApplication.sharedApplication().networkActivityIndicatorVisible = true
    connectionCount += 1
    // some async connection
  }

  func endConnection2() {
    if connectionCount == 0 {
      UIApplication.sharedApplication().networkActivityIndicatorVisible = false
    }
  }
}

// usual usage
NetworkActivityIndicator.shared().start()
NetworkActivityIndicator.shared().end()

class SomeClass {
  init() {
  }

  func getData() {
    doConnection1()
    doConnection2()
  }

  func doConnection1() {
    NetworkActivityIndicator.shared().start()
    // some async connection
  }

  func endConnection1() {
    NetworkActivityIndicator.shared().end()
    // if `activeCount` is above 0, remain indicator visible.
  }

  func doConnection2() {
    NetworkActivityIndicator.shared().start()
    // some async connection
  }

  func endConnection2() {
    NetworkActivityIndicator.shared().end()
    // if `activeCount` is above 0, remain indicator visible.
  }
}