Manage multiple networkActivityIndicator(s) just by calling a single function and passing a BOOL, the function will take care of the rest. Simple and easy.

InYourAppDelegate.swift

var networkActivityIndicatorCount = 0

func setNetworkActivityIndicatorVisible(visible:Bool) {
	if visible {
		networkActivityIndicatorCount++
	} else {
		networkActivityIndicatorCount--
	}

	if networkActivityIndicatorCount < 0 {
		networkActivityIndicatorCount = 0
	}
	
	UIApplication.sharedApplication().networkActivityIndicatorVisible = networkActivityIndicatorCount > 0
}

YourClassFile.swift

func taskStarted() {
	(UIApplication.sharedApplication().delegate as! AppDelegate).setNetworkActivityIndicatorVisible(true)
}

func taskEnded() {
	(UIApplication.sharedApplication().delegate as! AppDelegate).setNetworkActivityIndicatorVisible(false)
}