iOS Error management snippet 2

.swift

func getDataFromUrl(url: URL, completion:(_ data: Data?, _ error: NSError?) -> Void) {
	...
	if (error) {
		// Show error in UIAlertcontroller 
		//or 
		//send it up with a delegate/completion block to the higher level of the app.
	}
	else if (data) {
		// Do something
	}
	...
}