You shouldn't call viewDidLoad method manually, Instead if you want to reload any data or any UI, you can use this:
override func viewDidLoad() {
super.viewDidLoad();
let myButton = UIButton()
// When user touch myButton, we're going to call loadData method
myButton.addTarget(self, action: #selector(self.loadData), forControlEvents: .TouchUpInside)
// Load the data
self.loadData();
}
func loadData() {
// code to load data from network, and refresh the interface
tableView.reloadData()
}
Whenever you want to reload the data and refresh the interface, you can call self.loadData()