CustomActivityIndicator.swift

fileprivate var activityIndicator : UIImageView! = UIImageView(image: UIImage.gif(name:"load")) // load.gif file

override func viewDidLoad() {
	super.viewDidLoad()

	self.activityIndicator.frame = CGRect(x: 0, y: 0, width: 50, height: 50)
	self.activityIndicator.contentMode = .scaleAspectFit
	self.activityIndicator.backgroundColor = UIColor.clear
}

fileprivate func showActivityIndicator() {
	self.view.addSubview(self.activityIndicator)
	self.activityIndicator.center = self.view.center
	self.activityIndicator.startAnimating()
}
    
fileprivate func hideActivityIndicator() {
	self.activityIndicator.stopAnimating()
	self.activityIndicator.removeFromSuperview()
}