[swift3] Create Simple Progress Dialog View (ProgressBar, ProgressIndicator, LoadingProgress)

- declare

	import UIKit
	class ProgressDialogView: UIView {
	let activityIndictor: UIActivityIndicatorView = UIActivityIndicatorView(activityIndicatorStyle: UIActivityIndicatorViewStyle.white)
	init() {
	super.init(frame: CGRect(x: 0,
	y: 0,
	width: 0,
	height: 0))
	self.setup()
	}
	required init?(coder aDecoder: NSCoder) {
	super.init(coder: aDecoder)
	self.setup()
	}
	func setup() {
	self.addSubview(activityIndictor)
	activityIndictor.startAnimating()
	}
	override func didMoveToSuperview() {
	super.didMoveToSuperview()
	if let superview = self.superview {
	let width = superview.frame.size.width
	let height = superview.frame.size.height
	self.frame = CGRect(x: 0,
	y: 0,
	width: width,
	height: height)
	self.backgroundColor = UIColor.init(white: 0.0, alpha: 0.5)
	let activityIndicatorSize: CGFloat = 40
	activityIndictor.frame = CGRect(x: width / 2 - activityIndicatorSize / 2,
	y: height / 2 - activityIndicatorSize / 2,
	width: activityIndicatorSize,
	height: activityIndicatorSize)
	layer.masksToBounds = true
	}
	}
	func show() {
	self.isHidden = false
	}
	func hide() {
	self.isHidden = true
	}
	}

view raw ProgressDialogView.swift hosted with ❤ by GitHub

- usage

	import UIKit
	class UsageUIViewController: UIViewController {
	let progressDialog:ProgressDialogView = ProgressDialogView()
	override func viewDidLoad() {
	super.viewDidLoad()
	self.view.addSubview(progressDialog)
	}
	override func viewWillAppear(_ animated: Bool) {
	showProgressDialog()
	}
	override func viewWillDisappear(_ animated: Bool) {
	hideProgressDialog()
	}
	func showProgressDialog() {
	self.progressDialog.show()
	}
	func hideProgressDialog() {
	self.progressDialog.hide()
	}
	}

view raw UsageUIViewController.swift hosted with ❤ by GitHub

- preview