How to display an activity indicator with text on iOS 8 with Swift?

Question

I wanna show, programmatically, an activity indicator with text, like the one in the Photos app (after editing and saving a picture). How can I do this?

Answer 1

For Swift 3

Usage

class LoginTVC: UITableViewController {
    var loadingView : LoadingView!

    override func viewDidLoad() {
        super.viewDidLoad()

        // CASE 1: To Show loadingView on load

        loadingView = LoadingView(uiView: view, message: "Sending you verification code")
    }

    // CASE 2: To show loadingView on click of a button

    @IBAction func showLoadingView(_ sender: UIButton) {
        if let loaderView = loadingView{ // If loadingView already exists
            if loaderView.isHidden() {
                loaderView.show()  // To show activity indicator
            }
        }
        else{
            loadingView = LoadingView(uiView: view, message: "Sending you verification code")
         }
    }
}

    // CASE 3: To hide LoadingView on click of a button

    @IBAction func hideLoadingView(_ sender: UIButton) {
        if let loaderView = loadingView{ // If loadingView already exists 
            self.loadingView.hide()   
        }
    }
}

LoadingView Class

class LoadingView {

    let uiView          :   UIView
    let message         :   String
    let messageLabel    =   UILabel()

    let loadingSV       =   UIStackView()
    let loadingView     =   UIView()
    let activityIndicator: UIActivityIndicatorView = UIActivityIndicatorView(activityIndicatorStyle: UIActivityIndicatorViewStyle.gray)

    init(uiView: UIView, message: String) {
        self.uiView     =   uiView
        self.message    =   message
        self.setup()
    }

    func setup(){
        let viewWidth   = uiView.bounds.width
        let viewHeight  = uiView.bounds.height

        // Configuring the message label
        messageLabel.text             = message
        messageLabel.textColor        = UIColor.darkGray
        messageLabel.textAlignment    = .center
        messageLabel.numberOfLines    = 3
        messageLabel.lineBreakMode    = .byWordWrapping

        // Creating stackView to center and align Label and Activity Indicator
        loadingSV.axis          = .vertical
        loadingSV.distribution  = .equalSpacing
        loadingSV.alignment     = .center
        loadingSV.addArrangedSubview(activityIndicator)
        loadingSV.addArrangedSubview(messageLabel)

        // Creating loadingView, this acts as a background for label and activityIndicator
        loadingView.frame           = uiView.frame
        loadingView.center          = uiView.center
        loadingView.backgroundColor = UIColor.darkGray.withAlphaComponent(0.3)
        loadingView.clipsToBounds   = true

        // Disabling auto constraints
        loadingSV.translatesAutoresizingMaskIntoConstraints = false

        // Adding subviews
        loadingView.addSubview(loadingSV)
        uiView.addSubview(loadingView)
        activityIndicator.startAnimating()

        // Views dictionary
        let views = [
            "loadingSV": loadingSV
        ]

        // Constraints for loadingSV
        uiView.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|-[loadingSV(300)]-|", options: [], metrics: nil, views: views))
        uiView.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|-\(viewHeight / 3)-[loadingSV(50)]-|", options: [], metrics: nil, views: views))
    }

    // Call this method to hide loadingView
    func show() {
        loadingView.isHidden = false
    }

    // Call this method to show loadingView
    func hide(){
        loadingView.isHidden = true
    }

    // Call this method to check if loading view already exists
    func isHidden() -> Bool{
        if loadingView.isHidden == false{
            return false
        }
        else{
            return true
        }
    }
}