sample.swift

# 1.1 Toast Message like Android
extension UIViewController {

func showToast(message : String, time: TimeInterval) {

    let font:UIFont = .systemFont(ofSize: 12.0)
    let fontAttributes = [NSAttributedString.Key.font: font]
    let size = (message as NSString).size(withAttributes: fontAttributes)
    var width: CGFloat = size.width
    var height: CGFloat = 35
    if (width > self.view.frame.size.width - 20) {
        height = height * ceil(width / (self.view.frame.size.width - 20))
        width = self.view.frame.size.width - 20
    }
    let toastLabel = UILabel(frame: CGRect(x: (self.view.frame.size.width / 2) - (width / 2), y: self.view.frame.size.height / 2, width: width, height: height))
    toastLabel.lineBreakMode = .byCharWrapping
    toastLabel.backgroundColor = UIColor.black.withAlphaComponent(0.6)
    toastLabel.textColor = UIColor.white
    toastLabel.font = font
    toastLabel.textAlignment = .center;
    toastLabel.text = message
    toastLabel.alpha = 1.0
    toastLabel.layer.cornerRadius = 10;
    toastLabel.clipsToBounds  =  true
    self.view.addSubview(toastLabel)
    UIView.animate(withDuration: 0.5, delay: time, options: .curveEaseOut, animations: {
         toastLabel.alpha = 0.0
    }, completion: {(isCompleted) in
        toastLabel.removeFromSuperview()
    })
}