（记录）ios自定义toast

 func showMsgView(localizableString: String){
        DispatchQueue.main.async {
            if let l = self.msgLabel {
                l.removeFromSuperview()
            }
            let txt = NSLocalizedString(localizableString, comment: "Default")
            let cgSize = CGSize(width: SCREEN_WIDTH * 0.8, height: SCREEN_HEIGHT)
            let textSize = NSString(string: txt).boundingRect(with: cgSize, options: [NSStringDrawingOptions.truncatesLastVisibleLine , NSStringDrawingOptions.usesFontLeading , NSStringDrawingOptions.usesLineFragmentOrigin], attributes: [NSFontAttributeName : UIFont.systemFont(ofSize: 16.0)], context: nil)
            let textRect = CGRect(x: (SCREEN_WIDTH - textSize.width) / 2.0 - 5.0, y:SCREEN_HEIGHT - 50.0 - textSize.height / 2.0 - 5.0 , width: textSize.width + 10.0, height: textSize.height + 10.0)
            let label:UILabel = UILabel.init(frame: textRect)
            label.text = txt
            label.textColor = self.thoastTxColor
            label.font = UIFont.systemFont(ofSize: 16.0)
            label.backgroundColor = self.thoastBgColor
            label.numberOfLines = 0
            label.alpha = 1
            label.textAlignment = .center
            label.layer.cornerRadius = 5
            label.layer.masksToBounds = true
            self.view.addSubview(label)
            self.msgLabel = label
            UIView.animate(withDuration: 3.5, animations: {
                label.alpha = 0
            })
        }
    }