let meterView = AMMeterView(frame: view.bounds)

// customize here

meterView.delegate = self
meterView.dataSource = self
view.addSubview(meterView)

/// DataSource
// Required
func numberOfValue(in meterView: AMMeterView) -> Int
func meterView(_ meterView: AMMeterView, titleForValueAtIndex index: Int) -> String
// Optional
func meterView(_ meterView: AMMeterView, textColorForValueAtIndex index: Int) -> UIColor // default is black
func meterView(_ meterView: AMMeterView, textFontForValueAtIndex index: Int) -> UIFont // default is System 15.0

/// Delegate
func meterView(_ meterView: AMMeterView, didSelectAtIndex index: Int) { 
    // use selected index here
}

@IBInspectable public var meterBorderLineWidth: CGFloat = 5
@IBInspectable public var valueIndexWidth: CGFloat = 2.0
@IBInspectable public var valueHandWidth: CGFloat = 3.0
@IBInspectable public var meterBorderLineColor: UIColor = .black
@IBInspectable public var meterColor: UIColor = .clear
@IBInspectable public var valueHandColor: UIColor = .red
@IBInspectable public var valueIndexColor: UIColor = .black