override func viewDidLoad() {
    super.viewDidLoad()

    self.statesView.dataSource = self
    self.statesView.circleMaxSize = 80
    self.statesView.backgroundColor = UIColor.whiteColor()
    ...
}

extension ViewController: CircularStatesViewDataSource {

    func numberOfStatesInCricularStatesView(cricularStatesView: CircularStatesView) -> Int {
        return 4
    }

    func cricularStatesView(cricularStatesView: CircularStatesView, isStateActiveAtIndex index: Int) -> Bool {
        return index <= self.myModelState
    }
    ...
}

// The DataSource
public weak var dataSource: CircularStatesViewDataSource?

/// The number of states in view
public var numberOfStates: Int { get }

/// The circle's active state fill color
public var circleActiveColor: UIColor

/// The circle's in-active state fill color
public var circleInactiveColor: UIColor

/// The circle's border color
public var circleBorderColor: UIColor

/// The width of the border
public var circleBorderWidth: CGFloat

/// The circle size (diameter) is calculated using the view height and seperatorLength
public var circleSize: CGFloat { get }

/// Overrides the circle size calculation with a pre defined max size, min(calculatedSize(), circleMaxSize)
public var circleMaxSize: CGFloat?

/// The length of the seperator line between each circle state
public var seperatorLength: CGFloat

/// The line seperator color
public var seperatorColor: UIColor

/// The line seperator width
public var seperatorWidth: CGFloat

/// The states title font
public var stateTitleFont: UIFont

/// The color for the active title text label
public var titleLabelActiveTextColor: UIColor

/// The color for the inactive title text label
public var titleLabelInactiveTextColor: UIColor

/// The index for the state with activity indicator
public var indexForStateWithActivityIndicator: Int?

/// The color for the activity indicator
public var stateActivityIndicatorColor: UIColor

func reloadData()

public protocol CircularStatesViewDataSource: class {
    /**
     Return the number of states in the view
     - parameter circularStatesView: The CircularStatesView
     - returns: The number of states
     */
    func numberOfStatesInCircularStatesView(circularStatesView: CircularStatesView) -> Int

    /**
     Return whether the state at index is active or inactive
     - parameter circularStatesView: The CircularStatesView
     - parameter index: The state index
     - returns: true/false for active/inactive state
     */
    func circularStatesView(circularStatesView: CircularStatesView, isStateActiveAtIndex index: Int) -> Bool

    /**
     Return the title string for the state, this title we'll be displayed along side the state
     - parameter circularStatesView: The CircularStatesView
     - parameter index: The state index
     - returns: title string or nil if you don't need a title for the specific state
     */
    func circularStatesView(circularStatesView: CircularStatesView, titleForStateAtIndex index: Int) -> String?

    /**
     Return image icon for active state, this icon will be shown in the circle center
     - parameter circularStatesView: The CircularStatesView
     - parameter index: The state index
     - returns: UIImage for the image icon or nil if you don't want to show an icon
     */
    func circularStatesView(circularStatesView: CircularStatesView, imageIconForActiveStateAtIndex index: Int) -> UIImage?

    /**
     Return image icon for inactive state, this icon will be shown in the circle center
     - parameter circularStatesView: The CircularStatesView
     - parameter index: The state index
     - returns: UIImage for the image icon or nil if you don't want to show an icon
     */
    func circularStatesView(circularStatesView: CircularStatesView, imageIconForInActiveStateAtIndex index: Int) -> UIImage?
}