var options = BusyNavigationBarOptions()

/**
    Animation type

    - Stripes: Sliding stripes as seen in Periscope app.
    - Bars: Bars going up and down like a wave.
    - CustomLayer(() -> CALayer): Your layer to be inserted in navigation bar. In this case, properties other than `transparentMaskEnabled` and `alpha` will not be used. 
*/
options.animationType = .Stripes

/// Color of the shapes. Defaults to gray.
options.color = UIColor.grayColor()

/// Alpha of the animation layer. Remember that there is also an additional (constant) gradient mask over the animation layer. Defaults to 0.5.
options.alpha = 0.5

/// Width of the bar. Defaults to 20.
options.barWidth = 20

/// Gap between bars. Defaults to 30.
options.gapWidth = 30

/// Speed of the animation. 1 corresponds to 0.5 sec. Defaults to 1.
options.speed = 1

/// Flag for enabling the transparent masking layer over the animation layer.
options.transparentMaskEnabled = true


// Start animation
self.navigationController?.navigationBar.start(options)

// Stop animation
self.navigationController?.navigationBar.stop()