Swift prototype helpers (WIP)

Prototype.swift

// Generate a random color
func randomColor() -> UIColor {
    let hue : CGFloat = CGFloat(arc4random() % 256) / 256 // use 256 to get full range from 0.0 to 1.0
    let saturation : CGFloat = CGFloat(arc4random() % 128) / 256 + 0.5 // from 0.5 to 1.0 to stay away from white
    let brightness : CGFloat = CGFloat(arc4random() % 128) / 256 + 0.5 // from 0.5 to 1.0 to stay away from black
        
    return UIColor(hue: hue, saturation: saturation, brightness: brightness, alpha: 1)
}

// Execute block after delay
func delay(delay:Double, closure:()->()) {
    dispatch_after(
        dispatch_time(
            DISPATCH_TIME_NOW,
            Int64(delay * Double(NSEC_PER_SEC))
        ),
        dispatch_get_main_queue(), closure)
}

// Show network activity indicator icon
func showNetworkActivityIndicator() {
    UIApplication.sharedApplication().networkActivityIndicatorVisible = true
}

// Hide network activity indicator icon
func hideNetworkActivityIndicator() {
    UIApplication.sharedApplication().networkActivityIndicatorVisible = false
}

// White status bar
// Make sure you've set `View controller-based status bar appearance = NO` in your .plist
func setLightStatusBar() {
    UIApplication.sharedApplication().statusBarStyle = .LightContent
}

// Translate a value between two ranges
func modulate(value: CGFloat, r1Min: CGFloat, r1Max: CGFloat, r2Min: CGFloat, r2Max: CGFloat) -> CGFloat {
    var ratio = (r2Max - r2Min) / (r1Max - r1Min)
    return value * ratio + r2Min - r1Min * ratio
}