does not work with Swift 3 !!

[mmazil]

/Pods/FontWeather.swift/FontWeather/FontWeather.swift:37:36: 'dispatch_once_t' is unavailable in Swift: Use lazily initialized globals instead

   struct Static {
        static var onceToken : dispatch_once_t = 0
    }

    let name = "FontWeather"
    if UIFont.fontNames(forFamilyName: name).isEmpty {
        dispatch_once(&Static.onceToken) {
            FontLoader.loadFont(name)
        }
    }