Load custom UIView from Nib in Swift using generics. Thanks to Logan (http://stackoverflow.com/users/2611971/logan)

UIView+Nib.swift

class func fromNib<T : UIView>(nibNameOrNil: String? = nil) -> T {
    let v: T? = fromNib(nibNameOrNil)
    return v!
}

class func fromNib<T : UIView>(nibNameOrNil: String? = nil) -> T? {
    var view: T?
    let name: String
    if let nibName = nibNameOrNil {
        name = nibName
    } else {
        // Most nibs are demangled by practice, if not, just declare string explicitly
        name = "\(T.self)".componentsSeparatedByString(".").last!
    }
    let nibViews = NSBundle.mainBundle().loadNibNamed(name, owner: nil, options: nil)
    for v in nibViews {
        if let tog = v as? T {
            view = tog
        }
    }
    return view
}