loadViewFromNib.swift

--http://stackoverflow.com/a/26326006/5222077

public extension UIView {
    public class func fromNib(nibNameOrNil: String? = nil) -> Self {
        return fromNib(nibNameOrNil, type: self)
    }

    public class func fromNib<T : UIView>(nibNameOrNil: String? = nil, type: T.Type) -> T {
        let v: T? = fromNib(nibNameOrNil, type: T.self)
        return v!
    }

    public class func fromNib<T : UIView>(nibNameOrNil: String? = nil, type: T.Type) -> 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 = nibName
        }
        let nibViews = NSBundle.mainBundle().loadNibNamed(name, owner: nil, options: nil)
        for v in nibViews {
            if let tog = v as? T {
                view = tog
            }
        }
        return view
    }

    public class var nibName: String {
        let name = "\(self)".componentsSeparatedByString(".").first ?? ""
        return name
    }
    public class var nib: UINib? {
        if let _ = NSBundle.mainBundle().pathForResource(nibName, ofType: "nib") {
            return UINib(nibName: nibName, bundle: nil)
        } else {
            return nil
        }
    }
}

let myCustomView = CustomView.fromNib()
// or if you're unsure whether or not the nib exists
let myCustomView: CustomView? = CustomView.fromNib()
//If you need to be specific about the nib name for whatever reason, pass a string arg:

let myCustomView = MyCustomView.fromNib("non-conventional-name")

//Using this with a private view class seems to cause issues. This appears to be a system wide issue.