Initialize Swift subclass of UIView, designed in .xib

gistfile1.swift

// Create CustomView.xib, set File's Owner to CustomView. 
// Link the top level view in the XIB to the contentView outlet.

class CustomView : UIView {
    @IBOutlet weak private var contentView:UIView!
    // other outlets
    
    override init(frame: CGRect) { // for using CustomView in code
        super.init(frame: frame)
        self.commonInit()
    }
    
    required init(coder aDecoder: NSCoder) { // for using CustomView in IB
        super.init(coder: aDecoder)
        self.commonInit()
    }
    
    private func commonInit() {
        NSBundle.mainBundle().loadNibNamed("CustomView", owner: self, options: nil)
        contentView.frame = self.bounds
        contentView.autoresizingMask = .FlexibleHeight | .FlexibleWidth
        self.addSubview(contentView)
    }
}