The problem
Customize view and then use xib to load this view. Run it and then crash :

Thread 1: Fatal error: init(coder:) has not been implemented

The solution
will

required init?(coder aDecoder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
}

Just call the superclass method instead:

required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
}