xcode 9 工程下xib中控件在8系统崩溃

添加如下代码就OK： 

override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: Bundle?) {

        super.init(nibName: "自定制的controller的类名", bundle: nil)

    }

    required init?(coder aDecoder: NSCoder) {

        fatalError("init(coder:) has not been implemented")

    }