swift – 使子视图适合容器内部并正确调整大小

在将NibView添加为内容视图的子视图后,尝试在NibView上调用以下函数(addFullScreenConsTraint)：

extension UIView {

    /// Adds consTraints to this `UIView` instances `superview` object
    /// to make sure this always has the same size as the superview.
    /// Please note that this has no effect if its `superview` is `nil`
    /// – add this `UIView` instance as a subview before calling this.
    func addFullScreenConsTraints() {
        guard let superview = self.superview else {
            return
        }

        self.translatesAutoresizingMaskIntoConsTraints = false
        superview.addConsTraints(NSLayoutConsTraint.consTraints(withVisualFormat: "H:|-0-[subview]-0-|",options: .directionLeadingToTrailing,metrics: nil,views: ["subview": self]))
        superview.addConsTraints(NSLayoutConsTraint.consTraints(withVisualFormat: "V:|-0-[subview]-0-|",views: ["subview": self]))
    }
}