swift 透明导航栏

Swift 设置导航栏透明

        controller?.navigationController?.navigationBar.setBackgroundImage(UIImage(), for: .default)
        controller?.navigationController?.navigationBar.shadowImage = UIImage()

如果不起作用，可能是之前的controller影响了，可以放在

      override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
         
        //设置导航栏背景透明
        self.navigationController?.navigationBar.setBackgroundImage(UIImage(),
                                                                    for: .default)
        self.navigationController?.navigationBar.shadowImage = UIImage()
    }
     
    //视图将要消失
    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
         
        //重置导航栏背景
        self.navigationController?.navigationBar.setBackgroundImage(nil, for: .default)
        self.navigationController?.navigationBar.shadowImage = nil
    }