如何删除并添加back navigationBar shadow？

Question

if I remove navigationBar shadow:

self.navigationController?.navigationBar.shadowImage = UIImage()

how I can add back this shadow?

Answer 1

//Extension 
  extension UINavigationBar {

    func shouldRemoveShadow(_ value: Bool) -> Void {
    if value {
        self.setValue(true, forKey: "hidesShadow")
    } else {
        self.setValue(false, forKey: "hidesShadow")
    }
  }
 }
 //Use in view controller.
 self.navigationController?.navigationBar.shouldRemoveShadow(true)

Answer 2

From the docs .

The default value is nil, which corresponds to the default shadow image.

So it should be enough that you set

self.navigationController?.navigationBar.shadowImage = nil