How to remove bottom shadow for navigationBar in swift3

Question

我尝试将图像设置为空，但无法正常工作

navigationController?.navigationBar.shadowImage = UIImage()

Answer 1

setting background image & shadow images working for me. Thanks @xingou

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

Answer 2

this is what the API document said :

The default value is nil, which corresponds to the default shadow image. When non-nil, this property represents a custom shadow image to show instead of the default. To show a custom shadow image, you must also set a custom background image with the setBackgroundImage(_:for:) method. If the default background image is used, then the default shadow image is used regardless of the value of this property.

so you need set the backgroundimage first.