ios development -- use xib to adapt to iPhone X

Recently, I am modifying an old project. There are many xib files in it. I need to adapt it to iPhone X, but I don't want to rewrite the page to adapt it with code. It is a stupid way to share a small method.

Adapt to the bottom of iPhone X. There is a 34px operation area at the bottom of iPhone X, while other models do not have it. The specific steps are as follows:

1、

2、

3. Double-click the arrow in the figure above to enter the following interface:

 

 Then, there you go!

The above navigation is adapted. I haven't found out how to use it yet. If you have any good way, you can share it. This is a stupid way.

Proceed as follows:

1，

2, the specific code:

self.bgViewTop.constant = NavHeight;
[self.bgView setNeedsLayout];

Then it works!