如何捕获UINavigationBar后退按钮按下事件

Question

How to to catch the UINavigationBar back button pressed event? I hope to do something before it navigate/go back to the previous viewcontroller.

Welcome any comment

Answer 1

您可以设置UINavigationBar.delegate属性，并实现UINavigationBarDelegate协议的navigationBar:shouldPopItem:或navigationBar:didPopItem:方法。