快速按下导航栏的后退按钮时重新加载视图控制器2
问题描述：
我有三个视图控制器，在第三个视图控制器中，我有一个选择器视图，它将数据存储到核心数据中，当我按下导航栏的后退按钮时，我希望第二个视图控制器从核心数据中刷新它的标签，但是我没有不知道如何 有什么建议吗?
I have three view controllers which in the third one I have a picker view which it store data into core data, and when I press navigation bar back button I want second view controller to refresh it's labels from core data, but I don't know how Any suggestion ?
答
在第二个视图控制器的viewWillAppear()方法中使用NSFetchRequest()方法
Use NSFetchRequest() method in viewWillAppear() method in second view controller