iOS导航控制器中的后退按钮回调 [英] back button callback in navigationController in iOS

问题描述

我已将视图推送到导航控制器上，当我按下后退按钮时，它会自动转到上一个视图.在从堆栈中弹出视图之前按下后退按钮时，我想做一些事情.返回按钮回调函数是哪个?

I have pushed a view onto the navigation controller and when I press the back button it goes to the previous view automatically. I want to do a few things when back button is pressed before popping the view off the stack. Which is the back button callback function?

推荐答案

William Jockusch 的 answer 用简单的技巧解决了这个问题.

William Jockusch's answer solve this problem with easy trick.

-(void) viewWillDisappear:(BOOL)animated {
    if ([self.navigationController.viewControllers indexOfObject:self]==NSNotFound) {
       // back button was pressed.  We know this is true because self is no longer
       // in the navigation stack.  
    }
    [super viewWillDisappear:animated];
}

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