如何检测视图控制器是否从导航控制器中弹出? [英] How to detect if view controller is being popped of from the navigation controller?

问题描述

当顶部视图控制器从我的导航控制器中弹出时，我目前需要实现一些代码.有没有办法检测视图控制器何时从导航控制器堆栈中弹出?

我想尽可能不使用 viewWillDisappear 或 viewDidDisappear，因为我在我的项目中使用了 splitview，并且在主视图中选择不同的行也会触发 viewWillDisappear/viewDidDisappear 方法.

解决方案

您可以使用视图控制器的 isMovingFromParentViewController 属性来检测视图是否被弹出，如下所示:

- (void)viewWillDisappear:(BOOL)animated{[super viewWillDisappear:animated];if ([self isMovingFromParentViewController]){NSLog(@"视图控制器被弹出");}别的{NSLog(@"新的视图控制器被推送");}}

<块引用>

isMovingFromParentViewController

返回一个布尔值，表示视图控制器在从父级移除的过程.

I currently need to implement some code when the top view controller is being popped off from my navigation controller. Is there a way to detect when the view controller is being popped off the navigation controller stack?

As much as possible I want to stay away from using viewWillDisappear or viewDidDisappear because I'm using a splitview in my project, and selecting a different row in the master view will also trigger the viewWillDisappear/viewDidDisappear methods.

解决方案

You can detect whether a view is being popped using the isMovingFromParentViewController property for a view controller as shown below:

- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
    if ([self isMovingFromParentViewController])
    {
        NSLog(@"View controller was popped");
    }
    else
    {
        NSLog(@"New view controller was pushed");
    }
}

isMovingFromParentViewController

Returns a Boolean value that indicates that the view controller is in the process of being removed from its parent.

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