如何检测是否从导航控制器中弹出了视图控制器? [英] How to detect if view controller is being popped of from the navigation controller?
问题描述
当我从导航控制器弹出顶视图控制器时,我当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弹出?
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?
我想尽可能远离使用 viewWillDisappear
或 viewDidDisappear
因为我在我的项目中使用 splitview
,并且在主视图中选择另一行也会触发 viewWillDisappear
/ viewDidDisappear
methods。
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.
推荐答案
你可以使用视图控制器的 isMovingFromParentViewController
属性检测是否正在弹出视图,如下所示:
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");
}
}
< a href =https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIViewController_Class/index.html#//apple_ref/occ/instm/UIViewController/isMovingFromParentViewController> isMovingFromParentViewController
isMovingFromParentViewController
返回一个布尔值,指示视图控制器在
中从父项中删除的过程。
Returns a Boolean value that indicates that the view controller is in the process of being removed from its parent.
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