ios - 如何检测是否从导航 Controller 弹出 View Controller ？

Question

当顶 View Controller 从我的导航 Controller 中弹出时，我目前需要实现一些代码。有没有办法检测 View Controller 何时从导航 Controller 堆栈中弹出？

我想尽可能避免使用 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。

Answer 1

您可以使用 View Controller 的 isMovingFromParentViewController 属性检测是否正在弹出 View ，如下所示:

- (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.