在导航控制器中单击后退按钮时会调用哪个方法？

发布于 2024-12-12 22:37:39 字数 82 浏览 5 评论 0原文

我想在导航控制器中单击后退按钮时保存数据库。

所以我会在方法中插入代码。

在导航控制器中单击后退按钮时会调用什么方法？

原文

分享到QQ

分享到微博

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

需要登录才能够评论，你可以免费注册一个本站的账号。

紫轩蝶泪 2024-12-19 22:37:40

也许这不适合使用，但这对我有用。不要忘记设置 UINavaigationController 委托。

- (id <UIViewControllerAnimatedTransitioning>)navigationController:(UINavigationController *)navigationController
                                   animationControllerForOperation:(UINavigationControllerOperation)operation
                                                fromViewController:(UIViewController *)fromVC
                                                  toViewController:(UIViewController *)toVC
{
    NSLog(@"from VC class %@", [fromVC class]);
    if ([fromVC isKindOfClass:[ControllerYouJustPopped class]])
    {
        NSLog(@"Returning from popped controller");

    }

    return nil;
}

Maybe it's not appropriate use, but that worked for me. Don't forget to set UINavaigationController delegate.

- (id <UIViewControllerAnimatedTransitioning>)navigationController:(UINavigationController *)navigationController
                                   animationControllerForOperation:(UINavigationControllerOperation)operation
                                                fromViewController:(UIViewController *)fromVC
                                                  toViewController:(UIViewController *)toVC
{
    NSLog(@"from VC class %@", [fromVC class]);
    if ([fromVC isKindOfClass:[ControllerYouJustPopped class]])
    {
        NSLog(@"Returning from popped controller");

    }

    return nil;
}

回复收藏 0 原文

泡沫很甜 2024-12-19 22:37:39

要执行您要求的操作，请查看 UINavigationControllerDelegate 协议，即方法：

- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated

当 viewController 参数不再是您的视图控制器时，您应该保存。

然而，在 viewWillDisappear: 上这样做可能是一个更好（而且更简单）的想法。

To do what you asked, look at the UINavigationControllerDelegate protocol, namely the method:

- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated

when the viewController argument is no longer your view controller then you should save.

However, doing so on viewWillDisappear: might be a better (and much simpler) idea.

回复收藏 0 原文

~没有更多了~