iOS 5:在 iPad 中关闭模式后不调用 -viewWillAppear

iOS 5 : -viewWillAppear is not called after dismissing the modal in iPad(iOS 5:在 iPad 中关闭模式后不调用 -viewWillAppear)

问题描述

我正在使用以下代码呈现模态:

I am presenting modal using the following code :

AddName *add = [[AddName alloc] initWithNibName:@"AddName" bundle:nil]
add.modalPresentationStyle = UIModalPresentationFormSheet;

[self presentModalView:add animated:YES];

在我工作之后，我使用以下代码返回我的主视图.

And After my work I use following code to go back on my main view.

[self dismissModalViewControllerAnimated:YES];

所以默认调用-viewWillAppear.

我的问题是，

在 iOS4.3 上运行良好.

但它不适用于 iOS5.

我该怎么办?或者这是 iOS5 中的任何错误吗?

What should I do ? Or Is that any bug in iOS5?

推荐答案

-viewWillAppear 只保证在 -viewWillDisappear 也被调用的地方被调用.对于 iPad 上的大多数模式窗口，情况并非如此，因为它们不会遮挡整个页面.

-viewWillAppear is only guaranteed to be called in places where the -viewWillDisappear has also been called. For most modal windows on the iPad, this is not the case, since they don't obscure the entire page.

您的问题的解决方案将取决于您需要 -viewWillAppear 来做什么，但一般来说，您可能需要直接从您关闭模式的同一个地方拨打电话视图控制器.

The solution to your problem will depend on what you need the -viewWillAppear for, but in general, you're likely to need to make a call directly from the same place that you dismiss the modal view controller.

一种常见的机制，尤其是在您可能在其他地方使用相同的模态视图的情况下，是给模态视图控制器一个委托，当视图即将消失时调用该委托.这将使您有机会从模态窗口中获取响应，甚至只是在委托视图中强制重新加载数据.

One common mechanism for this, especially in cases where you might use that same modal view somewhere else, is to give the modal view controller a delegate which is called when the view is about to disappear. This will give you a chance to take the responses from the modal window, or even just force a data reload in the delegate view.

希望这会有所帮助.

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