iOS 5：在解除iPad中的模态后不调用-viewWillAppear [英] iOS 5 : -viewWillAppear is not called after dismissing the modal in iPad

问题描述

我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主视图。

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

[self dismissModalViewControllerAnimated:YES];

因此用它来调用 -viewWillAppear by默认。

So it use to call -viewWillAppear by default.

我的问题是，

iOS4.3正常运行。

但它不适用于 iOS5 。

我该怎么办？或者是 iOS5 中的任何错误？

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

推荐答案

-viewWillAppear 仅保证在已调用 -viewWillDisappear 的地方调用。对于iPad上的大多数模态窗口，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.

问题的解决方案将取决于您的需求， -viewWillAppear for，但一般情况下，你可能需要直接从你解雇模态视图控制器的同一个地方拨打电话。

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.

这种情况的一种常见机制，特别是在你可能在其他地方使用相同模态视图的情况下，是为模态视图控制器提供一个委托，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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