UIAlertView +模态视图控制器不起作用

发布于 2024-12-05 00:31:31 字数 747 浏览 0 评论 0原文

我有一个 UIAlertView ，其中有“确定”和“取消”按钮。我想在按下 OK 按钮时呈现一个模式视图控制器。这是我到目前为止所做的：

创建 UIAlertView 框。实现了 UIAlertViewDelegate 协议。实现了 (void)alertView:(UIAlertView *)alert clickedButtonAtIndex:(NSInteger)buttonIndex 方法。

在上述方法中，当 buttonIndex == 0 时，我尝试执行以下操作：

if (buttonIndex == 0)
{
    ModalViewController *mdvc = [[[ModalViewController alloc] initWithNibName:nil bundle:nil] autorelease];
    [自我呈现ModalViewController：mdvc动画：是]；
}

事实证明，模态视图不会自行呈现。我尝试了许多其他方法，但它们只是让它变得复杂，让我创建了很多不必要的变量。一定有更简单的方法。

一些额外信息：

如果无论如何，这是一个 OpenGL ES 应用程序。
如果我因按下 UIButton 而调用 [self presentModalController:]，它确实会按预期工作 - 我会看到模态视图控制器。

原文

I have a UIAlertView that has the buttons "OK" and "Cancel". I'd like to present a modal view controller when the OK button is pressed. Here's what I have done so far:

Created the UIAlertView box. Implemented UIAlertViewDelegate protocol. Implemented (void)alertView:(UIAlertView *)alert clickedButtonAtIndex:(NSInteger)buttonIndex method.

In the above method, when buttonIndex == 0, I'm trying to do something to the effect of:

if (buttonIndex == 0)
{
    ModalViewController *mdvc = [[[ModalViewController alloc] initWithNibName:nil bundle:nil] autorelease];
    [self presentModalViewController:mdvc animated:YES];
}

As it turns out, the modal view does not present itself. I tried many other approaches but they are just making it complex and making me create a lot of unnecessary variables. There MUST be an easier way.

Some Extra Information:

If it matters in anyway, this is an OpenGL ES application.
If I invoke [self presentModalController:] as a result of a UIButton press, it does work as expected - I see the modal view controller.

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明月夜 2024-12-12 00:31:31

我也遇到了这个问题。很明显，警报必须在模式出现之前消失，因此您正在寻找一种方法来知道警报已消失。浏览一下文档，有一个简单的方法。

而不是在调用时呈现您的模式：

- (void)alertView:(UIAlertView *)alert clickedButtonAtIndex:(NSInteger)buttonIndex

使用：

- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex

这对我来说就像一个魅力。从文档中：

该方法在动画结束且视图显示后调用
隐藏。

I was having this problem as well. It seems clear the alert must be gone before the modal can present, so you're looking for a way to know the alert is gone. Skimming the docs, there is a simple way.

Instead of presenting your modal when this is called:

- (void)alertView:(UIAlertView *)alert clickedButtonAtIndex:(NSInteger)buttonIndex

Use:

- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex

This worked like a charm for me. From the documentation:

This method is invoked after the animation ends and the view is
hidden.

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凉月流沐 2024-12-12 00:31:31

好吧...所以我自己解决了这个问题。正如我所说，这是在 OpenGL ES 应用程序中，因此我设置了一些全局布尔值并在drawFrame 方法中调用了[selfpresentModalViewController]。我知道这绝对不是最好的方法，但在我所处的时间紧迫的情况下，似乎没有更好的解决办法！

这个问题肯定与延迟有关，但 performSelector:withObject:afterDelay 似乎还不够！

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花海 2024-12-12 00:31:31

的新方法

- (void)presentModal:(UIViewController *)mvc {
    [self presentModalViewController:mvc animated:YES];
}

首先，将该代码移至名为 presentModal:
然后，在处理 UIAlertView 响应的方法中，调用这个新方法，如下所示

ModalViewController *mdvc = [[[ModalViewController alloc] 
                                           initWithNibName:nil 
                                                    bundle:nil] autorelease];
[self performSelector:@selector(presentModal:) 
           withObject:mdvc 
           afterDelay:0.0];

这将推迟 presentModal: 方法的执行，直到处理 UIAlertView 的方法返回之后以及 UIAlertView 从屏幕上删除之后。

First, move that code to a new method named presentModal:

- (void)presentModal:(UIViewController *)mvc {
    [self presentModalViewController:mvc animated:YES];
}

Then, in the method where you handle the response from the UIAlertView, call this new method, like this

ModalViewController *mdvc = [[[ModalViewController alloc] 
                                           initWithNibName:nil 
                                                    bundle:nil] autorelease];
[self performSelector:@selector(presentModal:) 
           withObject:mdvc 
           afterDelay:0.0];

That will postpone the execution of the presentModal: method until after the method handling the UIAlertView has returned, and after the UIAlertView has been removed from the screen.

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