IOS：presentmodalviewcontroller 版本

发布于 2024-12-28 03:03:06 字数 547 浏览 3 评论 0原文

我使用此代码打开视图控制器

self.secondViewController = [[SecondViewController alloc]initWithNibName:@"SecondViewController" bundle:nil];
[self presentModalViewController:self.secondViewController animated:YES];

[self.secondViewController release];

，但如果我使用 [self.secondViewController release]; 当我第二次调用此代码时它会崩溃，因为

[FirstViewController performSelector:withObject:withObject:]: message sent to deallocated instance 0x18a890

如果我不使用它，一切都可以，但是在这种情况下，我什么时候可以释放我的第二个视图控制器？你能帮助我吗？

原文

I use this code ti open a viewcontroller

self.secondViewController = [[SecondViewController alloc]initWithNibName:@"SecondViewController" bundle:nil];
[self presentModalViewController:self.secondViewController animated:YES];

[self.secondViewController release];

but if i use [self.secondViewController release]; when I call this code second time it crash because

[FirstViewController performSelector:withObject:withObject:]: message sent to deallocated instance 0x18a890

if I don't use it, it it's all ok, but in this situation when can I dealloc my secondviewcontroller?
can you help me?

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生活了然无味 2025-01-04 03:03:06

从您的代码（self.secondViewController）来看，我的理解是您已将 secondViewController 声明为 .h 文件中的变量，并且 @synthesize将其添加到您的 .m 文件中。
如果是这样的话，我宁愿做以下事情

if (self.secondViewController == nil)
    self.secondViewController = [[SecondViewController alloc] initWithNib:@"SecondViewController" bundle:nil];

[自我呈现ModalViewController：self.secondViewController动画：是]；

在您的 - (void)dealloc 方法中，我将添加 [self.secondViewController release]; 并在 - (void)viewDidUnload 中添加添加[self setSecondViewController:nil];。

上面的代码假设您不使用 ARC。
如果您使用 ARC，我将修改我的代码如下：

// 不要在 .h 文件中将 secondaryViewController 声明为变量
// 相反，在故事板中，给它一个标识符，例如 secondaryViewController
// 和 

SecondViewController *svc = [self.storyboard instantiateViewControllerWithIdentifier:@"secondViewController"];
[自我呈现ModalViewController：svc动画：是]；
svc = 零；

From your code (self.secondViewController), my understanding is that you have declared secondViewController as a variable in your .h file, and @synthesize'd it in your .m file.
If that's right, I would rather do the followings

if (self.secondViewController == nil)
    self.secondViewController = [[SecondViewController alloc] initWithNib:@"SecondViewController" bundle:nil];

[self presentModalViewController:self.secondViewController animated:YES];

and in your - (void)dealloc method, I would add [self.secondViewController release]; and in - (void)viewDidUnload I would add [self setSecondViewController:nil];.

The above code is with the assumption that you are not using ARC.
If you are using ARC, I would revise my code as follows:

// Do not declare secondViewController as a variable in your .h file
// Instead, in storyboard, give it an identifier, e.g. secondViewController
// and 

SecondViewController *svc = [self.storyboard instantiateViewControllerWithIdentifier:@"secondViewController"];
[self presentModalViewController:svc animated:YES];
svc = nil;

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