iPhone - 内存泄漏 - NSData dataWithContentsOfUrl &网页视图 [英] iPhone - Memory Leak - NSData dataWithContentsOfUrl & UIWebView

问题描述

请帮忙！已经盯着这个看了 12 个小时；并在网上查找并找不到解决方案.

Please help! Have been staring at this for 12 hours; and have looked online and can't find solution.

在我的应用程序中，我在单独的页面/控制器中使用了 2 个 UIView 控件:

In my application, I use 2 UIView controls in separate pages/controllers:

• UIImageView(通过NSData dataWithContentsOfUrl)
• UIWebView

为了隔离我的代码并使其更易于解释，我创建了一个名为MyTestApplication"的基于视图的新项目

Just to isolate my code, and make it easier to explain, I created a new view based project called "MyTestApplication"

1 - 我在委托函数中添加了一个简单的 NSData dataWithContentsOfUrl.

1 - I added a simple NSData dataWithContentsOfUrl in the delegate function.

NSData *imageData = [NSData dataWithContentsOfURL:
  [NSURL URLWithString:@"http://www.google.com/intl/en_ALL/images/logo.gif"]];

(这里没有发布，因为都是使用便利功能)

(Nothing to release here since it's all using convenience functions)

替代文本 http://img.skitch.com/20081110-j5tn5n7ixph95wppre.jpg

查看图片

2 - 运行它以验证没有泄漏(如预期)

2 - Run it to verify no leaks (as expected)

替代文字 http://img.skitch.com/20081110-fy2qrkgy41hm4viewf.jpg

查看图片

3 - 打开 ViewController.xib 并简单地从库中添加一个 UIWebView(无需连接)

3 - Open the ViewController.xib and simply add a UIWebView from the library (no need to wire it up)

替代文字 http://img.skitch.com/20081110-d63c3qicyh161kqiciy73q8uyd68j.preview.jpg.jpg

查看图片

4 - 运行它以验证是否存在泄漏！(为什么???)

4 - Run it to verify there are leaks! (why???)

替代文字 http://img.skitch.com/20081110-qtxcfwntbj6rnf.jpg

查看图片

我做错了什么?请帮忙！

What am I doing wrong? Please help!

如果我使用 UIWebView，为什么 NSData 会导致内存泄漏?我只是不明白.谢谢.

Why would NSData cause memory leak if I'm using UIWebView? I just don't get it. Thanks.

推荐答案

我也遇到了 iPhone 模拟器中 NSData 的 dataWithContentsOfURL: 泄漏问题.我发现当我使用其他方便的方法 (dataWithContentsOfURL:options:error:) 时，我不会出现内存泄漏.

I was also having trouble with leaks from NSData's dataWithContentsOfURL: in the iPhone simulator. I found that when I used the other convenience method (dataWithContentsOfURL:options:error:) I would not get the memory leak.

我的代码看起来像这样:

My code looked something like this:

NSURL *url = [NSURL URLWithString:urlString];
NSError *error = nil;
NSData *data = [NSData dataWithContentsOfURL:url
                                     options:0
                                       error:&error];

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