iphone - 启用 ARC 的 TWTweetComposeViewController 内存泄漏

Question

尽管在该文件上启用了 ARC，但我有以下代码导致泄漏:

TWTweetComposeViewController *tweetViewController = [[TWTweetComposeViewController alloc] init];

[tweetViewController setInitialText:[self facebookAndTwitterStatus]];

tweetViewController.completionHandler = ^(TWTweetComposeViewControllerResult result) {
    if(result == TWTweetComposeViewControllerResultDone) {
        // the user finished composing a tweet
    } else if(result == TWTweetComposeViewControllerResultCancelled) {
        // the user cancelled composing a tweet
    }
    [self dismissViewControllerAnimated:YES completion:nil];
};

[self presentViewController:tweetViewController animated:YES completion:nil];

[self hideSettingsPopover];

显然我没有发布，但我怎样才能摆脱这种泄漏？

Answer 1

在你的 TwTweetViewController 变量 tweetViewController 上使用 __block并在完成处理程序中将 tweetViewController 设置为 nil。

**__block** TweetComposeViewController *tweetViewController = [[TWTweetComposeViewController alloc] init];

[tweetViewController setInitialText:[self facebookAndTwitterStatus]];

tweetViewController.completionHandler = ^(TWTweetComposeViewControllerResult result) {
    if(result == TWTweetComposeViewControllerResultDone) {
        // the user finished composing a tweet
    } else if(result == TWTweetComposeViewControllerResultCancelled) {
        // the user cancelled composing a tweet
    }
    [self dismissViewControllerAnimated:YES completion:nil];
    **tweetViewController = nil;**
};

__block 复制你的 tweetViewController 并在你将它设置为 nil 时释放它。这在过渡到 ARC 发行说明中进行了解释。 http://developer.apple.com/library/ios/#releasenotes/ObjectiveC/RN-TransitioningToARC/_index.html

不确定为什么您的问题被否决。