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POWhile switching view on navigation bar, how to quit NSOperationQueue thread safely without EXC_BAD_ACCESS error
 

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  1. POWhile switching view on navigation bar, how to quit NSOperationQueue thread safely without EXC_BAD_ACCESS error
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    <p>I am using an UITableView to show some string messages, and I use NSOperationQueue to hold an customized NSOperation which fetchs message in background thread. After one message fetched successfully, customized NSOperation will notify the UITableView controller to show it.</p> <p>If I click back button on the navigation bar to switch from the UITableView to other view after all message loaded, every thing is OK. But, if i click the back button while some message still loading, an EXC_BAD_ACCESS is throw. I have checked that the exception happened while customized NSOperation notify UITableView controller with <code>performSelectorOnMainThread</code> method. Sound like the target UITableView controller is not invalid after view switched, but I think Navigation Controller will hold the view controller instance. May I know how to resolve this issue? Thanks.</p> <p>Customized operation is initialized in the UITableView controller with following code:</p> <pre><code>StatusMessageLoadingOperation *operation = [[StatusMessageLoadingOperation alloc] initWithData:person messageArray:cachedStatusMessages target:self action:@selector(didFinishStatusMessages:)]; [operationQueue addOperation:operation]; [operation release]; </code></pre> <p>The customized NSOperation class will update UITableView with following code:</p> <pre><code>- (void)main{ for (int i = 0; i &lt; [[person statusMessages] count]; i++) { [target performSelectorOnMainThread:action withObject:messageArray waitUntilDone:NO]; } } </code></pre>
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