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PO-[CFString hash]: message sent to deallocated instance
 

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    <p>I'm trying to fetch <code>EKEvent</code>s from the Event Store to populate a <code>UITableView</code> and display a month list view.</p> <p>Basically it works and I'm doing it like this:</p> <pre><code>- (void) reloadEvents { for ( NSString *entry in self.calendarA ) { NSMutableArray *tempArray = [[[NSMutableArray alloc] init] autorelease]; [tempArray addObjectsFromArray:[appDelegate.eventStore eventsMatchingPredicate:[appDelegate.eventStore predicateForEventsWithStartDate:[NSDate fromString:entry] endDate:[[NSDate fromString:entry] midnight] calendars:nil]]]; [tempArray addObjectsFromArray:[self initializeItems:[NSDate fromString:entry] withEndDate:[[NSDate fromString:entry] midnight]]]; [tempArray sortUsingDescriptors:[NSArray arrayWithObject:[[[NSSortDescriptor alloc] initWithKey:@"startDate" ascending:YES] autorelease]]]; [[self.calendarD objectForKey:entry] addObjectsFromArray:tempArray]; } dispatch_async(dispatch_get_main_queue(), ^(void) { [self redrawTableCells]; }); } </code></pre> <p><code>reloadEvents</code> is called from within a</p> <pre><code>dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^(void) { [self reloadEvents]; }); </code></pre> <p>as fetching events happens synchronously and it locks the UI for that time, I'm using GCD. The <code>NSDate</code> parts are my own categories on <code>NSDate</code>. </p> <p>Now, when my view controller loads, events are fetched from the Event Store and displayed correctly. The view controller also listens for <code>EKEventStoreChangedNotification</code> and that's where my app crashes. When I change an event outside my app it receives a notification and tries to reload the event data, but then...</p> <blockquote> <p><code>*** -[CFString length]:</code> message sent to deallocated instance 0x666f530</p> </blockquote> <p><strong>EDIT</strong> I've changed <code>reloadEvents</code> to the following:</p> <pre><code>- (void) reloadEvents { NSArray *daysArray = [[self.calendarD allKeys] sortedArrayUsingSelector:@selector(compare:)]; for ( NSString *entry in daysArray ) { NSMutableArray *tempArray = [[NSMutableArray alloc] init]; [tempArray addObjectsFromArray:[appDelegate.eventStore eventsMatchingPredicate:[appDelegate.eventStore predicateForEventsWithStartDate:[NSDate fromString:entry] endDate:[[NSDate fromString:entry] midnight] calendars:nil]]]; [tempArray addObjectsFromArray:[self initializeItems:[NSDate fromString:entry] withEndDate:[[NSDate fromString:entry] midnight]]]; [tempArray sortUsingDescriptors:[NSArray arrayWithObject:[[[NSSortDescriptor alloc] initWithKey:@"startDate" ascending:YES] autorelease]]]; [[self.calendarD objectForKey:entry] addObjectsFromArray:tempArray]; [tempArray release]; } dispatch_async(dispatch_get_main_queue(), ^(void) { [self redrawTableCells]; }); } </code></pre> <p>and with this, the app doesn't crash anymore. Seems like something changed <code>calendarA</code> and therefore the entry was already deallocated (which, after having found the cause of the problem, is absolutely logical).</p>
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    1. USJosh Caswell
    1. USMartin Hasenbein
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    1. COI don't see any issues with code you've posted. I see you have set environment variable NSZombieEnabled to YES, check this SO question http://stackoverflow.com/questions/7940198/exc-bad-access-message-sent-to-deallocated-instance-but-im-using-arc/7940254#7940254, look for chown user's answer and try debugging . If possible can you create a small project with this code (that crashes) and post it here.
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      1. US0x8badf00d
    2. COIs it possible that something running in another thread is changing calendarA? That would mess up the enumeration.
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      1. USFlyingdiver
    3. COThere's not enough code here to diagnose.
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      1. USJames
 

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