[問題] retain count的問題

[Gsus (肉元，吉米，助教)]

我有一個tableViewController，然後我在leftBarButtonItem上加了個Button

這個button被clicked以後就會觸發下列method

- (void)addPost:(id)sender {

        PostViewController *postViewController = [[PostViewController alloc]
                                                        initWithUserID:userID];

        postViewController.delegate = self;

        UINavigationController *postNavigationController =
                [[UINavigationController alloc]
                        initWithRootViewController:postViewController];

        [self.tabBarController presentModalViewController:postNavigationController animated:YES];

        [postViewController release];
        [postNavigationController release];
}

<我遇到的第一個問題是>

每當我dismissModalViewController (也就是上述的postViewController)後

console就出現 EXEC_BAD_ACCESS

如果我comment最後兩行code中任一行，
(也就是[postViewController release] or [postNavigationController release])

就不會出現 EXEC_BAD_ACCESS

所以我就想看看retain count到底是多少

於是我就加入了一些NSLog

- (void)addPost:(id)sender {

        PostViewController *postViewController = [[PostViewController alloc]
                                                        initWithUserID:userID];
        NSLog(@"retain count = %d", [postViewController retainCount]);

        postViewController.delegate = self;

        NSLog(@"retain count = %d", [postViewController retainCount]);

        UINavigationController *postNavigationController =
                [[UINavigationController alloc]
                        initWithRootViewController:postViewController];

        NSLog(@"retain count = %d", [postViewController retainCount]);
        NSLog(@"postNavigationController retain count = %d",
                [postViewController retainCount]);

        [self.tabBarController presentModalViewController:postNavigationController animated:YES];

        NSLog(@"retain count = %d", [postViewController retainCount]);
        NSLog(@"postNavigationController retain count = %d",
                [postViewController retainCount]);

        [postViewController release];

        NSLog(@"retain count = %d", [postViewController retainCount]);
        NSLog(@"postNavigationController retain count = %d",
                [postViewController retainCount]);

        //[postNavigationController release];
}

沒想到結果竟然是

2010-09-28 10:02:29.630 postViewController retain count = 1
2010-09-28 10:02:29.630 postViewController retain count = 1
2010-09-28 10:02:29.631 postViewController retain count = 3
2010-09-28 10:02:29.632 postNavigationController retain count = 3
2010-09-28 10:02:29.690 postViewController retain count = 26
2010-09-28 10:02:29.690 postNavigationController retain count = 26
2010-09-28 10:02:29.691 postViewController retain count = 25
2010-09-28 10:02:29.691 postNavigationController retain count = 25

怎麼會跳到26這麼多啊@@

我看到都傻了.....

只好把問題放上來問問有沒有一點提示了QQ

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→ Gsus:找出第一個問題了，發現如果comment"某些"code都可以解決
→ Gsus:BAD_ACCESS的時候，似乎通常代表是其他地方的問題
→ Gsus:以我這個例子來說，是在postViewController的dealloc裡頭多
→ Gsus:release了不該release的東西，不過retain count的部份還是qq
→ zonble:出現 bad access 的話，用 NSZombie 會比較好找
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