Databases
StackOverflow2013
Postsdbo
POEXC_BAD_ACCESS when dragging UIScrollView
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POEXC_BAD_ACCESS when dragging UIScrollView
    primarykey
    data
    text
    <p>In a controller I'm creating a UIScrollView. I'm trying to set this viewcontroller as the UISCrollview delegate and to implement the delegate's method in order to add (later) a UIPageControl.</p> <p>I've read a bit, and found <a href="https://stackoverflow.com/questions/3686803/uiscrollview-exc-bad-access-crash-in-ios-sdk">this link</a>, <a href="https://stackoverflow.com/questions/13082157/uiscrollview-does-not-work-with-exc-bad-access">this other link</a> and other here on SO, and some useful tutorial all around the web, but I don't understand what I'm doing wrong. Everytime a scroll the UIScrollView, the app crashes with an EXC_BAD_ACCESS error.</p> <p>Here's my .h file</p> <pre><code>#import &lt;UIKit/UIKit.h&gt; @interface StatsViewController : UIViewController &lt;UIScrollViewDelegate&gt; { UIScrollView *scrollView; UIPageControl *pageControl; } @end </code></pre> <p>Then in my .m file, I'm creating the scrollview and trying to define the delegate method like this:</p> <pre><code>- (void)viewDidLoad { [super viewDidLoad]; NSInteger boxWidth = self.view.frame.size.width; NSInteger boxHeight = 412; scrollView = [ [UIScrollView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, boxHeight)]; scrollView.pagingEnabled = TRUE; scrollView.delegate = self; NSInteger numberOfViews = 2; StatBreatheCounter *breatheCounter = [ [StatBreatheCounter alloc] init]; breatheCounter.view.frame = CGRectMake(0, 0, boxWidth, boxHeight); [scrollView addSubview:breatheCounter.view]; BreatheLocationViewController *breatheLocation = [ [BreatheLocationViewController alloc] init]; breatheLocation.view.frame = CGRectMake(320, 0, boxWidth, boxHeight); [scrollView addSubview:breatheLocation.view]; scrollView.contentSize = CGSizeMake(self.view.frame.size.width * numberOfViews, boxHeight); [self.view addSubview:scrollView]; </code></pre> <p>}</p> <pre><code> - (void)scrollViewDidScroll:(UIScrollView *)sender { NSLog(@"RUNNING"); } </code></pre> <p>...but every time I slide on the scroll view, the app is crashing. Now, I'm quite a n00b on Ojective-C, but I feel I'm missing something. Browsing around everything points on the fact that the delegate could be deallocated early, and when the user trigger the action, no one is handling the method (sorry for the explanation :)). ...but if the delegate it's the viewcontroller itself, how could it be deallocated?</p> <p>As you can see, I'm quite confused :( Any help would be really appreciated</p> <p>-- EDIT: I'm going to include here the solution founded thanks with your comments and answer. When I posted my question I was so convinced that the error was coming from the way I was creating the UIScrollView and setting its delegate that I didn't realize that the problem was (as everything was suggesting, btw :)) I was allocating the StateViewController in its parent without declaring any "strong" reference to it (again, sorry for the explanation, I'm really a n00b in this). Thanks a lot for your helping in pointing me on the right direction</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USCommunity
    1. USSr.Richie
    plurals
    1. PL
      singulars
      1. LTLinked
    2. PL
      singulars
      1. LTLinked
    3. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POEXC_BAD_ACCESS when dragging UIScrollView
      1. This table or related slice is empty.
      1. VTUpMod
    1. COStacktrace please!
      singulars
      1. POEXC_BAD_ACCESS when dragging UIScrollView
      1. This table or related slice is empty.
    2. COThe crash could be in `viewDidLoad` of `BreatheLocationViewController`. Only a stacktrace can verify that. Can you please copy the crash message in console and paste it here.
      singulars
      1. POEXC_BAD_ACCESS when dragging UIScrollView
      1. USiDev
    3. CO@ACB thanks for your help.... but if a comment the line where i'm setting "scrollView.delegate = self", everything works, so I don't think the problem is in the other view controllers. Sorry for my extreme ignorance, but where can I find the information you suggest me to copy? In the debug navigator I've lot of info, is it enough the part relevant to thread 1, 0 objs_msgSend?
      singulars
      1. POEXC_BAD_ACCESS when dragging UIScrollView
      1. USSr.Richie
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload