UITableView crash on scroll or tap - issue with ARC?

mediaspree · April 2012

I am trying to create a simple UItableview app in a project utilizing ARC. The table renders just fine but if I try to scroll or tap a cell the app crashes.

Looking at the NSZombies (is that the proper way to say that?) I get the message "-[PlacesViewController respondsToSelector:]: message sent to deallocated instance 0x7c29240"

I believe this has something to do with ARC as I have successfully implemented UItableviews in the past but this is my first project using ARC. I know I must be missing something very simple.

PlacesTableViewController.h

@interface PlacesViewController : UIViewController
<UITableViewDelegate,UITableViewDataSource>

@property (nonatomic, strong) UITableView *myTableView;

@end

PlacesTableViewController.m

#import \"PlacesTableViewController.h\"

@implementation PlacesViewController

@synthesize myTableView;
- (void)viewDidLoad
{
    [super viewDidLoad];

    self.myTableView    =   [[UITableView alloc] initWithFrame:self.view.bounds   style:UITableViewStylePlain];

    self.myTableView.dataSource =   self;
    self.myTableView.delegate   =   self;

    [self.view addSubview:self.myTableView];
}
#pragma mark - UIViewTable DataSource methods

-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 1;
}

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return 100;
}



-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath  *)indexPath
{
    UITableViewCell *result = nil;

    static NSString *CellIdentifier = @\"MyTableViewCellId\";

    result =    [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if(result == nil)
    {
        result = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    }

    result.textLabel.text   =   [NSString stringWithFormat:@\"Cell %ld\",(long)indexPath.row];


    return result;
}
@end

Naughty_Ottsel · April 2012

By the looks of it your view controller is being released before it is meant to be. Wherever you delcare your placesViewController ensure that the iVar and/or the property are both strong and being alloc/inited.

I have had problems like this before, ARC is brilliant if not a bit over zealous

mediaspree · April 2012

Naughty_Ottsel;426141 said:
By the looks of it your view controller is being released before it is meant to be. Wherever you delcare your placesViewController ensure that the iVar and/or the property are both strong and being alloc/inited.

I have had problems like this before, ARC is brilliant if not a bit over zealous

I added in a dealloc method with an NSLog and, in fact, the view is being deallocated immediately. I tired adding strong as you say but still no help. In the end I "disabled ARC" for this part of the project and it works fine. But...I really don't think this is the proper solution...

BrianSlick · April 2012

1. It is very awkward for the file name and class name to be different. Get that sorted out.

2. If PlacesViewController is dying, then the problem is not IN PlacesViewController. The problem is wherever PlacesViewController is created.

Naughty_Ottsel · April 2012

BrianSlick;426191 said:
1. It is very awkward for the file name and class name to be different. Get that sorted out.

2. If PlacesViewController is dying, then the problem is not IN PlacesViewController. The problem is wherever PlacesViewController is created.

My thoughts, plus declaring the view controller, even if it is just an iVar in the .h file seems to sort the problem out as well

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UITableView crash on scroll or tap - issue with ARC?

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