Calling one selector from multiple UIButtons

Question

I know there are some questions on here that are very much like this but I am not finding the info I need. I am adding a grid of UIButtons to my view in a for loop. Each time a new button is created, I call addTarget:self action:@selector(doYourThing:) forControlEvent:UIControlEventTouchUpInside. If I only make one button, it works. But when I create a whole grid of buttons using the for loop, none of the buttons want to call the selector and instead I get EXC_BAD_ACCESS. Any suggestions? Thanks everyone.

- (void)viewDidLoad
{
    [super viewDidLoad];
    [titleLabel setText:[site title]];
    // Do any additional setup after loading the view from its nib.
    buttonArray = [[NSMutableArray alloc] initWithCapacity:250];
    int i = 0;
    int c = 0;
    int index = 0;
    for (c=0; c < [site columnCount]; c++) {
    for (i = 0; i < [site rowCount]; i++) {
        plotButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
        [plotButton addTarget:self action:@selector(buttonPressed:) forControlEvents:UIControlEventTouchUpInside];
        CGPoint origin = CGPointMake(60.0, 40.0);
        [plotButton setTitle:@"Plot" forState:UIControlStateNormal];
        [plotButton setFrame:CGRectMake(origin.x + (90.0 * c), origin.y + (45.0 * i), 90.0, 45.0)];
        [plotButton setTag:index];
        [buttonArray insertObject:plotButton atIndex:index];
        NSLog(@"%d", [plotButton tag]);
        index ++;
        [[self view] addSubview:plotButton];

        }
    }
}

Here's my for loop. idk if it's dumb to nest them like that but I'm making a grid of buttons and that seemed the sensible way to get rows and columns done. Anyways, thanks.

Added exception breakpoint. Got: Catchpoint 2 (throw)Pending breakpoint 1 - "objc_exception_throw" resolved.

You've likely got some error in your loop that constructs the buttons (since it's perfectly fine to call the same selector from several button). Please post the corresponding code. — DarkDust, Feb 04 '12 at 20:19
You need to [add an exception breakpoint](http://stackoverflow.com/questions/4961770/run-stop-on-objective-c-exception-in-xcode-4). Then trigger the error, copy the stack trace of the exception, edit your question, and paste in the stack trace. — rob mayoff, Feb 04 '12 at 20:29
do you release or nil-ot buttonArray somewhere else than dealloc? — vikingosegundo, Feb 04 '12 at 20:42
it's an ARC project so I haven't manually retained or released anything — geraldWilliam, Feb 04 '12 at 20:44

score 2 · Accepted Answer · answered Feb 04 '12 at 20:53

2

Your code works fine when I replace [site columnCount] and [site rowCount] by an integer. My guess is that you have a problem in one of those two methods.

answered Feb 04 '12 at 20:53

Jorge

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@geraldWilliam: if Jorges answer was what you needed then you should accept it. – Rok Jarc Feb 04 '12 at 22:56

score 0 · Answer 2 · answered Feb 04 '12 at 20:24

0

I guess you called the [UIButon buttonWithType:...] constructor and then you did release the button... But I'm just guessing. You should write the code here in order to be sure.

See you!

answered Feb 04 '12 at 20:24

Ricard Pérez del Campo

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Calling one selector from multiple UIButtons

2 Answers2