Pass anything except sender in IBAction?

Question

In my view controller (viewDidLoad) I am populating an array defined in the view controllers header file with settings data (from an archive). I am using data from the array to write labels on buttons in the view, no problem so far.

I would like to pass one element of the array through an IBAction to add to the new view controller. I keep getting an error from within the IBAction

'NSInvalidArgumentException', reason: '-[NSCFString objectAtIndex:]: unrecognized selector sent to instance 0x5d230f0').

Here is the relevant part of my IBAction code:

-(IBAction)pushedTimer:(id)sender {
    if (!timerViewController) {
        timerViewController = [[TimerViewController alloc] init];
    }
    [timerViewController setPreset:[[settingsArray objectAtIndex:0] settingLength]];
    [[self navigationController] pushViewController:timerViewController animated:YES];
}

I was thinking that since the array is accessible in other methods, it should also work with the IBAction? The error leads me to believe that the IBAction can not determine that the settingsArray is really an array?

Thanks again.

Answer 1

Do instances in settingArray implement settingLength?

The question was itself a answer. I meant instances should implement settingLength.

Answer 2

How are you defining the settingArray? Are you creating a @property and @synthesizing it? If you're not, then you can't access that in allocated instances of that object, so your array will be nil. Also make sure to check what @alones said!

Answer 3

-[NSCFString objectAtIndex:]: unrecognized selector sent sounds like settingsArray is a NSString, not a NSArray.

Answer 4

I am not sure but here is what I think for this common problem:

Your array is garbaged already. What this means is that your array is dealloc somewhere in your code (by your over call of release or autorelease) then the string is allocated into the same memory area of the array. So that when the system try to call the object in that memory area, it is calling a NSString object not a NSArray object anymore.

You should double check all the release and autorelease of your array