Issues storing and retrieving NSArray

[jhockman]

I have a viewController that I want to retrieve an NSMutableArray from userdefaults then under the viewWillDisappear i have it write a new NSArray to userdefaults.

VC.h

NSUserDefaults *defaults;
NSMutableArray *array;

VC.m

viewDidLoad:
defaults = [NSUserDefaults standardUserDefaults];
array = [NSMutableArray arrayWithArray:[defaults arrayForKey:@"CONTACTS"]];

other tableView methods that actually modify the array object.

viewWillDisappear:
[defaults setObject:array forKey:@"CONTACTS"];




There are no errors and the program runs fine the first time the view is loaded. The problem is if I go back to the main view and open it again the array does not get loaded from userdefaults. It just defaults to an array with count of 0. if I NSLog(@"%i", [array count] there's no problem but the minute I try to do any sort of enumerating either with a for(NSObject *object in array) or for(int x =0; x < [array count]; x++) it crashes even though with a count of 0 it should just pass right over the enumeration. Not to mention the fact that the array isn't being saved or loaded properly.

Any ideas?

[jhockman]

Oh I should add that the array is of NSString objects.

[smasher]

Did you retain "array" in any way? The method arrayWithArray returns an autoreleased array, which will probably be destroyed shortly after viewDidLoad.

Beyond that, try logging array in viewWillDisappear to see if you're getting what you expect.

NSLog(@"%@",array);

EDIT: Also note that viewDidLoad is not viewWillAppear - the method viewDidLoad might only get run once, or it might run many times if you contantly alloc and dealloc new controllers of this type or if low memory causes the view to get unloaded.

[jhockman]

I tried that, but I must have messed it up so how because now when I try it it works perfectly. You have got to freaking kidding me lol

Thanks!

[jhockman]

Oh nevermind. It works the firs two times, but the 3rd time i open the view it crashes.

[jhockman]

Okay so now I load it from defaults. It loads no problem. But if I try to enumerate it and take one of the NSString objects and compare

if([object intValue] == 5])

it throws an exception saying that [UICGColor intValue] unrecognized selector sent. How is it seeing those objects as UICGColors instead of NSStrings?

[jhockman]

In case anyone is wondering the final reason was because the second time I moved away from the view it was trying to release the NSUserDefaults object but it had already been release because of the autorelease mechanism. As far as I can tell that's what it was.