Question

in the .h file:

double var1;
NSString *Items[90];

in the .m file:

var1 = 1000;
NSString  *j = [NSString stringWithFormat:@"%g", var1 ];
Items[42] = [@" Per each " stringByAppendingString: j ];

see code above, the issue is that thru the app running i have a proc that needs this
Items[42] value however the value is not there anymore ( i didn’t erase it ) but
the cell is completely empty no null or spaces, as if the cell value was released.

on the other hand if i just place in Items[42] some string with no attached variable (like var1) (i.e. Items[42] = @”hello there”; )
then all is ok and the value of Items[42] is being preserved.

any idea why the cell when presented with a variable content (like var1 ) the cell lose content?

TIA

Answer 1

The reference counter of temporary string is zero. It would be destroyed at any time. There are three options to solve the problem:

1. Items[42] = [[@" Per each " stringByAppendingString: var1 ] retain];
   In non-ARC env, and remember to call [Items[42] release] later.
2. Declare Items as NSMutableArray* or NSArray*, i.e. NSMutableArray*
   Items. Which will automatically manage the reference count of its
   objects
3. Convert the program to use ARC

For global (static) constant strings, they have an infinite reference counter, and would never be destroyed.