Unlike java, Obj-C does not have the concept of class variable.
Your static variable is a classic C variable, and C variable are not
automatically initialized to NULL.
The first time you call init, relationshipMatch may contains anything
and may not be NULL, and so it will never be properly initialized.
Second error, you do not retain you variable. You create it using a
convenient initializer wich returns an autoreleased array. At the end
of the event loop, your array is released, and as you never retained
it, it is deallocated.
Le 1 sept. 08 à 20:29, Richard Good a écrit :
I'm just learning Objective C and need to understand how to declare
and use a static NSArray.
I think I may be confusing the Java concept of static and Objective
C's concept.
What I want is how to use the Java idea of a class static variable
in Objective C
Here's the code I'm trying to use:
//class name is Person
static NSMutableArray* relationshipMatch;
-(id)init {
[super init];
if (relationshipMatch==nil)
[Person initRelationshipMatch];
return self;
}
+ (void) initRelationshipMatch {
relationshipMatch = [NSArray arrayWithObjects:
@"abc",@"def",@"hig",nil] ;
}
When I try to access the array using
NSString* aString = [relationshipMatch objectAtIndex:1];
I get
*** Terminating app due to uncaught exception
'NSInvalidArgumentException', reason: '***
Any help would be appreciated.
Richard Good
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