Question

I have this situation:

- (void) foo {
    NSLog(@"Print this: %@", [MyObject classString]);
}

// So in MyObject.m I do
@implementation MyObject

+ (NSString *) classString {
     return [OtherObject otherClassString];   //The Warning "Potential leak..." is for this line
}
@end

// Finally in OtherObject
@implementation OtherObject

+ (NSString *) otherClassString {
    NSString *result = [[NSString alloc] initWithString:@"Hello World"];
    return result;
}
@end

In the beginning, I had a warning for otherClassString and for classString but with this way for otherClassString this work.

Now my problem is in classString in the MyObject. I tried a lot of things, but this warning is always shown. Can’t I call a class method inside a class method?

Answer 1

Your +otherClassString creates an object with retain count 1 and returns it. This is used as return value for +classString as well.

If your methods don’t begin with init, new, or copy, you should return autoreleased objects. Everywhere where yours (as is) are used, they’ll be expected to return an autoreleased object.

+ (NSString *) otherClassString {
    NSString *result = [[[NSString alloc]
                            initWithString:@"Hello World"]
                            autorelease];
    return result;
}