Weak Property in Objective C

Asked Nov 26 '15 at 08:07

Active Nov 26 '15 at 08:07

Viewed 49 times

I have 2 properties that are weak, declared as follows :

@property (nonatomic, weak) NSString *weakProperty;
@property (nonatomic, weak) NSMutableString *weakMutableProperty;

- (void)testNonMutable
{
    NSString *name = @"ABC";
    self.weakProperty = name;    
    name = nil;

    NSLog(@"Printing weak property %@",self.weakProperty);
}

- (void)testMutable
{
     NSMutableString *name = [NSMutableString stringWithString:@"ABC"];
     self.weakMutableProperty = name;
     name = nil;

     NSLog(@"Mutable : Printing weak property %@",self.weakMutableProperty);
}

I was expecting the NSLog statement to print nil , but it prints ABC in the first method. However it does in the second method. Can someone please help me ?

asked Nov 26 '15 at 08:07

Preetham Baliga

2

OP: Pay attention to the "literals and constants" part of that answer... – trojanfoe Nov 26 '15 at 08:12
3

i am not able to mark this question as duplicate, so: http://stackoverflow.com/questions/11107729/why-do-weak-nsstring-properties-not-get-released-in-ios – André Slotta Nov 26 '15 at 08:13
Actually, that's a better duplicate, @AndréSlotta, thanks. – jscs Nov 26 '15 at 08:16
@trojanfoe, would you care to change the dupe target to André Slotta's link? – jscs Nov 26 '15 at 08:16
1

@JoshCaswell but your thread has a more complete answer i think... ;) – André Slotta Nov 26 '15 at 08:17
@Josh Caswell Thanks :) – Preetham Baliga Nov 26 '15 at 08:17
I agree; it covers this question too. – trojanfoe Nov 26 '15 at 08:17
Yeah, I guess that's true, @AndréSlotta; it's interesting that there's [another long, well-written answer by David Röhnqvist](http://i.stack.imgur.com/1H9sV.png) at your link, but unfortunately he's deleted it. – jscs Nov 26 '15 at 08:18
Glad I could help, @PreethamBaliga. – jscs Nov 26 '15 at 08:19
Can't add answer now, so just write comment: `@"ABC"` is constant string it will never be released. In second method you need use `@autoreleasepool` or `[[NSMutableString alloc] initWithSting:]` – Cy-4AH Nov 26 '15 at 08:19

Weak Property in Objective C

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