Re: Changing content of object inside NSMutableArray
Re: Changing content of object inside NSMutableArray
- Subject: Re: Changing content of object inside NSMutableArray
- From: Ken Thomases <email@hidden>
- Date: Fri, 3 Jul 2009 22:42:17 -0500
On Jul 2, 2009, at 5:36 PM, Agha Khan wrote:
I have saved some objects inside GameArray (type NSMutableArray) and
I would like to change of content of an object inside that array.
GameObj is type of UIView so it has a frame.
GameObj* p = [GameArray objectAtIndex:0];
p.frame = frame;
This works, but this is not changing the content inside the GameArray.
What do you mean it "is not changing the content inside the
GameArray"? By what means are you detecting this?
It is most definitely the case that the above code snippet is changing
the frame of the object at index 0 of the array. An array contains
references to objects. It doesn't really contain the objects
themselves. So, the pointer 'p' in your snippet is a reference to the
same object that the array has a reference to. There's no way for the
change you make through 'p' to not affect the object referred to by
the array, since they are the same object.
If you think it is not changing the object in the array, then you are
confused or mistaken.
Regards,
Ken
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