Changing object at NSMutable Array of Objects

Question

I have an NSMutableArray (called postArray) of Objects Post.

The object Post is:

#import <Foundation/Foundation.h>
#import <MapKit/MapKit.h>

@interface PostAnnotation : NSObject <MKAnnotation>

@property NSInteger annotationID;
@property NSInteger postID;
@property (nonatomic, copy) NSString* profile;
@end

How I am going to change the value of the postArray.postID at object i? Thanks in advance!

You just change it. If you don't have a pointer to it stashed, access the array with objectAtIndex to fetch the pointer. Keep in mind that NS(Mutable)Array does not contain copies of the objects, but rather pointers to the original objects you inserted. — Hot Licks
– Hot Licks, Commented Jul 20, 2013 at 17:28

danielbeard · Accepted Answer · 2013-07-20 17:23:52Z

1

One alternative is to cast the object from the array:

((PostAnnotation*)[postArray objectAtIndex:index]).postId = 1234;

Otherwise, you can use this method:

PostAnnotation *postAnnotation = postArray[index]
postAnnotation.postId = 1234;

answered Jul 20, 2013 at 17:23

danielbeard

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1 Comment

BlackM Over a year ago

I was trying [postArray objectAtIndex:index]).postId = 1234;. Thank you very much!!

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