NSMutableArray append NSMutableArray

Question

I am trying to set the contents of my allArticlesArray, and then append the array with additional objects. Here is a snippet from my code to do so:

[self.allArticlesArray setArray:newsArray];
[self.allArticlesArray addObjectsFromArray:sportsArray];

newsArray and sportsArray are non-null (they each have five items), however, after this code runs, allArticlesArray is null. I am using ARC. What am I doing wrong? Thanks!

vikingosegundo · Accepted Answer · 2013-02-16 14:21:35Z

5

I assume you forgot to initialize allArticleArray

self.allArticlesArray = [NSMutableArray array];

[self.allArticlesArray setArray:newsArray];
[self.allArticlesArray addObjectsFromArray:sportsArray];

or a bit concise:

self.allArticlesArray  = [newsArray mutableCopy];
[self.allArticlesArray addObjectsFromArray:sportsArray];

answered Feb 16, 2013 at 14:21

vikingosegundo

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1 Comment

vikingosegundo Over a year ago

it is always causing confusion to new objective-c programmer, that sending a message to nil is not an error or raises an exception.

Lithu T.V · Accepted Answer · 2013-02-16 14:23:06Z

1

Use this

self.allArticlesArray=[NSMutableArray arrayWithArray:setArray];
[self.allArticlesArray addObjectsFromArray:sportsArray];

answered Feb 16, 2013 at 14:23

Lithu T.V

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