NSMutableArray附加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!

Answer 1

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];

Answer 2

Use this

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