将 NSArray 复制到一个空的 NSArray 中

Question

I have a first NSArray firstArray and I do

[firstArray removeAllObjects];

after I want fill it with the content of an other array secondArray

is it right write in this way?

firstArray = secondArray; 

Answer 1

No, firstArray = secondArray will reassign the pointers, this is not the behavior you want. You want [firstArray addObjectsFromArray:secondArray]

Answer 2

Since the firstArray is an NSArray, you will want to do this instead:

firstArray = [NSArray arrayWithArray:secondArray];