How to make an array of strings

I want to build an array of strings, that can point every time to a different string. I saw开发者_如何学编程 that I can use NSArray and NSMutableArray.

What is the difference between them?

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Straight from Apple:

NSArray

NSMutableArray

Main difference:

NSArray is non-mutable, meaning it cannot be altered once it is created and is usually faster and carries less of a memory footprint than its mutable counterpart.

NSMutableArray can be changed after it is created.

There are more differences than just that, but the documentation goes over them better than I can. I also recommend watching the free IOS Development lectures from Stanford available on iTunes. They go into the different data structures and how they can be used in much greater depth.

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NSMutableArray can be modified while NSArray cannot be modified after initializations (i.e addObjects, remove, etc..) If you need to add the strings after initializations go with mutable arrays

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With NSMutableArray, you can add objects and remove objects dynamicaly.
See : difference-b-w-nsarray-and-nsmutablearray

You can initialize it by :

NSMutableArray *ma = [[NSMutableArray alloc]init];
[ma addObject:myObject];