Objective - c - NSMutableArray Array of Arrays

Question

I am developing an iphone app and I was wondering the following:

How do I initialise an NSMutableArray of NSMutableArrays to a certain size?

Sorry for the noob question

Wayne Hartman · Accepted Answer · 2014-01-04 17:16:12Z

11

NSMutableArray *array = [[NSMutableArray alloc] initWithCapacity:5];

for (int i = 0; i < 5; i++) {
   NSMutableArray *innerArray = [[NSMutableArray alloc] initWithCapacity:5];

   [array addObject:innerArray];
}

edited Jan 4, 2014 at 17:16

answered Jul 17, 2011 at 2:50

Wayne Hartman

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2 Comments

Nektarios Over a year ago

Note that initWithCapacity: is just setting an initial capacity. The array can continue to grow as much as you like (it's an optimization tool)

Nektarios Over a year ago

For someone that's new I don't think that's obvious. C arrays are certainly mutable and certainly don't have built-in expansion of available space

Nektarios · Accepted Answer · 2011-07-17 02:50:21Z

3

You don't set a maximum size. You just keep addObject:'ing to them

answered Jul 17, 2011 at 2:50

Nektarios

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1 Comment

Farini Over a year ago

Exactly, NSMutableArray don't need initWithCapacity. Never.

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