Add other object to NSArray

Question

I made a small code

NSArray* _options = [NSArray arrayWithObjects:[NSDictionary dictionaryWithObjectsAndKeys:[UIImage    imageNamed:@"2"],@"img",name,@"text"
                                   , nil],nil];

Now, I want add other object to _options. What should i do? I make more test but no success. Thank for all

Bryan Chen · Accepted Answer · 2014-03-25 02:32:08Z

2

you can use [NSArray arrayByAddingObject:]

_options = [_options arrayByAddingObject:object];

or change _options to NSMutableArray

NSMutableArray *_options = [NSMutableArray arrayWithObjects:[NSDictionary dictionaryWithObjectsAndKeys:[UIImage    imageNamed:@"2"],@"img",name,@"text"
                                   , nil],nil];
[_options addObject:object];

and you may want to use modern syntax

NSMutableArray *_options = [@[@{@"img":[UIImage imageNamed:@"2"],@"text":name}] mutableCopy];
[_options addObject:object];

edited Mar 25, 2014 at 2:32

answered Mar 25, 2014 at 2:26

Bryan Chen

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Comments

klcjr89 · Accepted Answer · 2014-03-25 02:40:23Z

2

NSArray does not allow any changes to be made; you can use an NSMutableArray instead like this:

NSMutableArray *mutable = [_options mutableCopy];

[mutable addObject:yourObject];

NSDictionary is same in that it can't be mutated.

edited Mar 25, 2014 at 2:40

klcjr89

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answered Mar 25, 2014 at 2:29

Aeli.li

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Comments

Snaker · Accepted Answer · 2014-03-25 02:27:35Z

1

You can't add objects to a NSArray, to do so, you need a NSMutableArray.

However, you can add objects to NSArray when creating it with : arrayWithObjects

answered Mar 25, 2014 at 2:27

Snaker

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Comments

klcjr89 · Accepted Answer · 2014-03-25 02:34:13Z

1

First, create an NSMutableArray, as you can make changes to it as you see fit later throughout your code:

NSMutableArray *newOptions = [NSMutableArray alloc]init];

[newOptions setArray:_options];

[newOptions addObject:yourObject];

edited Mar 25, 2014 at 2:34

answered Mar 25, 2014 at 2:23

klcjr89

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3 Comments

Bryan Chen Over a year ago

NSArray does not have method addObject: I downvote it because this is wrong answer.

Bryan Chen Over a year ago

I want to downvote it again. newOptions = _options doesn't magically change _options to NSMutableArray

Bryan Chen Over a year ago

another downvote, you should use setArray: not addObject:

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