NSMutableArray in NSMutableArray as a single object

Question

I am trying to add NSMutableArray in another NSMutableArray. But what I am trying to do is nested arrays.

My current code is:

  NSMutableArray *array1 = [NSMutableArray arrayWithObjects: @"Red", @"Green", @"Blue", @"Yellow", nil];
  NSMutableArray *array2 =[[NSMutableArray alloc] init];
  [array2 addObject:array1];

This code is adding 4 objects in array2 but I want it to add array1 as single object.

Edit: This code is working I know but in my case in XCode something is wrong with initializing and it is adding 4 objects. I still could not figure it out. So this piece of code is working properly. So the problem was about initialization in a for loop.

You might need to use NSDictionary for what you are expecting. When you assign array to an array, the result will be the same. — Dhrumil
– Dhrumil, Commented Jun 19, 2014 at 6:35
are you sure its adding 4 objects in array2 ? as the code working fine for me, try logging count of array2. — Viper
– Viper, Commented Jun 19, 2014 at 6:44
nothing wrong with your code if you want to add array1 as single object. — Quang Hà
– Quang Hà, Commented Jun 19, 2014 at 6:57

gsach · Accepted Answer · 2014-06-19 06:53:14Z

3

I copy/pasted your code, and it adds one object to array2, not four.

Printing description of array2:
<__NSArrayM 0xc46c7b0>(  <-- THIS ARRAY HAS 1 OBJECT
    <__NSArrayM 0xc488770>( <-- THIS ARRAY HAS 4 OBJECTS
        Red,
        Green,
        Blue,
        Yellow
    )
)

You may be are getting confused by the fact that printing the description, prints the contents of the inner array also.

answered Jun 19, 2014 at 6:53

gsach

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1 Comment

birdcage Over a year ago

The problem was about initialization in a for loop.I have edited the question description also. Thanks!

Bernhard Grabowski · Accepted Answer · 2014-06-19 06:37:55Z

0

Try:

NSMutableArray *array2 =[[NSMutableArray alloc] initWithArray:array1];

answered Jun 19, 2014 at 6:37

Bernhard Grabowski

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12 Comments

birdcage Over a year ago

is this working with adding many arrays? I mean I will add array3,array4,array5 ... to array2.

Bernhard Grabowski Over a year ago

Yes it does. Try: [array2 addObject: array3]; [array2 addObject: array4];

gsach Over a year ago

This is not different at all from the original question. It is incorrect

gsach Over a year ago

this answer will confuse other people in the future. The reason it works is not the change he suggested.

gsach Over a year ago

Start a new project and copy paste this code. Tell me if that persists

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Almudhafar · Accepted Answer · 2014-06-19 06:49:49Z

0

i am using this and its working

NSArray *array1 = @[array2, array3, ...];

answered Jun 19, 2014 at 6:49

Almudhafar

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