iOS How Array objects separated by commas convert into string?

Question

I have an array named as child_list like child_list: "9,8,21,22,20,24,25", take it in NSString at index 0 when I convert it into string its work but when i use NSMutableArray it crashed, I don't know why.

My code is here:

if([theDictionary objectForKey:@"child_list"])
    {
        NSString *str = [[theDictionary objectForKey:@"child_list"]objectAtIndex:0];
        NSLog(@"Child List %@",str);
        _child_list = [[NSMutableArray alloc ]initWithObjects: [str componentsSeparatedByString:@","], nil];
    }

When break point come on str it show result when it comes on _child_list it crashed.

does NSLog(@"Child List %@",str); this log prints "9," . or just "9" — Vaisakh
– Vaisakh, Commented Apr 23, 2015 at 4:48
Create child_list as NSMutableArray. it will work perfectly. no need to change anything. — Ashok Londhe
– Ashok Londhe, Commented Apr 23, 2015 at 4:56
how about trying like that: _child_list = [str componentsSeparatedByString:@","].mutableCopy — Kyokook Hwang
– Kyokook Hwang, Commented Apr 23, 2015 at 5:06

bhavesh · Accepted Answer · 2015-04-23 05:09:55Z

1

Use initWithArray method while allocating _child_list NSMutableArray

 if([theDictionary objectForKey:@"child_list"])
    {
        NSString *str = [[theDictionary objectForKey:@"child_list"]objectAtIndex:0];
        NSLog(@"Child List %@",str);
        _child_list = [[NSMutableArray alloc ] initWithArray:[str componentsSeparatedByString:@","]];
    }

edited Apr 23, 2015 at 5:09

answered Apr 23, 2015 at 4:54

bhavesh

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2 Comments

rmaddy Over a year ago

What's the , nil for at the end? arrayWithArray: only takes one parameter. And my not simply use mutableCopy on the array?

riz Over a year ago

@bhavesh taking arraywitharray like your code its occur an error

rmaddy · Accepted Answer · 2015-04-23 05:01:46Z

0

Please share what your log returns and the dictionary you used.. The code [str componentsSeparatedByString:@","] returns an Array. So, when you're allocating a mutable array, you're creating array of array... Instead using initWithObjects, use initWithArray method and pass [str componentsSeparatedByString:@","] to it.

edited Apr 23, 2015 at 5:01

rmaddy

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answered Apr 23, 2015 at 4:48

Tejvansh

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2 Comments

riz Over a year ago

like that _child_list = [[NSMutableArray alloc ]initWithArray: [str componentsSeparatedByString:@","], nil];

Tejvansh Over a year ago

No, use it this way.. _child_list = [[NSMutableArray alloc ]initWithArray: [str componentsSeparatedByString:@","]];

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