How to access array's index within another array in Objective-C

Question

I have this array and I want to access the first index inside another array.

(
    (
        1021,
        "String1,
        "<null>",
        "name1, name2",
        P,
        "String2",
        "Link1",
        "String3",
        "String4"
    ),
    (
        1025,
        "String1",
        "<null>",
        "name1, name2"
        P,
        "String2",
        "Link1",
        "String3",
        "String4"
    )
)

I tried to NSLog using this code:

NSLog(@"ID: %@", [[array objectAtIndex:0] objectAtIndex:0]);

But it doesn't work. It gives me an error saying:

-[__NSCFString objectAtIndex:]: unrecognized selector sent to instance

I just want to log the value 1021 in the first array of the first array.

dreamlax · Accepted Answer · 2013-01-02 03:40:03Z

6

The problem you are facing is that either array or the first element in array is a string.

Separate it out and step through with a debugger to make sure the array is being loaded and accessed correctly:

NSArray *array = [NSArray /* load from somwhere */];
NSLog(@"%@", array);

NSArray *innerArray = [array objectAtIndex:0];
NSLog(@"%@", innerArray);

NSNumber *objectId = [innerArray objectAtIndex:0];
NSLog(@"%@", objectId);

answered Jan 2, 2013 at 3:40

dreamlax

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Comments

JRG-Developer · Accepted Answer · 2013-01-02 03:40:22Z

1

This error indicates that the first object in array is an NSString.

Does any code add a string to said array?

If the first object in array were a dictionary, your code would be okay.

answered Jan 2, 2013 at 3:40

JRG-Developer

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