how to define 2x2 array in ios?

Question

how to define 2x2 or 3X.. array in ios? like this

[name=john , age=21 , num=1]
[name=max , age=25 , num=2]
[name=petter , age=22 , num=3]

with columns in NSMutableArray you can only add rows with objects; i want this array[][]

You can do it all in C with this kind of notation [][]. – Robert Mar 18 '11 at 11:44 — Robert, Mar 18 '11 at 11:44

score 6 · Accepted Answer · answered Mar 18 '11 at 11:41

6

Looking at your example, I wouldn't do it with arrays, or not just arrays. I'd have an array of dictionaries or an array of custom objects with the properties name, age and num. With dictionaries:

NSArray* theArray = [NSArray arrayWithObjects:
    [NSDictionary dictionaryWithObjectsAndKeys:
        @"john", @"name",
        [NSNumber numberWithInt: 21], @"age",
        [NSNumber numberWithInt: 1], @"num",
        nil],
    [NSDictionary dictionaryWithObjectsAndKeys:
        @"max", @"name",
        [NSNumber numberWithInt: 25], @"age",
        [NSNumber numberWithInt: 2], @"num",
        nil],
    [NSDictionary dictionaryWithObjectsAndKeys:
        @"petter", @"name",
        [NSNumber numberWithInt: 22], @"age",
        [NSNumber numberWithInt: 3], @"num",
        nil],
    nil];

answered Mar 18 '11 at 11:41

JeremyP

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Thanks for your answer. +1 for that.. i am confused to get that value back.. could you update that please.. it may help some one like me – vinothp Aug 07 '12 at 10:26
1

@Vinoth: To get the age of the middle one: `[[theArray objectAtIndex: 1] objectForKey: @"age"]` – JeremyP Aug 07 '12 at 10:32
Thanks for your prompt response.. Cheers – vinothp Aug 07 '12 at 10:35

score 3 · Answer 2 · edited May 23 '17 at 12:26

3

How to declare a two dimensional array of string type in Objective-C? might give you an idea

edited May 23 '17 at 12:26

Community

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answered Mar 18 '11 at 11:36

visakh7

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i saw that but how can i export values? – mamrezo Mar 18 '11 at 11:41

score 2 · Answer 3 · answered Mar 18 '11 at 11:41

So many ways ...

NSMutableArray *array = [[NSMutableArray alloc] init];

NSMutableDictionary *person = [[[NSMutableDictionary alloc] init] autorelease];
[person setObject:@"john" forKey:@"name"];
[person setObject:[NSNumber numberWithInt:21] forKey:@"age"];
...

[array addObject:person];

... or create your custom class, which does hold all person data, or struct, or ... Depends on your goal.

score 0 · Answer 4 · answered Mar 18 '11 at 11:55

It looks like you should be create a proper data storage class to store this in, rather than a dictionary or something like that.

e.g.

    @interface Person : NSObject {

    }

    @property (nonatomic, copy) NSString* Name;
    @property  int age;
    @property  int num;

    @end

Then create your person instances and store them in an array. You may wich to create some connivence methods first. e.g.

[[NSArray arrayWithObjects:[Person personWithName:@"Bob",Age:1 Num:3],
                             [Person personWithName:@"Bob",Age:1 Num:3],
                              [Person personWithName:@"Bob",Age:1 Num:3],nil];

Its much clearer.

how to define 2x2 array in ios?

4 Answers4