Question

For C I would init an array like this:

NSInteger x[3][10]; That works.

Below I have a one dim array that works. Would like to move all of this to a 2 dim array, How do I init it? So in other words take the code below and make it work with 2 dimensions.

NSMutableArray *SRData;

SRData = [[NSMutableArray alloc] init];


NSMutableDictionary *SRRow;

SRRow = [[NSMutableDictionary alloc] init];

[SRRow setObject:@"Read" forKey:@"Descr"];
[SRRow setObject:@"Read2.png" forKey:@"Img"];

[SRRow setObject:@"Read the codes" forKey:@"Det"];

[SRData addObject:SRRow] ;   

[SRRow release];

Answer 1

In Objective-C, you just have to have an array of arrays to get the second dimension. To my knowledge, there is no shorthand, so you’re stuck doing something like the following:

NSMutableArray *firstDimension = [[NSMutableArray alloc] init];
for (int i = 0; i < rows; i++)
{
    NSMutableArray *secondDimension = [[NSMutableArray alloc] init];
    [firstDimension addObject:secondDimension];
}

So all you would do is add your other objects (in your case, the NSMutableDictionarys) to the secondDimension array. Usage would be like:

[[firstDimension objectAtIndex:0] objectAtIndex:0];

---

Edit

Full code example:

NSMutableArray *SRData = [[NSMutableArray alloc] init]; //first dimension
NSMutableArray *SRRow = [[NSMutableArray alloc] init]; //second dimension
[SRData addObject:SRRow]; //add row to data
[SRRow release];

NSMutableDictionary *SRField = [[NSMutableDictionary alloc] init]; //an element of the second dimension
[SRField setObject:@"Read" forKey:@"Descr"];
//Set the rest of your objects

[SRRow addObject:SRField]; //Add field to second dimension
[SRField release];

Now, to get at that “field” you would use code such as the following:

[[SRData objectAtIndex:0] objectAtIndex:0]; //Get the first element in the first array (the second dimension)