创建10x10网格并在控制台中打印它的最佳方法是什么？

Question

I have something like this:

NSMutableArray *theBoard = [NSMutableArray array];

for (int i = 0; i < 100; i++) 
{
    [theBoard addObject:[NSString stringWithFormat:@"o"]];
} 

for (int i = 0; i < 10; i++) 
{
    NSLog(@"       %@",[[theBoard subarrayWithRange:NSMakeRange(0+(i*10), 10)]componentsJoinedByString:@"  "]);
}

Console output:

o o o o o o o o o o
o o o o o o o o o o
o o o o o o o o o o
o o o o o o o o o o
o o o o o o o o o o
o o o o o o o o o o
o o o o o o o o o o
o o o o o o o o o o
o o o o o o o o o o
o o o o o o o o o o

I need to work with the coordinates of the array . How can I solve this problem?

What is the best way to create a 10x10 grid and print it in the console?

Answer 1

Use a two dimensional array.

Here is how to do it:

NSArray *rowArray = @[@"o", @"o", @"o", @"o", @"o", @"o", @"o", @"o", @"o", @"o",];
NSMutableArray *board = [[NSMutableArray alloc] initWithCapacity:10];

for (int rowIndex = 0; rowIndex < 10; rowIndex ++)
{
    [board addObject:[rowArray mutableCopy]];
}

Let's print the board to the console:

for (int rowIndex = 0; rowIndex < 10; rowIndex ++)
{
    NSArray *row = board[rowIndex];

    NSLog(@"|%@|", [row componentsJoinedByString:@" "]);
}

Now you can reference each field on the board with X,Y coordinates :

board[yourXLocation][yourYLocation];

Side note. You can also declare your array in more visual way. To see what is going on.

Example of an 3x3 array:

NSArray *myArray = [[NSMutableArray alloc] initWithArray:@[@[ @"o", @"o", @"o"],
                                                           @[ @"o", @"o", @"o"],
                                                           @[ @"o", @"o", @"o"]]];

Answer 2

You should use a multi-dimensional array, or in this case a 2d array. This will allow you to find elements using something like theBoard[0][0]

NSMutableArray *theBoard = [NSMutableArray array];
for (int i = 0; i < 10; i++) {
    NSMutableArray *row = [NSMutableArray array];
    for (int j = 0; j < 10; j++) {
         [row addObject:[NSString stringWithFormat:@"o"]];
    }
    [theBoard addObject:row];
}