如何在iPhone中的运行时中创建NSMutableArrays

Question

In one of my applications I have to create the array's in run time whenever it's required. As below:

for(int i=0;i<10;i++)
{
   NSMutableArray *array1 = [[NSMutableArray alloc] init];
} 

means instead of creating a single array like array1 I want to create the arrays based on i value. Like whenever the condition is satisfied in for loop.

New arrays would be like array0,array1,array2,array3,array4....etc

If anyone know please let me know. thanks in advance.

Answer 1

How about creating an array of arrays? Like:

NSMutableArray *array = [NSMutableArray arrayWithCapacity:10];
for (int i = 0; i < 10; i++) {
     [array addObject:[NSMutableArray array]];
}

//get array 0
NSMutableArray *array0 = [array objectAtIndex:0];

//get array 1
NSMutableArray *array1 = [array objectAtIndex:1];

//get array i

NSMutableArray *arrayI = [array objectAtIndex:i];

Answer 2

It sounds like you want to access a bunch of different arrays based on a naming convention: array"i". You can't really create dynamic variables like that, but you can create strings and store those arrays in a NSMutableDictionary for easy retrieval.

NSUInteger count = 10;
NSMutableDictionary *arrays = [NSMutableDictionary dictionaryWithCapacity:count];
for (int i = 0; i < count; i++){
    [arrays setObject:[[NSMutableArray alloc] init] forKey:[NSString stringWithFormat: @"array%i", i];
}

Now when you want to access a particular array you can use:

NSMutableArray *array1 = [arrays objectForKey:@"array1"];