How to randomize an NSMutableArray? [duplicate]

Question

Possible Duplicate:
iphone - nsarray/nsmutablearray - re-arrange in random order

I have an NSMutableArray that contains 20 objects. Is there any way that I could randomize their order like when you shuffle a deck. (By order I mean their index in the array)

Like if I had an array that contained:

1. apple
2. orange
3. pear
4. banana

How could I randomize the order so that I could get something like:

1. orange
2. apple
3. banana
4. pear

Answer 1

Here's some sample code: Iterates through the array, and randomly switches an object's position with another.

for (int x = 0; x < [array count]; x++) {
    int randInt = (arc4random() % ([array count] - x)) + x;
    [array exchangeObjectAtIndex:x withObjectAtIndex:randInt];
}