Non repeating random numbers in iOS? [duplicate]

Answer 1

int n = 10;
NSMutableArray *numbers = [NSMutableArray array];
for (int i = 0; i <= n; i++) {
    [numbers addObject:[NSNumber numberWithInt:i]];
}
NSMutableArray *result = [NSMutableArray array];
while ([numbers count] > 0) {
    int r = arc4random() % [numbers count];
    NSNumber *randomElement = [numbers objectAtIndex:r];
    [result addObject:randomElement];
    [numbers removeObjectAtIndex:r];
}
NSLog(@"%@", result);