Shuffle Array

- (NSArray*)shuffleArray:(NSArray*)array {

    NSMutableArray *temp = [[NSMutableArray alloc] initWithArray:array];

    for(NSUInteger i = [array count]; i > 1; i--) {
        NSUInteger j = arc4random_uniform(i);
        [temp exchangeObjectAtIndex:i-1 withObjectAtIndex:j];
    }

    return [NSArray arrayWithArray:temp];
}

Reference