NSArray shuffle items

NSArray+Extensions

- (NSArray *)shuffle
{
    NSUInteger count = [self count];
    NSMutableArray *mutableArray = [NSMutableArray arrayWithArray:self];
    for (NSUInteger i = 0; i < count; ++i) {
        NSInteger remainingCount = count - i;
        NSInteger exchangeIndex = i + arc4random_uniform((u_int32_t )remainingCount);
        [mutableArray exchangeObjectAtIndex:i withObjectAtIndex:exchangeIndex];
    }
    
    return mutableArray;
}