Better way to convert NSArray of NSString to NSArray of NSNumber

Question

Is there is a better way to convert NSArray of NSString into NSArray of NSNumber than the following code:

-(NSArray*) convertStringArrayToNumberArray:(NSArray *)strings {
    NSMutableArray *numbers = [[NSMutableArray alloc] initWithCapacity:strings.count];
    for (NSString *string in strings) {
        [numbers addObject:[NSNumber numberWithInteger:[string integerValue]]];
    }
    return numbers;
}

Answer 1

-(NSArray *)convertStringArrayToNumberArray:(NSArray *)strings {
    return [strings valueForKeyPath:@"self.integerValue"];
}

I test

NSArray * array = @[@"1",@"2",@"3"];
NSArray *num = [self convertStringArrayToNumberArray:array];

And result