iOS Question How to use iAdMob ADAdSizeMediumRectangle with admob 3

#if OBJC
- (NSArray *)GetAdaptiveSize:(float)width {
    GADAdSize g = GADCurrentOrientationAnchoredAdaptiveBannerAdSizeWithWidth(width);
    CGSize s = g.size;
    return @[[NSValue valueWithBytes: &g
                objCType:@encode(GADAdSize)], @(s.width), @(s.height)];
}
- (NSObject*)customSize:(int)width :(int)height {
   GADAdSize size = GADAdSizeFromCGSize(CGSizeMake(width, height));
  return [NSValue valueWithBytes:&size  objCType:@encode(GADAdSize)];
}
- (NSObject*)SIZE_MEDIUM_RECTANGLE {
  return [NSValue valueWithBytes:&GADAdSizeMediumRectangle objCType:@encode(GADAdSize)];
}
#End If