find iOS launch image

NSString *imageName = nil;
CGSize screenSize = [[UIScreen mainScreen] bounds].size;
NSString *orientation = @"Portrait";//Landscape
NSDictionary *bundleInfoDict = [[NSBundle mainBundle] infoDictionary];
NSArray *imagesDict = [bundleInfoDict valueForKey:@"UILaunchImages"];
for (NSDictionary *dic in imagesDict) {
    CGSize imageSize = CGSizeFromString(dic[@"UILaunchImageSize"]);
      if (CGSizeEqualToSize(imageSize, screenSize) &&
          [orientation isEqualToString:dic[@"UILaunchImageOrientation"]]) {
          imageName = dic[@"UILaunchImageName"];
          break;
  }