segmentedControlのボタンに文字とImage両方を配置したい

タイトル通りなのですが
文字とImageを組み合わせてそれをまるっとUIImageで返すメソッドを
作って、それをsectionImagesに入れたところ
ボタン下部にグレーの横線が入ってしまいます。

ObjC
1#import "UIImage+UISegmentIconAndText.h"
2
3@implementation UIImage (UISegmentIconAndText)
4+ (id) imageFromImage:(UIImage*)image string:(NSString*)string color:(UIColor*)color
5{
6    UIFont *font = [UIFont systemFontOfSize:16.0];
7    CGSize expectedTextSize = [string sizeWithAttributes:@{NSFontAttributeName: font}];
8    int width = expectedTextSize.width + image.size.width + 5;
9    int height = MAX(expectedTextSize.height, image.size.width);
10    CGSize size = CGSizeMake((float)width, (float)height);
11    UIGraphicsBeginImageContextWithOptions(size, NO, 0);
12    CGContextRef context = UIGraphicsGetCurrentContext();
13    CGContextSetFillColorWithColor(context, color.CGColor);
14    int fontTopPosition = (height - expectedTextSize.height) / 2;
15    CGPoint textPoint = CGPointMake(image.size.width + 5, fontTopPosition);
16
17    [string drawAtPoint:textPoint withAttributes:@{NSFontAttributeName: font}];
18    // Images upside down so flip them
19    CGAffineTransform flipVertical = CGAffineTransformMake(1, 0, 0, -1, 0, size.height);
20    CGContextConcatCTM(context, flipVertical);
21    CGContextDrawImage(context, (CGRect){ {0, (height - image.size.height) / 2}, {image.size.width, image.size.height} }, [image CGImage]);
22    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
23    UIGraphicsEndImageContext();
24    return newImage;
25}
26@end
27