如何在UILabel文字的前后添加图片？

- (void)insertPictureInLabel
{
    
    NSTextAttachment *foreAttachment = [[NSTextAttachment alloc]init];
    foreAttachment.image = [UIImage imageNamed:@"bl_ios_splb_qyh"];
    foreAttachment.bounds = CGRectMake(0, 0, 15, 15);
    
    NSTextAttachment *backAttachment = [[NSTextAttachment alloc]init];
    backAttachment.image = [UIImage imageNamed:@"bl_ios_splb_hyh"];
    backAttachment.bounds = CGRectMake(0, 0, 15, 15);
    
    NSMutableAttributedString *orginalAttributString = [[NSMutableAttributedString alloc]initWithString:@""];
    NSAttributedString *firsString = [NSAttributedString attributedStringWithAttachment:foreAttachment];
    [orginalAttributString appendAttributedString:firsString];
    
    UILabel *pictureLabel = [[UILabel alloc]initWithFrame:CGRectMake(50, 64, screenSize.width - 100, 150)];
    pictureLabel.backgroundColor = [UIColor clearColor];
    NSMutableAttributedString *newAttributString = [[NSMutableAttributedString alloc]initWithString:@" 现在说的一些可能比较基础，大家会比较没兴趣，可是基础是练成高超技术的基石，趁着写博客的时候我自己也回顾一下这些基础知识，如果需要的demo的话我再发上来 "];
    pictureLabel.font = [UIFont systemFontOfSize:15];
    pictureLabel.numberOfLines = 0;
    NSAttributedString *secondString = [NSAttributedString attributedStringWithAttachment:backAttachment];
    [newAttributString appendAttributedString:secondString];
    
    [orginalAttributString appendAttributedString:newAttributString];
    pictureLabel.attributedText = orginalAttributString;
    
    [self.view addSubview:pictureLabel];
}