1.//加载图片        NSTextAttachment *attch = [[NSTextAttachment alloc] init];        attch.image = [UIImage imageNamed:emotion.png];        CGFloat attchWH = self.font.lineHeight;        attch.bounds = CGRectMake(0, -4, attchWH, attchWH);        //根据附件创建一个属性文字        NSAttributedString *imageStr = [NSAttributedString attributedStringWithAttachment:attch];                2.//拼接文字        [attributedText appendAttributedString:self.attributedText];                3.//NSAttributedString转化为NSString        NSString *str = attributedText.string