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我试图连接到具有不同属性的属性字符串，但没有反映任何变化，这是我的代码

//White color

NSMutableAttributedString *attributedString2 = [[NSMutableAttributedString alloc] initWithData:[[NSString stringWithFormat:@"%@",readingPartCntnt] dataUsingEncoding:NSUnicodeStringEncoding] options:@{ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType } documentAttributes:nil error:nil];
[attributedString2 addAttribute:NSForegroundColorAttributeName value:[UIColor whiteColor] range:NSMakeRange(0, attributedString2.length)];
[attributedString2 addAttribute:NSFontAttributeName value:font range:NSMakeRange(0, attributedString2.length)];

//Blue color

NSMutableAttributedString *attributedString3 = [[NSMutableAttributedString alloc] initWithData:[[NSString stringWithFormat:@"%@",readingFootCntnt] dataUsingEncoding:NSUnicodeStringEncoding] options:@{ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType } documentAttributes:nil error:nil];
[attributedString3 addAttribute:NSForegroundColorAttributeName value:[UIColor colorWithRed:(154.0/255.0) green:(224.0/255.0) blue:(250.0/255.0) alpha:1.0] range:NSMakeRange(0, attributedString3.length)];
[attributedString3 addAttribute:NSFontAttributeName value:font range:NSMakeRange(0, attributedString3.length)];
 //UITextview
 readingContent.attributedText = [NSMutableAttributedString attributedStringWithAttachment:attributedString2,attributedString3];

我想将两个属性字符串 2 属性字符串 3 连接到阅读内容中。我的代码需要什么更改？请帮我解决

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