UITextView linkTextAttributes 字体属性未应用于 NSAttributedString [英] UITextView linkTextAttributes font attribute not applied to NSAttributedString

问题描述

我有一个从 HTML 生成的 NSAttributedString，其中包含一些链接.属性字符串显示在 UITextView 中.我希望为链接应用不同的字体样式，并为此设置 linkTextAttributes.我添加了 NSForegroundColorAttributeName、NSFontAttributeName 和 NSUnderlineStyleAttributeName.出于某种原因，应用了前景色，但未应用其余属性.

myTextView.linkTextAttributes = [NSForegroundColorAttributeName : UIColor.redColor(), NSFontAttributeName : textLinkFont, NSUnderlineStyleAttributeName : NSUnderlineStyle.StyleNone.rawValue]

有没有其他人遇到过这种情况，我如何更改链接的字体样式而不必将内嵌 CSS 应用于原始 HTML?谢谢.

解决方案

不确定为什么 linkTextAttributes 对字体名称不起作用.但是我们可以通过更新 NSAttributedString 的链接属性来实现这一点.检查下面的代码.

 做 {let htmlStringCode = "欲了解更多信息 
I have an NSAttributedString generated from HTML which includes some links. The attributed string is shown in a UITextView. I wish to apply a different font style for the links and am setting linkTextAttributes for this. I've added NSForegroundColorAttributeName, NSFontAttributeName and NSUnderlineStyleAttributeName. For some reason the foreground color is applied but the remaining attributes are not.
myTextView.linkTextAttributes = [NSForegroundColorAttributeName : UIColor.redColor(), NSFontAttributeName : textLinkFont, NSUnderlineStyleAttributeName : NSUnderlineStyle.StyleNone.rawValue]
Has anyone else faced this and how do I change the font style for links without having to apply in-line CSS to the original HTML? Thanks.
解决方案
Not sure why linkTextAttributes doesn't work for the font name. But we can achieve this by updating the link attributes of the NSAttributedString. Check the code below.
        do {
        let htmlStringCode = "For more info <a href=\"http://www.samplelink.com/subpage.php?id=8\">Click here</a>"

        let string = try NSAttributedString(data: htmlStringCode.dataUsingEncoding(NSUTF8StringEncoding)!, options: [NSDocumentTypeDocumentAttribute:NSHTMLTextDocumentType, NSCharacterEncodingDocumentAttribute: NSUTF8StringEncoding], documentAttributes: nil)

        let newString = NSMutableAttributedString(attributedString: string)
        string.enumerateAttributesInRange(NSRange.init(location: 0, length: string.length), options: .Reverse) { (attributes : [String : AnyObject], range:NSRange, _) -> Void in
            if let _ = attributes[NSLinkAttributeName] {
                newString.removeAttribute(NSFontAttributeName, range: range)
                newString.addAttribute(NSFontAttributeName, value: UIFont.systemFontOfSize(30), range: range)
            }
        }
        textField.attributedText = newString
        textField.linkTextAttributes = [NSForegroundColorAttributeName : UIColor.redColor(), NSUnderlineStyleAttributeName : NSUnderlineStyle.StyleNone.rawValue]

    }catch {
    }
This is the objective-C code for this:
NSDictionary *options = @{NSDocumentTypeDocumentAttribute : NSHTMLTextDocumentType};
NSData *data = [html dataUsingEncoding:NSUnicodeStringEncoding allowLossyConversion:NO];

NSAttributedString *attributedString = [[NSAttributedString alloc] initWithData:data options:options documentAttributes:nil error:nil];
NSMutableAttributedString *attributedStringWithBoldLinks = [[NSMutableAttributedString alloc] initWithAttributedString:attributedString];

[attributedString enumerateAttributesInRange:NSMakeRange(0, attributedString.string.length) options:NSAttributedStringEnumerationReverse usingBlock:^(NSDictionary<NSString *,id> * _Nonnull attrs, NSRange range, BOOL * _Nonnull stop) {

    if ([attrs objectForKey:NSLinkAttributeName]) {
        [attributedStringWithBoldLinks removeAttribute:NSFontAttributeName range:range];
        [attributedStringWithBoldLinks addAttribute:NSFontAttributeName value:[UIFont fontWithName:@"YourFont-Bold" size:16.0] range:range];
    }
}];

self.linkTextAttributes = @{NSForegroundColorAttributeName : [UIColor redColor]};

self.attributedText = attributedStringWithBoldLinks;


                        
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