ios - Swift 3 使用 NSAttributedString 渲染 textview 但想要更改默认字体

Question

如果这可以解决，首先要说声谢谢..所以我有 textview 获取带有 html 标签的数据..所以我使用 attributedText 和函数来呈现 html..它有效..但我需要更改font family..现在默认是“times new roman”我想改成“Helvetica”有什么线索吗？我为此使用扩展名:

extension Data {
var attributedString: NSAttributedString? {
    do {
        return try NSAttributedString(data: self, options:[NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType, NSCharacterEncodingDocumentAttribute: String.Encoding.utf8.rawValue], documentAttributes: nil)
    } catch {
        print(error)
    }
    return nil
}}

extension String {
var data: Data {
    return Data(utf8)
}}

然后我将它用于:

cell.txtview.attributedText = contentText.data.attributedString

它有效，但字体默认变成“times new roman”我需要改变它..有什么想法吗？我以前很感激..谢谢!

enter image description here

我也已经试过了...见下图

enter image description here

Answer 1

您的属性字符串必须如下所示:

使用 this link

let data = "vini".data(using: .utf8)

let attributedString = data!.attributedString
let newAttributedString = NSMutableAttributedString(attributedString: (attributedString)!)

newAttributedString.enumerateAttribute(NSFontAttributeName, in: NSMakeRange(0, (newAttributedString.length)), options: []) { value, range, stop in
    guard let currentFont = value as? UIFont else {
        return
    }

    let fontDescriptor = currentFont.fontDescriptor.addingAttributes([UIFontDescriptorFamilyAttribute: "Helvetica"])

    if let newFontDescriptor = fontDescriptor.matchingFontDescriptors(withMandatoryKeys: [UIFontDescriptorFamilyAttribute]).first {
        let newFont = UIFont(descriptor: newFontDescriptor, size: currentFont.pointSize)
            newAttributedString.addAttributes([NSFontAttributeName: newFont], range: range)
        }
    }

    print(newAttributedString)