ios 如何在 NSAttributedString 上设置字体大小

How to set font size on NSAttributedString

提问by Martin Muldoon

Edit - This has been marked as duplicate, but as I state below, I am looking for a Swift solution. Everything I've found is written in Objective C.

编辑 - 这已被标记为重复，但正如我在下面所述，我正在寻找一个 Swift 解决方案。我发现的所有内容都是用 Objective C 编写的。

I am trying to convert HTML into an NSAttributedString, but can't figure how to set the font style and size. All of the examples are in Objective C which I'm not skilled in. How can I set the font style/size to System 15 (as an example)

我正在尝试将 HTML 转换为 NSAttributedString，但无法确定如何设置字体样式和大小。所有示例都在我不熟悉的目标 C 中。如何将字体样式/大小设置为 System 15（作为示例）

private func stringFromHtml(string: String) -> NSAttributedString? {
        do {
            let data = string.data(using: String.Encoding.utf8, allowLossyConversion: true)
            if let d = data {
                let str = try NSAttributedString(data: d,
                                                 options: [NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType],                                                  documentAttributes: nil)
                return str
            }
        } catch {
        }
        return nil
    }

EDIT...... I've tried several ways. I can't get it to work. I'm now getting an error message: Type of expression is ambiguous without more context. It's pointing to the NSAttributedString I've tried the following:

编辑......我尝试了几种方法。我无法让它工作。我现在收到一条错误消息：表达式类型不明确，没有更多上下文。它指向 NSAttributedString 我尝试了以下操作：

let myAttribute = [ NSForegroundColorAttributeName: UIColor.blue ]
let data = string.data(using: String.Encoding.utf8, allowLossyConversion: true)
  if let d = data {
     let str = try NSAttributedString(data: d,
                       attributes: myAttribute,
                       options: [NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType], documentAttributes: nil)

回答by Vikas Rajput

  let myString = "Swift Attributed String"
  let myAttribute = [ NSForegroundColorAttributeName: UIColor.blue ]
  let myAttrString = NSAttributedString(string: myString, attributes: myAttribute) 

  // set attributed text on a UILabel
  myLabel.attributedText = myAttrString

font

字体

 let myAttribute = [ NSFontAttributeName: UIFont(name: "Chalkduster", size: 18.0)! ]

Shadow

阴影

let myShadow = NSShadow()
myShadow.shadowBlurRadius = 3
myShadow.shadowOffset = CGSize(width: 3, height: 3)
myShadow.shadowColor = UIColor.gray
let myAttribute = [ NSShadowAttributeName: myShadow ]

Underline

强调

 let myAttribute = [ NSUnderlineStyleAttributeName: NSUnderlineStyle.StyleSingle.rawValue ]

Textcolor

文字颜色

 let myAttribute = [ NSForegroundColorAttributeName: UIColor.blue ]

BackGroud Color

背景颜色

  let myAttribute = [ NSBackgroundColorAttributeName: UIColor.yellow ]

回答by Osman

Swift 4 You can use :

斯威夫特 4 您可以使用：

 let stringWithAttribute = NSAttributedString(string: selectedFilter ?? "",
                                                  attributes: [NSAttributedStringKey.font: UIFont.systemFont(ofSize: 14.0)])

回答by Alan Steiman

The only thing that worked for me is to wrap the HTML in a <span>and apply the style there:

唯一对我有用的是将 HTML 包装在 a 中<span>并在那里应用样式：

let modifiedFontString = "<span style=\"font-family: Lato-Regular; font-size: 14; color: rgb(60, 60, 60)\">" + originalHTMLString + "</span>"

Try this extension:

试试这个扩展：

extension String {

    var htmlToAttributedString: NSAttributedString? {
        guard let data = data(using: .utf8) else { return NSAttributedString() }
        do {
            return try NSAttributedString(data: data, options: [.documentType: NSAttributedString.DocumentType.html, .characterEncoding:String.Encoding.utf8.rawValue], documentAttributes: nil)
        } catch {
            return NSAttributedString()
        }
    }

    var htmlToString: String {
        return htmlToAttributedString?.string ?? ""
    }

    func convertToAttributedString() -> NSAttributedString? {
        let modifiedFontString = "<span style=\"font-family: Lato-Regular; font-size: 14; color: rgb(60, 60, 60)\">" + self + "</span>"
        return modifiedFontString.htmlToAttributedString
    }
}

And you use it like this:

你像这样使用它：

someLabel.attributedString = someHTMLString.convertToAttributedString()

Hope it helps!

希望能帮助到你！

回答by iOS

请检查这个

var attrString = NSAttributedString(string: "labelText", attributes: [NSForegroundColorAttributeName: UIColor.red, NSFontAttributeName: UIFont(name: "system", size: 12)])
label.attributedText = attrString

回答by Sakshi

First you need to convert data to string then use this peice of code

首先，您需要将数据转换为字符串，然后使用这段代码

let  attributes = [
   NSForegroundColorAttributeName: UIColor.black,
            ]
try NSAttributedString(string: "", attributes: attributes)

回答by iNiravKotecha

you can set this way

你可以这样设置

let attribute: [String : Any] = [NSFontAttributeName: UIFont.systemFont(ofSize: UIFont.systemFontSize, weight: UIFontWeightThin),
    NSForegroundColorAttributeName: UIColor.red]

let attributedText = NSAttributedString(string: "Your String", attributes: attribute)