在swift中使用属性字符串使文本变粗

时间：2015-02-13 09:17:23

标签： ios swift ios8 nsmutableattributedstring

我有一个像这样的字符串

var str = "@text1 this is good @text1"

现在用另一个字符串替换text1，比如t 1。我能够替换文本，但我无法加粗。我想加粗新字符串t 1，以便最终输出为：

@t 1 这很好 @t 1

我该怎么做？

我看到的所有示例都在Objective-C中，但我想在Swift中进行。

提前致谢。

19 个答案:

答案 0 :(得分：173)

这是一种在单个标签中组合粗体和普通文本的简洁方法。

<强>扩展：

Swift 3.0 

extension NSMutableAttributedString {
    @discardableResult func bold(_ text:String) -> NSMutableAttributedString {
        let attrs:[String:AnyObject] = [NSFontAttributeName: UIFont(name: "AvenirNext-Medium", size: 12)!]
        let boldString = NSMutableAttributedString(string: text, attributes:attrs)
        self.append(boldString)
        return self
    }

    @discardableResult func normal(_ text:String)->NSMutableAttributedString {
        let normal =  NSAttributedString(string: text)
        self.append(normal)
        return self
    }
}

Swift 4 

extension NSMutableAttributedString {
    @discardableResult func bold(_ text: String) -> NSMutableAttributedString {
        let attrs: [NSAttributedStringKey: Any] = [.font: UIFont(name: "AvenirNext-Medium", size: 12)!]
        let boldString = NSMutableAttributedString(string:text, attributes: attrs)
        append(boldString)

        return self
    }

    @discardableResult func normal(_ text: String) -> NSMutableAttributedString {
        let normal = NSAttributedString(string: text)
        append(normal)

        return self
    }
}

<强>用法： 

let formattedString = NSMutableAttributedString()
formattedString
    .bold("Bold Text")
    .normal(" Normal Text ")
    .bold("Bold Text")

let lbl = UILabel()
lbl.attributedText = formattedString

<强>结果：

  

粗体文字普通文字粗体文字

答案 1 :(得分：85)

var normalText = "Hi am normal"

var boldText  = "And I am BOLD!"

var attributedString = NSMutableAttributedString(string:normalText)

var attrs = [NSFontAttributeName : UIFont.boldSystemFont(ofSize: 15)]
var boldString = NSMutableAttributedString(string: boldText, attributes:attrs)

attributedString.append(boldString)

如果要将其指定给标签：

yourLabel.attributedText = attributedString

答案 2 :(得分：28)

编辑/更新： Xcode 8.3.2•Swift 3.1

如果您了解HTML和CSS，则可以使用它轻松控制属性字符串的字体样式，颜色和大小，如下所示：

extension String {
    var html2AttStr: NSAttributedString? {
        return try? NSAttributedString(data: Data(utf8), options: [NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType, NSCharacterEncodingDocumentAttribute: String.Encoding.utf8.rawValue], documentAttributes: nil)
    }
}

"<style type=\"text/css\">#red{color:#F00}#green{color:#0F0}#blue{color: #00F; font-weight: Bold; font-size: 32}</style><span id=\"red\" >Red,</span><span id=\"green\" > Green </span><span id=\"blue\">and Blue</span>".html2AttStr

答案 3 :(得分：11)

如果您正在使用本地化字符串，则可能无法依赖句子末尾的粗体字符串。如果是这种情况，那么以下情况很有效：

e.g。查询“blah”与任何项目

不匹配 
/* Create the search query part of the text, e.g. "blah". 
   The variable 'text' is just the value entered by  the user. */
let searchQuery = "\"\(text)\""

/* Put the search text into the message */
let message = "Query \(searchQuery). does not match any items"

/* Find the position of the search string. Cast to NSString as we want
   range to be of type NSRange, not Swift's Range<Index> */
let range = (message as NSString).rangeOfString(searchQuery)

/* Make the text at the given range bold. Rather than hard-coding a text size,
   Use the text size configured in Interface Builder. */
let attributedString = NSMutableAttributedString(string: message)
attributedString.addAttribute(NSFontAttributeName, value: UIFont.boldSystemFontOfSize(label.font.pointSize), range: range)

/* Put the text in a label */
label.attributedText = attributedString

答案 4 :(得分：7)

这是我提出的最佳方式。添加一个你可以从任何地方调用的函数，并将其添加到一个没有像Constants.swift这样的类的文件中，然后你可以通过调用 ONE LINE 代码在很多情况下在任何字符串中加入单词：< / p>

进入constants.swift文件：

import Foundation
import UIKit

func addBoldText(fullString: NSString, boldPartOfString: NSString, font: UIFont!, boldFont: UIFont!) -> NSAttributedString {
   let nonBoldFontAttribute = [NSFontAttributeName:font!]
   let boldFontAttribute = [NSFontAttributeName:boldFont!]
   let boldString = NSMutableAttributedString(string: fullString as String, attributes:nonBoldFontAttribute)
   boldString.addAttributes(boldFontAttribute, range: fullString.rangeOfString(boldPartOfString as String))
   return boldString
}

然后你可以为任何UILabel调用这一行代码：

self.UILabel.attributedText = addBoldText("Check again in 30 DAYS to find more friends", boldPartOfString: "30 DAYS", font: normalFont!, boldFont: boldSearchFont!)


//Mark: Albeit that you've had to define these somewhere:

let normalFont = UIFont(name: "INSERT FONT NAME", size: 15)
let boldFont = UIFont(name: "INSERT BOLD FONT", size: 15)

答案 5 :(得分：7)

我扩展了David West的好答案，以便您可以输入一个字符串并告诉它所有您想要鼓励的子字符串：

func addBoldText(fullString: NSString, boldPartsOfString: Array<NSString>, font: UIFont!, boldFont: UIFont!) -> NSAttributedString {
    let nonBoldFontAttribute = [NSFontAttributeName:font!]
    let boldFontAttribute = [NSFontAttributeName:boldFont!]
    let boldString = NSMutableAttributedString(string: fullString as String, attributes:nonBoldFontAttribute)
    for i in 0 ..< boldPartsOfString.count {
        boldString.addAttributes(boldFontAttribute, range: fullString.rangeOfString(boldPartsOfString[i] as String))
    }
    return boldString
}

然后像这样称呼它：

let normalFont = UIFont(name: "Dosis-Medium", size: 18)
let boldSearchFont = UIFont(name: "Dosis-Bold", size: 18)
self.UILabel.attributedText = addBoldText("Check again in 30 days to find more friends", boldPartsOfString: ["Check", "30 days", "find", "friends"], font: normalFont!, boldFont: boldSearchFont!)

这将鼓励你想要在给定字符串中加粗的所有子串

答案 6 :(得分：5)

以Jeremy Bader和David West的优秀答案为基础，推出Swift 3扩展程序：

extension String {
    func withBoldText(boldPartsOfString: Array<NSString>, font: UIFont!, boldFont: UIFont!) -> NSAttributedString {
        let nonBoldFontAttribute = [NSFontAttributeName:font!]
        let boldFontAttribute = [NSFontAttributeName:boldFont!]
        let boldString = NSMutableAttributedString(string: self as String, attributes:nonBoldFontAttribute)
        for i in 0 ..< boldPartsOfString.count {
            boldString.addAttributes(boldFontAttribute, range: (self as NSString).range(of: boldPartsOfString[i] as String))
        }
        return boldString
    }
}

用法：

let label = UILabel()
let font = UIFont(name: "AvenirNext-Italic", size: 24)!
let boldFont = UIFont(name: "AvenirNext-BoldItalic", size: 24)!
label.attributedText = "Make sure your face is\nbrightly and evenly lit".withBoldText(
    boldPartsOfString: ["brightly", "evenly"], font: font, boldFont: boldFont)

答案 7 :(得分：4)

使用.... 

let attrString = NSMutableAttributedString()
            .appendWith(weight: .semibold, "almost bold")
            .appendWith(color: .white, weight: .bold, " white and bold")
            .appendWith(color: .black, ofSize: 18.0, " big black")
两分钱...... 

extension NSMutableAttributedString {

    @discardableResult func appendWith(color: UIColor = UIColor.darkText, weight: UIFont.Weight = .regular, ofSize: CGFloat = 12.0, _ text: String) -> NSMutableAttributedString{
        let attrText = NSAttributedString.makeWith(color: color, weight: weight, ofSize:ofSize, text)
        self.append(attrText)
        return self
    }

}
extension NSAttributedString {

    public static func makeWith(color: UIColor = UIColor.darkText, weight: UIFont.Weight = .regular, ofSize: CGFloat = 12.0, _ text: String) -> NSMutableAttributedString {

        let attrs = [NSAttributedStringKey.font: UIFont.systemFont(ofSize: ofSize, weight: weight), NSAttributedStringKey.foregroundColor: color]
        return NSMutableAttributedString(string: text, attributes:attrs)
    }
}

答案 8 :(得分：2)

这可能很有用

class func createAttributedStringFrom (string1 : String ,strin2 : String, attributes1 : Dictionary<String, NSObject>, attributes2 : Dictionary<String, NSObject>) -> NSAttributedString{

let fullStringNormal = (string1 + strin2) as NSString
let attributedFullString = NSMutableAttributedString(string: fullStringNormal as String)

attributedFullString.addAttributes(attributes1, range: fullStringNormal.rangeOfString(string1))
attributedFullString.addAttributes(attributes2, range: fullStringNormal.rangeOfString(strin2))
return attributedFullString
}

答案 9 :(得分：2)

超级简单的方法。

    let text = "This string is having multiple font"
    let attributedText = 
    NSMutableAttributedString.getAttributedString(fromString: text)

    attributedText.apply(font: UIFont.boldSystemFont(ofSize: 24), subString: 
    "This")

    attributedText.apply(font: UIFont.boldSystemFont(ofSize: 24), onRange: 
    NSMakeRange(5, 6))

有关更多详细信息，请单击此处： https://github.com/iOSTechHub/AttributedString

答案 10 :(得分：2)

在此帖子中接受Prajeet Shrestha的响应有效，我想使用Label扩展他的解决方案（如果已知的话）和字体的特征。

Swift 4 

extension NSMutableAttributedString {

    @discardableResult func normal(_ text: String) -> NSMutableAttributedString {
        let normal = NSAttributedString(string: text)
        append(normal)

        return self
    }

    @discardableResult func bold(_ text: String, withLabel label: UILabel) -> NSMutableAttributedString {

        //generate the bold font
        var font: UIFont = UIFont(name: label.font.fontName , size: label.font.pointSize)!
        font = UIFont(descriptor: font.fontDescriptor.withSymbolicTraits(.traitBold) ?? font.fontDescriptor, size: font.pointSize)

        //generate attributes
        let attrs: [NSAttributedStringKey: Any] = [NSAttributedStringKey.font: font]
        let boldString = NSMutableAttributedString(string:text, attributes: attrs)

        //append the attributed text
        append(boldString)

        return self
    }
}

答案 11 :(得分：1)

对于->按大小搜索电视

使用NString及其范围的单向方式

let query = "Television"
let headerTitle = "size"
let message = "Search \(query) by \(headerTitle)"
let range = (message as NSString).range(of: query)
let attributedString = NSMutableAttributedString(string: message)
attributedString.addAttribute(NSAttributedString.Key.font, value: UIFont.boldSystemFont(ofSize: label1.font.pointSize), range: range)
label1.attributedText = attributedString

使用NString及其范围的另一无 

let query = "Television"
let headerTitle = "size"
let (searchText, byText) = ("Search ", " by \(headerTitle)")
let attributedString = NSMutableAttributedString(string: searchText)
let byTextAttributedString = NSMutableAttributedString(string: byText)
let attrs = [NSAttributedString.Key.font : UIFont.boldSystemFont(ofSize: label1.font.pointSize)]
let boldString = NSMutableAttributedString(string: query, attributes:attrs)
attributedString.append(boldString)
attributedString.append(byTextAttributedString)
label1.attributedText = attributedString

swift5

答案 12 :(得分：1)

Swift 3.0

根据您的要求将html转换为字符串和字体。

do {

     let str = try NSAttributedString(data: ("I'm a normal text and <b>this is my bold part . </b>And I'm again in the normal text".data(using: String.Encoding.unicode, allowLossyConversion: true)!), options: [ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType], documentAttributes: nil)

     myLabel.attributedText = str
     myLabel.font =  MONTSERRAT_BOLD(23)
     myLabel.textAlignment = NSTextAlignment.left
} catch {
     print(error)
}



func MONTSERRAT_BOLD(_ size: CGFloat) -> UIFont
{
    return UIFont(name: "MONTSERRAT-BOLD", size: size)!
}

答案 13 :(得分：0)

只需使用如下代码：

 let font = UIFont(name: "Your-Font-Name", size: 10.0)!

        let attributedText = NSMutableAttributedString(attributedString: noteLabel.attributedText!)
        let boldedRange = NSRange(attributedText.string.range(of: "Note:")!, in: attributedText.string)
        attributedText.addAttributes([NSAttributedString.Key.font : font], range: boldedRange)
        noteLabel.attributedText = attributedText

答案 14 :(得分：0)

Swift 4和更高版本

对于Swift 4和更高版本，这是一个好方法：

        let attributsBold = [NSAttributedString.Key.font : UIFont.systemFont(ofSize: 16, weight: .bold)]
    let attributsNormal = [NSAttributedString.Key.font : UIFont.systemFont(ofSize: 16, weight: .regular)]
    var attributedString = NSMutableAttributedString(string: "Hi ", attributes:attributsNormal)
    let boldStringPart = NSMutableAttributedString(string: "John", attributes:attributsBold)
    attributedString.append(boldStringPart)

    yourLabel.attributedText = attributedString

在标签中，文本看起来像：“嗨 John ”

答案 15 :(得分：0)

您可以使用下面编写的简单自定义方法来执行此操作。 您在第一个参数中给出了整个字符串，在第二个参数中给出了粗体文本。希望这会有所帮助。

func getAttributedBoldString(str : String, boldTxt : String) -> NSMutableAttributedString {
        let attrStr = NSMutableAttributedString.init(string: str)
        let boldedRange = NSRange(str.range(of: boldTxt)!, in: str)
        attrStr.addAttributes([NSAttributedString.Key.font : UIFont.systemFont(ofSize: 17, weight: .bold)], range: boldedRange)
        return attrStr
    }

用法： initalString =我是男孩

label.attributedText = getAttributedBoldString（str：initalString，boldTxt：“男孩”）

结果字符串=我是男孩

答案 16 :(得分：0)

两个内衬快速4：

            button.setAttributedTitle(.init(string: "My text", attributes: [.font: UIFont.systemFont(ofSize: 20, weight: .bold)]), for: .selected)
            button.setAttributedTitle(.init(string: "My text", attributes: [.font: UIFont.systemFont(ofSize: 20, weight: .regular)]), for: .normal)

答案 17 :(得分：0)

Swift 5.1 使用NSAttributedString.Key代替NSAttributedStringKey 

let test1Attributes:[NSAttributedString.Key: Any] = [.font : UIFont(name: "CircularStd-Book", size: 14)!]
let test2Attributes:[NSAttributedString.Key: Any] = [.font : UIFont(name: "CircularStd-Bold", size: 16)!]

let test1 = NSAttributedString(string: "\(greeting!) ", attributes:test1Attributes)
let test2 = NSAttributedString(string: firstName!, attributes:test2Attributes)
let text = NSMutableAttributedString()

text.append(test1)
text.append(test2)
return text

答案 18 :(得分：0)

改善Prajeet Shrestha回答： -

您可以为NSMutableAttributedString创建一个通用扩展，这涉及更少的代码。在这种情况下，我选择使用系统字体，但您可以调整它，以便您可以输入字体名称作为参数。

    extension NSMutableAttributedString {

        func systemFontWith(text: String, size: CGFloat, weight: CGFloat) -> NSMutableAttributedString {
            let attributes: [String: AnyObject] = [NSFontAttributeName: UIFont.systemFont(ofSize: size, weight: weight)]
            let string = NSMutableAttributedString(string: text, attributes: attributes)
            self.append(string)
            return self
        }
    }
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