使用Swift中的NSMutableAttributedString更改特定文本的颜色

Question

我遇到的问题是我希望能够在TextView中更改某些文本的textColor。我使用的是串联字符串，只是希望我附加到TextView文本中的字符串。似乎我想要使用的是NSMutableAttributedString，但我找不到任何有关如何在Swift中使用它的资源。到目前为止我所拥有的是这样的：

let string = "A \(stringOne) with \(stringTwo)"
var attributedString = NSMutableAttributedString(string: string)
textView.attributedText = attributedString

从这里我知道我需要找到需要更改textColor的单词范围，然后将它们添加到属性字符串中。我需要知道的是如何从attributionString中找到正确的字符串，然后更改它们的textColor。

由于我的评分太低，我无法回答我自己的问题，但这是我找到的答案

我通过翻译来翻译一些代码来找到我自己的答案

Change attributes of substrings in a NSAttributedString

以下是Swift中的实现示例：

let string = "A \(stringOne) and \(stringTwo)"
var attributedString = NSMutableAttributedString(string:string)

let stringOneRegex = NSRegularExpression(pattern: nameString, options: nil, error: nil)
let stringOneMatches = stringOneRegex.matchesInString(longString, options: nil, range: NSMakeRange(0, attributedString.length))
for stringOneMatch in stringOneMatches {
    let wordRange = stringOneMatch.rangeAtIndex(0)
    attributedString.addAttribute(NSForegroundColorAttributeName, value: UIColor.nameColor(), range: wordRange)
}

textView.attributedText = attributedString

由于我想要更改多个字符串的文本颜色，我将创建一个帮助函数来处理这个，但这适用于更改文本颜色。

Answer 1

我看到你在某种程度上回答了这个问题，但是在不使用正则表达式回答标题问题的情况下提供一种更简洁的方法：

要更改文本长度的颜色，您需要知道字符串中有颜色字符的开始和结束索引，例如

var main_string = "Hello World"
var string_to_color = "World"

var range = (main_string as NSString).rangeOfString(string_to_color)

然后转换为属性字符串并使用NSForegroundColorAttributeName的'add attribute'：

var attributedString = NSMutableAttributedString(string:main_string)
attributedString.addAttribute(NSForegroundColorAttributeName, value: UIColor.redColor() , range: range)

您可以在Apple's documentation中找到可以设置的其他标准属性的列表

Answer 2

基于我创建字符串扩展之前的答案

extension String {

func highlightWordsIn(highlightedWords: String, attributes: [[NSAttributedStringKey: Any]]) -> NSMutableAttributedString {
     let range = (self as NSString).range(of: highlightedWords)
     let result = NSMutableAttributedString(string: self)

     for attribute in attributes {
         result.addAttributes(attribute, range: range)
     }

     return result
    }
}

您可以将文本的属性传递给方法

像这样打电话

  let attributes = [[NSAttributedStringKey.foregroundColor:UIColor.red], [NSAttributedStringKey.font: UIFont.boldSystemFont(ofSize: 17)]]
  myLabel.attributedText = "This is a text".highlightWordsIn(highlightedWords: "is a text", attributes: attributes)

Answer 3

使用不同样式（如颜色，字体等）进行标注的最简单方法是在属性检查器中使用属性“属性”。只需选择部分文本并根据需要进行更改

Answer 4

Swift 4.1

我已经改变了这个在Swift 3中

let str = "Welcome "
let welcomeAttribute = [ NSForegroundColorAttributeName: UIColor.blue()]
let welcomeAttrString = NSMutableAttributedString(string: str, attributes: welcomeAttribute)

这在Swift 4.0中

let str = "Welcome "
let welcomeAttribute = [ NSAttributedStringKey.foregroundColor: UIColor.blue()]
let welcomeAttrString = NSMutableAttributedString(string: str, attributes: welcomeAttribute)

到Swift 4.1

let str = "Welcome "
let welcomeAttribute = [ NSAttributedStringKey(rawValue: NSForegroundColorAttributeName): UIColor.blue()]
let welcomeAttrString = NSMutableAttributedString(string: str, attributes: welcomeAttribute)

工作良好

Answer 5

迅捷4.2

    let textString = "Hello world"
    let range = (textString as NSString).range(of: "world")
    let attributedString = NSMutableAttributedString(string: textString)

    attributedString.addAttribute(NSAttributedStringKey.foregroundColor, value: UIColor.red, range: range)
    self.textUIlable.attributedText = attributedString

Answer 6

对于正在寻找“将特定颜色应用于文本中的多个单词”的每个人，我们可以使用NSRegularExpression来完成

 func highlight(matchingText: String, in text: String) {
    let attributedString  = NSMutableAttributedString(string: text)
    if let regularExpression = try? NSRegularExpression(pattern: "\(matchingText)", options: .caseInsensitive) {
        let matchedResults = regularExpression.matches(in: text, options: [], range: NSRange(location: 0, length: attributedString.length))
        for matched in matchedResults {
             attributedString.addAttributes([NSAttributedStringKey.backgroundColor : UIColor.yellow], range: matched.range)

        }
        yourLabel.attributedText = attributedString
    }
}

参考链接：https://gist.github.com/aquajach/4d9398b95a748fd37e88

Answer 7

这可能对你有用

let main_string = " User not found,Want to review ? Click here"
    let string_to_color = "Click here"

    let range = (main_string as NSString).range(of: string_to_color)

    let attribute = NSMutableAttributedString.init(string: main_string)
    attribute.addAttribute(NSAttributedStringKey.foregroundColor, value: UIColor.blue , range: range)

    lblClickHere.attributedText = attribute

Answer 8

如果您使用的是Swift 3x和UITextView，那么NSForegroundColorAttributeName可能无法正常工作（无论我采用何种方法，它都不适用于我）。

所以，经过一番挖掘，我找到了解决方案。

//Get the textView somehow
let textView = UITextView()
//Set the attributed string with links to it
textView.attributedString = attributedString
//Set the tint color. It will apply to the link only
textView.tintColor = UIColor.red

Answer 9

超级简单的方法来做到这一点。

let text = "This is a colorful attributed string"
let attributedText = 
NSMutableAttributedString.getAttributedString(fromString: text)
attributedText.apply(color: .red, subString: "This")
//Apply yellow color on range
attributedText.apply(color: .yellow, onRange: NSMakeRange(5, 4))

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

Answer 10

要更改字体颜色的颜色，请首先选择属性而不是如下图所示

然后，您需要在属性字段中选择文本，然后选择对齐右侧的颜色按钮。这会改变颜色。

Answer 11

您可以使用此方法。我在我的公共实用程序类中实现了此方法以全局访问。

func attributedString(with highlightString: String, normalString: String, highlightColor: UIColor) -> NSMutableAttributedString {
    let attributes = [NSAttributedString.Key.foregroundColor: highlightColor]
    let attributedString = NSMutableAttributedString(string: highlightString, attributes: attributes)
    attributedString.append(NSAttributedString(string: normalString))
    return attributedString
}

Answer 12

SWIFT 5

let main_string = "Hello World"
let string_to_color = "World"

let range = (main_string as NSString).range(of: string_to_color)

let attribute = NSMutableAttributedString.init(string: main_string)
attribute.addAttribute(NSAttributedString.Key.foregroundColor, value: UIColor.red , range: range)


txtfield1 = UITextField.init(frame:CGRect(x:10 , y:20 ,width:100 , height:100))
txtfield1.attributedText = attribute

SWIFT 4.2

 let txtfield1 :UITextField!

    let main_string = "Hello World"
    let string_to_color = "World"

    let range = (main_string as NSString).range(of: string_to_color)

    let attribute = NSMutableAttributedString.init(string: main_string)
    attribute.addAttribute(NSAttributedStringKey.foregroundColor, value: UIColor.red , range: range)


    txtfield1 = UITextField.init(frame:CGRect(x:10 , y:20 ,width:100 , height:100))
    txtfield1.attributedText = attribute

Answer 13

您需要更改textview参数，而不是属性字符串的参数

textView.linkTextAttributes = [
        NSAttributedString.Key.foregroundColor: UIColor.red,
        NSAttributedString.Key.underlineColor: UIColor.red,
        NSAttributedString.Key.underlineStyle: NSUnderlineStyle.single.rawValue
    ]

Answer 14

请检查cocoapod Prestyler：

Prestyler.defineRule("$", UIColor.orange)
label.attributedText = "This $text$ is orange".prestyled()

Answer 15

Swift 2.1更新：

 let text = "We tried to make this app as most intuitive as possible for you. If you have any questions don't hesitate to ask us. For a detailed manual just click here."
 let linkTextWithColor = "click here"

 let range = (text as NSString).rangeOfString(linkTextWithColor)

 let attributedString = NSMutableAttributedString(string:text)
 attributedString.addAttribute(NSForegroundColorAttributeName, value: UIColor.redColor() , range: range)

 self.helpText.attributedText = attributedString

self.helpText是一个UILabel出口。

Answer 16

在之前的帖子中已经给出了答案，但我有不同的方法

Swift 3x：

var myMutableString = NSMutableAttributedString()

myMutableString = NSMutableAttributedString(string: "Your full label textString")

myMutableString.setAttributes([NSFontAttributeName : UIFont(name: "HelveticaNeue-Light", size: CGFloat(17.0))!
        , NSForegroundColorAttributeName : UIColor(red: 232 / 255.0, green: 117 / 255.0, blue: 40 / 255.0, alpha: 1.0)], range: NSRange(location:12,length:8)) // What ever range you want to give

yourLabel.attributedText = myMutableString

希望这对任何人都有帮助！

Answer 17

克里斯的回答对我来说是一个很大的帮助，所以我用他的方法变成了一个我可以重用的功能。这让我为子串指定颜色，同时为字符串的其余部分添加另一种颜色。

static func createAttributedString(fullString: String, fullStringColor: UIColor, subString: String, subStringColor: UIColor) -> NSMutableAttributedString
{
    let range = (fullString as NSString).rangeOfString(subString)
    let attributedString = NSMutableAttributedString(string:fullString)
    attributedString.addAttribute(NSForegroundColorAttributeName, value: fullStringColor, range: NSRange(location: 0, length: fullString.characters.count))
    attributedString.addAttribute(NSForegroundColorAttributeName, value: subStringColor, range: range)
    return attributedString
}

Answer 18

Swift 4.1

NSAttributedStringKey.foregroundColor

例如，如果要更改NavBar中的字体：

self.navigationController?.navigationBar.titleTextAttributes = [ NSAttributedStringKey.font: UIFont.systemFont(ofSize: 22), NSAttributedStringKey.foregroundColor: UIColor.white]

Answer 19

您可以使用此扩展我测试它

swift 4.2

import Foundation
import UIKit

extension NSMutableAttributedString {

    convenience init (fullString: String, fullStringColor: UIColor, subString: String, subStringColor: UIColor) {
           let rangeOfSubString = (fullString as NSString).range(of: subString)
           let rangeOfFullString = NSRange(location: 0, length: fullString.count)//fullString.range(of: fullString)
           let attributedString = NSMutableAttributedString(string:fullString)
           attributedString.addAttribute(NSAttributedStringKey.foregroundColor, value: fullStringColor, range: rangeOfFullString)
           attributedString.addAttribute(NSAttributedStringKey.foregroundColor, value: subStringColor, range: rangeOfSubString)

           self.init(attributedString: attributedString)
   }

}

Answer 20

Swift 4.2和Swift 5对字符串进行着色。

扩展String时使用NSMutableAttributedString的一种非常简单的方法。这也可用于在整个字符串中着色多个单词。

为扩展名添加新文件，文件 - >新建 - >新文件，其名称为ex。 “NSAttributedString + TextColouring”并添加代码

import UIKit

extension String {
    func attributedStringWithColor(_ strings: [String], color: UIColor, characterSpacing: UInt? = nil) -> NSAttributedString {
        let attributedString = NSMutableAttributedString(string: self)
        for string in strings {
            let range = (self as NSString).range(of: string)
            attributedString.addAttribute(NSAttributedString.Key.foregroundColor, value: color, range: range)
        }

        guard let characterSpacing = characterSpacing else {return attributedString}

        attributedString.addAttribute(NSAttributedString.Key.kern, value: characterSpacing, range: NSRange(location: 0, length: attributedString.length))

        return attributedString
    }
}

现在，您可以在任何您想要的viewcontroller中全局使用：

let attributedWithTextColor: NSAttributedString = "Doc, welcome back :)".attributedStringWithColor(["Doc", "back"], color: UIColor.black)

myLabel.attributedText = attributedWithTextColor

Answer 21

Swift 2.2

var myMutableString = NSMutableAttributedString()

myMutableString = NSMutableAttributedString(string: "1234567890", attributes: [NSFontAttributeName:UIFont(name: kDefaultFontName, size: 14.0)!])

myMutableString.addAttribute(NSForegroundColorAttributeName, value: UIColor(red: 0.0/255.0, green: 125.0/255.0, blue: 179.0/255.0, alpha: 1.0), range: NSRange(location:0,length:5))

self.lblPhone.attributedText = myMutableString