我有一个这样的字符串
var str = "@text1 this is good @text1"
现在将text1 替换为另一个字符串，例如t 1。我可以替换文本，但我无法将其加粗。我想将新字符串t 1加粗，这样最终的输出就是：
@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 中完成。
提前致谢。
【问题讨论】：
标签： ios swift nsmutableattributedstring
编辑/更新：Xcode 13.1 • Swift 5.5.1
如果您了解 HTML 和 CSS，您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：
讨论
不应从后台线程调用 HTML 导入器（即，选项字典包含值为 html 的 documentType）。它将尝试与主线程同步，失败并超时。从主线程调用它是可行的（但如果 HTML 包含对外部资源的引用，仍然会超时，应该不惜一切代价避免这种情况）。 HTML 导入机制旨在实现诸如 markdown 之类的东西（即文本样式、颜色等），而不是用于一般的 HTML 导入。
extension StringProtocol {
var html2AttStr: NSAttributedString? {
try? NSAttributedString(data: Data(utf8), options: [.documentType: NSAttributedString.DocumentType.html, .characterEncoding: 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
【讨论】：
<link href=\"https://fonts.googleapis.com/css?family=Frank+Ruhl+Libre\" rel=\"stylesheet\"> <span style=\"font-family: 'Frank Ruhl Libre', sans-serif;\">שלום</span>
var normalText = "Hi am normal"
var boldText = "And I am BOLD!"
var attributedString = NSMutableAttributedString(string:normalText)
var attrs = [NSAttributedString.Key.font : UIFont.boldSystemFont(ofSize: 15)]
var boldString = NSMutableAttributedString(string: boldText, attributes:attrs)
attributedString.append(boldString)
当您想将其分配给标签时：
yourLabel.attributedText = attributedString
【讨论】：
用法：
let label = UILabel()
label.attributedText =
NSMutableAttributedString()
.bold("Address: ")
.normal(" Kathmandu, Nepal\n\n")
.orangeHighlight(" Email: ")
.blackHighlight(" prajeet.shrestha@gmail.com ")
.bold("\n\nCopyright: ")
.underlined(" All rights reserved. 2020.")
结果：
这是一种在单个标签中组合粗体和普通文本以及其他一些奖励方法的巧妙方法。
扩展：Swift 5.*
extension NSMutableAttributedString {
var fontSize:CGFloat { return 14 }
var boldFont:UIFont { return UIFont(name: "AvenirNext-Bold", size: fontSize) ?? UIFont.boldSystemFont(ofSize: fontSize) }
var normalFont:UIFont { return UIFont(name: "AvenirNext-Regular", size: fontSize) ?? UIFont.systemFont(ofSize: fontSize)}
func bold(_ value:String) -> NSMutableAttributedString {
let attributes:[NSAttributedString.Key : Any] = [
.font : boldFont
]
self.append(NSAttributedString(string: value, attributes:attributes))
return self
}
func normal(_ value:String) -> NSMutableAttributedString {
let attributes:[NSAttributedString.Key : Any] = [
.font : normalFont,
]
self.append(NSAttributedString(string: value, attributes:attributes))
return self
}
/* Other styling methods */
func orangeHighlight(_ value:String) -> NSMutableAttributedString {
let attributes:[NSAttributedString.Key : Any] = [
.font : normalFont,
.foregroundColor : UIColor.white,
.backgroundColor : UIColor.orange
]
self.append(NSAttributedString(string: value, attributes:attributes))
return self
}
func blackHighlight(_ value:String) -> NSMutableAttributedString {
let attributes:[NSAttributedString.Key : Any] = [
.font : normalFont,
.foregroundColor : UIColor.white,
.backgroundColor : UIColor.black
]
self.append(NSAttributedString(string: value, attributes:attributes))
return self
}
func underlined(_ value:String) -> NSMutableAttributedString {
let attributes:[NSAttributedString.Key : Any] = [
.font : normalFont,
.underlineStyle : NSUnderlineStyle.single.rawValue
]
self.append(NSAttributedString(string: value, attributes:attributes))
return self
}
}
注意：如果编译器缺少 UIFont/UIColor，请将其替换为 NSFont/NSColor。
【讨论】：
func bold(_ text:String, _ size:CGFloat)。我在粗体上加了大小，这样我就可以从外面控制它。另外，我错过了这个函数中的AvenirNext-Medium 字体，所以我花了几分钟才明白为什么我看不到我的字体。请注意。
对于 Swift 4 及更高版本，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：“Hi John”
【讨论】：
For -> 按尺寸搜索电视
1-way 使用 NString 及其范围
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
另一个没有使用 NString 及其范围
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
【讨论】：
斯威夫特 5.1
使用NSAttributedString.Key 而不是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
【讨论】：
swift 4 中的两个班轮：
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)
【讨论】：
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字。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 : "Boy")
结果字符串 = 我是一个男孩
【讨论】：
用法....
let attrString = NSMutableAttributedString()
.appendWith(weight: .semibold, "almost bold")
.appendWith(color: .white, weight: .bold, " white and bold")
.appendWith(color: .black, ofSize: 18.0, " big black")
两美分...
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)
}
}
【讨论】：
只需使用类似这样的代码：
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
【讨论】：
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))
【讨论】：
apply 方法与您想要的字体一起使用
在此线程中接受Prajeet Shrestha 的响应为有效，如果已知标签和字体特征，我想使用标签扩展他的解决方案。
斯威夫特 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
}
}
【讨论】：
斯威夫特 3.0
根据您的要求将 html 转换为字符串和字体更改。
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)!
}
【讨论】：
Data("I'm a normal text and <b>this is my bold part . </b>And I'm again in the normal text".utf8) 初始化 Data 并在选项 [NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType, NSCharacterEncodingDocumentAttribute: String.Encoding.utf8.rawValue] 中设置字符编码
改进 Prajeet Shrestha 答案：-
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，但您可以对其进行调整，以便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
}
}
【讨论】：
基于 Jeremy Bader 和 David West 的出色答案，Swift 3 扩展：
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)
【讨论】：
我扩展了 David West 的精彩答案，以便您可以输入一个字符串并告诉它所有您想要加粗的子字符串：
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!)
这将使您想要在给定字符串中加粗的所有子字符串加粗
【讨论】：
如果您使用的是本地化字符串，您可能无法依赖始终位于句子末尾的粗体字符串。如果是这种情况，那么以下方法效果很好：
例如查询“blah”不匹配任何项目
/* 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
【讨论】：
这是我想出的最好的方法。添加一个您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，然后您可以在许多情况下通过调用 ONE LINE 代码来使任何字符串中的单词加粗：
进入一个 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)
【讨论】：
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
}
【讨论】：