AttributedString——不仅仅让文字更漂亮

var attributedString = AttributedString("请访问肘子的博客")let zhouzi = attributedString.range(of: "肘子")!  // 获取肘子二字的范围（Range）attributedString[zhouzi].inlinePresentationIntent = .stronglyEmphasized // 设置属性——粗体let blog = attributedString.range(of: "博客")! attributedString[blog].link = URL(string: "https://www.fatbobman.com")! // 设置属性——超链接

    @ViewBuilder    var helloView:some View{        HStack(alignment:.lastTextBaseline, spacing:0){            Text("Hello").font(.title).foregroundColor(.red)            Text(" world").font(.callout).foregroundColor(.cyan)        }    }

    var helloText:Text {        Text("Hello").font(.title).foregroundColor(.red) + Text(" world").font(.callout).foregroundColor(.cyan)    }

    var helloAttributedString:AttributedString {        var hello = AttributedString("Hello")        hello.font = .title.bold()        hello.foregroundColor = .red        var world = AttributedString(" world")        world.font = .callout        world.foregroundColor = .cyan        return hello + world    }        Text(helloAttributedString)

let hello = NSMutableAttributedString("hello")let world = NSAttributedString(" world")hello.append(world)

var hello = AttributedString("hello")let world = AttributedString(" world")hello.append(world)

// 可能出现类型不匹配let attributes: [NSAttributedString.Key: Any] = [    .font: UIFont.systemFont(ofSize: 72),    .foregroundColor: UIColor.white,]

var localizableString = AttributedString(localized: "Hello \(Date.now,format: .dateTime) world",locale: Locale(identifier: "zh-cn"),option:.applyReplacementIndexAttribute)

var dateString: AttributedString {        var attributedString = Date.now.formatted(.dateTime            .hour()            .minute()            .weekday()            .attributed        )        let weekContainer = AttributeContainer()            .dateField(.weekday)        let colorContainer = AttributeContainer()            .foregroundColor(.red)        attributedString.replaceAttributes(weekContainer, with: colorContainer)        return attributedString}Text(dateString)

// AttributedString -> NSAttributedStringlet nsString = NSMutableAttributedString("hello")var attributedString = AttributedString(nsString)// NSAttribuedString -> AttributedStringvar attString = AttributedString("hello")attString.uiKit.foregroundColor = .redlet nsString1 = NSAttributedString(attString)

var string = AttributedString("hello world")// 使用点语法string.font = .calloutlet font = string.font // 使用KeyPathlet font = string[keyPath:\.font] 

enum OutlineColorAttribute : AttributedStringKey {    typealias Value = Color // 属性类型    static let name = "OutlineColor" // 属性名称}string.outlineColor = .blue

var attributedString = AttributedString("Swift")string.foregroundColor = .red var container = AttributeContainer()container.inlinePresentationIntent = .strikethroughcontainer.font = .captioncontainer.backgroundColor = .pinkcontainer.foregroundColor = .green //将覆盖原来的redattributedString.setAttributes(container) // attributdString此时拥有四个属性内容

var container = AttributeContainer()container.inlinePresentationIntent = .strikethroughcontainer.font = .captioncontainer.backgroundColor = .pinkcontainer.foregroundColor = .greenattributedString.setAttributes(container)// 此时attributedString有四个属性内容 font、backgroundColor、foregroundColor、inlinePresentationIntent// 被替换的属性var container1 = AttributeContainer()container1.foregroundColor = .greencontainer1.font = .caption// 将要替换的属性var container2 = AttributeContainer()container2.link = URL(string: "https://www.swift.org")// 被替换属性contianer1的属性键值内容全部符合才可替换，比如continaer1的foregroundColor为.red将不进行替换attributedString.replaceAttributes(container1, with: container2)// 替换后attributedString有三个属性内容 backgroundColor、inlinePresentationIntent、link

var container = AttributeContainer()container.inlinePresentationIntent = .strikethroughcontainer.font = .captioncontainer.backgroundColor = .pinkcontainer.foregroundColor = .greenattributedString.setAttributes(container)// 此时attributedString有四个属性内容 font、backgroundColor、foregroundColor、inlinePresentationIntentvar container2 = AttributeContainer()container2.foregroundColor = .redcontainer2.link = URL(string: "www.swift.org")attributedString.mergeAttributes(container2,mergePolicy: .keepNew)// 合并后attributedString有五个属性 ，font、backgroundColor、foregroundColor、inlinePresentationIntent及link // foreground为.red// 属性冲突时，通过mergePolicy选择合并策略 .keepNew(默认) 或 .keepCurrent

uiKitString.uiKit.foregroundColor = .red //UIColorappKitString.appKit.backgroundColor = .yellow //NSColor

attributedString.swiftUI.foregroundColor = .redattributedString.uiKit.foregroundColor = .redattributedString.appKit.foregroundColor = .red// 转换成NSAttributedString，可以只转换指定的Scope属性let nsString = try! NSAttributedString(attributedString, including: \.uiKit)

attributedString.inlinePresentationIntent = .stronglyEmphasized //相当于 bold

let nsString = try! NSAttributedString(attributedString, including: \.appKit)// attributedString中属于foundation和accessibility的属性也将一并被转换

var attributedString = AttributedString("Swift")attributedString.characters.count // 5

let attributedString = AttributedString("hello 👩🏽‍🦳")attributedString.characters.count // 7attributedString.unicodeScalars.count // 10

String(attributedString.characters) // "Swift"

var attributedString = AttributedString("hello world")let range = attributedString.range(of: "hello")!attributedString.characters.replaceSubrange(range, with: "good")// good world ,替换后的good仍会保留hello所在位置的所有属性

let attributedString = AttribuedString("Core Data")print(attributedString)// Core Data {}print(attributedString.runs.count) // 1

var coreData = AttributedString("Core")coreData.font = .titlecoreData.foregroundColor = .greencoreData.append(AttributedString(" Data"))for run in coreData.runs { //runs.count = 2    print(run)}// Core { //             SwiftUI.Font = Font(provider: SwiftUI.(unknown context at $7fff5cd3a0a0).FontBox<SwiftUI.Font.(unknown context at $7fff5cd66db0).TextStyleProvider>)//            SwiftUI.ForegroundColor = green//            }// Data {}

var multiRunString = AttributedString("The attributed runs of the attributed string, as a view into the underlying string.")while let range = multiRunString.range(of: "attributed") {    multiRunString.characters.replaceSubrange(range, with: "attributed".uppercased())    multiRunString[range].inlinePresentationIntent = .stronglyEmphasized}var n = 0for run in multiRunString.runs {    n += 1}// n = 5

// 继续使用上文的multiRunString// 将所有非强调字符设置为黄色for run in multiRunString.runs {    guard run.inlinePresentationIntent != .stronglyEmphasized else {continue}    multiRunString[run.range].foregroundColor = .yellow}

// 将颜色为黄色且为粗体的文字改成红色for (color,intent,range) in multiRunString.runs[\.foregroundColor,\.inlinePresentationIntent] {    if color == .yellow && intent == .stronglyEmphasized {        multiRunString[range].foregroundColor = .red    }}

var totalKeysContainer = AttributeContainer()for run in multiRunString.runs{    let container = run.attributes    totalKeysContainer.merge(container)}

multiRunString.transformingAttributes(\.foregroundColor,\.font){ color,font in    if color.value == .yellow && font.value == .title {        multiRunString[color.range].backgroundColor = .green    }}

// 从属性字符串的结尾向前查找，返回第一个满足关键字的range(忽略大小写)if let range = multiRunString.range(of: "Attributed", options: [.backwards, .caseInsensitive]) {    multiRunString[range].link = URL(string: "https://www.apple.com")}

if let lowBound = multiRunString.characters.firstIndex(of: "r"),   let upperBound = multiRunString.characters.firstIndex(of: ","),   lowBound < upperBound{    multiRunString[lowBound...upperBound].foregroundColor = .brown}

// Localizable Chinese"hello" = "你好";// Localizable English"hello" = "hello";let attributedString = AttributedString(localized: "hello")

var hello = AttributedString(localized: "hello")if let range = hello.range(of: "h") {    hello[range].foregroundColor = .red}

// Localizable Chinese"world %@ %@" = "%@ 世界 %@";// Localizable English"world %@ %@" = "world %@ %@";var world = AttributedString(localized: "world \("👍") \("🥩")",options: .applyReplacementIndexAttribute) // 创建属性字符串时，将按照插值顺序设定index ，👍 index == 1 🥩 index == 2for (index,range) in world.runs[\.replacementIndex] {    switch index {        case 1:            world[range].baselineOffset = 20            world[range].font = .title        case 2:            world[range].backgroundColor = .blue        default:            world[range].inlinePresentationIntent = .strikethrough    }}

 AttributedString(localized: "\(Date.now, format: Date.FormatStyle(date: .long))", locale: Locale(identifier: "zh-cn"))// 即使在英文环境中也会显示 2021年10月7日

        var dateString = Date.now.formatted(.dateTime.year().month().day().attributed)        dateString.transformingAttributes(\.dateField) { dateField in            switch dateField.value {            case .month:                dateString[dateField.range].foregroundColor = .red            case .day:                dateString[dateField.range].foregroundColor = .green            case .year:                dateString[dateField.range].foregroundColor = .blue            default:                break            }        }

var markdownString = AttributedString(localized: "**Hello** ~world~ _!_")for (inlineIntent,range) in markdownString.runs[\.inlinePresentationIntent] {    guard let inlineIntent = inlineIntent else {continue}    switch inlineIntent{        case .stronglyEmphasized:            markdownString[range].foregroundColor = .red        case .emphasized:            markdownString[range].foregroundColor = .green        case .strikethrough:            markdownString[range].foregroundColor = .blue        default:            break    }}

let mdString = try! AttributedString(markdown: "# Title\n**hello**\n")print(mdString)// 解析结果Title {    NSPresentationIntent = [header 1 (id 1)]}hello {    NSInlinePresentationIntent = NSInlinePresentationIntent(rawValue: 2)    NSPresentationIntent = [paragraph (id 2)]}

#  Hello ## Header2hello **world*** first* second> test `print("hello world")`| row1 | row2 || ---- | ---- || 34   | 135  |[新Formatter介绍](/posts/newFormatter/)

let url = Bundle.main.url(forResource: "README", withExtension: "md")!var markdownString = try! AttributedString(contentsOf: url,baseURL: URL(string: "https://www.fatbobman.com"))

Hello {    NSPresentationIntent = [header 1 (id 1)]}Header2 {    NSPresentationIntent = [header 2 (id 2)]}first {    NSPresentationIntent = [paragraph (id 6), listItem 1 (id 5), unorderedList (id 4)]}test  {    NSPresentationIntent = [paragraph (id 10), blockQuote (id 9)]}print("hello world") {    NSPresentationIntent = [paragraph (id 10), blockQuote (id 9)]    NSInlinePresentationIntent = NSInlinePresentationIntent(rawValue: 4)}row1 {    NSPresentationIntent = [tableCell 0 (id 13), tableHeaderRow (id 12), table [Foundation.PresentationIntent.TableColumn(alignment: Foundation.PresentationIntent.TableColumn.Alignment.left), Foundation.PresentationIntent.TableColumn(alignment: Foundation.PresentationIntent.TableColumn.Alignment.left)] (id 11)]}row2 {    NSPresentationIntent = [tableCell 1 (id 14), tableHeaderRow (id 12), table [Foundation.PresentationIntent.TableColumn(alignment: Foundation.PresentationIntent.TableColumn.Alignment.left), Foundation.PresentationIntent.TableColumn(alignment: Foundation.PresentationIntent.TableColumn.Alignment.left)] (id 11)]}新Formatter介绍 {    NSPresentationIntent = [paragraph (id 18)]    NSLink = /posts/newFormatter/ -- https://www.fatbobman.com}

for run in markdownString.runs {    if let inlinePresentationIntent = run.inlinePresentationIntent {        switch inlinePresentationIntent {        case .strikethrough:            print("删除线")        case .stronglyEmphasized:            print("粗体")        default:            break        }    }    if let presentationIntent = run.presentationIntent {        for component in presentationIntent.components {            switch component.kind{                case .codeBlock(let languageHint):                    print(languageHint)                case .header(let level):                    print(level)                case .paragraph:                    let paragraphID = component.identity                default:                    break            }        }    }}

struct MyIDKey:AttributedStringKey {    typealias Value = Int // 属性内容的类型。类型需要符合Hashable    static var name: String = "id" // 属性字符串内部保存的名称}extension AttributeScopes{    public struct MyScope:AttributeScope{        let id:MyIDKey  // 点语法调用的名称        let swiftUI:SwiftUIAttributes // 在我的Scope中将系统框架swiftUI也添加进来    }    var myScope:MyScope.Type{        MyScope.self    }}extension AttributeDynamicLookup{    subscript<T>(dynamicMember keyPath:KeyPath<AttributeScopes.MyScope,T>) -> T where T:AttributedStringKey {        self[T.self]    }}

var attribtedString = AttributedString("hello world")attribtedString.id = 34print(attribtedString)// Outputhello world {    id = 34}

// 自定义属性的数据类型不限，只要满足需要的协议即可enum PriorityKey:CodableAttributedStringKey,MarkdownDecodableAttributedStringKey{    public enum Priority:String,Codable{ //如需在Markdown中解析，需要将raw类型设置为String,并符合Codable        case low        case normal        case high    }    static var name: String = "priority"    typealias Value = Priority}extension AttributeScopes{    public struct MyScope:AttributeScope{        let id:MyIDKey        let priority:PriorityKey // 将新创建的Key也添加到自定义的Scope中        let swiftUI:SwiftUIAttributes    }    var myScope:MyScope.Type{        MyScope.self    }}

// 在Markdown文本中解析自定义属性时，需指明Scope。var attributedString = AttributedString(localized: "^[hello world](priority:'low')",including: \.myScope)print(attributedString)// Outputhello world {    priority = low    NSLanguage = en}

enum SizeKey:CodableAttributedStringKey,MarkdownDecodableAttributedStringKey{    public struct Size:Codable,Hashable{        let width:Double        let height:Double    }    static var name: String = "size"    typealias Value = Size}// 在Scope中添加let size:SizeKey

// 多参数在{}内添加let attributedString = AttributedString(localized: "^[hello world](size:{width:343.3,height:200.3},priority:'high')",including: \.myScope)print(attributedString)// Outputello world {    priority = high    size = Size(width: 343.3, height: 200.3)    NSLanguage = en}