如何使用 swift ui 显示突出显示的单词

Question

var str:String = "当我 ###young$$$ 的时候，我认为 ###time$$$ 就是金钱" VStsck{ 文本（字符串） } enter image description here

Answer 1

您可以使用正则表达式解析字符串并根据找到的范围构建Text：

struct HighlightedText: View{
    let text: Text
    
    private static let regularExpression = try! NSRegularExpression(
        pattern: "###(?<content>((?!\\$\\$\\$).)*)\\$\\$\\$"
    )
    
    private struct SubstringRange {
        let content: NSRange
        let full: NSRange
    }
    
    init(_ string: String) {
        let ranges = Self.regularExpression
            .matches(
                in: string,
                options: [],
                range: NSRange(location: 0, length: string.count)
            )
            .map { match in
                SubstringRange(
                    content: match.range(withName: "content"),
                    full: match.range(at: 0)
                )
            }
        var nextNotProcessedSymbol = 0
        var text = Text("")
        let nsString = string as NSString
        func appendSubstringStartingNextIfNeeded(until endLocation: Int) {
            if nextNotProcessedSymbol < endLocation {
                text = text + Text(nsString.substring(
                    with: NSRange(
                        location: nextNotProcessedSymbol,
                        length: endLocation - nextNotProcessedSymbol
                    )
                ))
            }
        }
        for range in ranges {
            appendSubstringStartingNextIfNeeded(until: range.full.location)
            text = text + Text(nsString.substring(with: range.content))
                .foregroundColor(Color.red)
            nextNotProcessedSymbol = range.full.upperBound
        }
        appendSubstringStartingNextIfNeeded(until: string.count)
        self.text = text
    }
    
    var body: some View {
        text
    }
}

用法：

HighlightedText("When I was ###young$$$, I thought ###time$$$ was money")

Answer 2

func hilightText(str:String) -> Text{
   var resultText:Text = Text("")
   if(str.contains("###")){
        let titleArr:Array<String> = str.components(spearatedBy:"###")
        for(title in titleArr){
            resultText = resultText 
            + Text(title.components(spearatedBy:"$$$")[0]).foregroundColor(Color.red)
            + Text(title.components(spearatedBy:"$$$")[1]).foregroundColor(Color.gray)
        }else{
            resultText = resultText + Text(title).foregroundColor(Color.gray)
        }
   }
   return resultText 
}else{
   return Text(str).foregroundColor(Color.gray)
}

struct View1:View{
     @State var title = "When I was ###young$$$, I thought ###time$$$ was money"
     var body : some View{
         hilightText(str:title)
     }
}