如何使用 swift ui 显示突出显示的单词

Posted 2023-02-24

【中文标题】如何使用 swift ui 显示突出显示的单词

【英文标题】：How to display highlighted words using swift ui

【发布时间】：2021-08-23 07:47:04

【问题描述】：

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

【问题讨论】：

这是否回答了您的问题***.com/a/61671431/12299030？还是这个***.com/a/59531328/12299030？

感谢回答，我知道用Text()+Text()，但是我的字符串是变量，我只知道###$$里面包含了需要高亮的字符$，我使用 ios 14 swift5

然后你只需要像***.com/a/62111947/12299030一样解析它并组合结果

【参考方案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")

【参考方案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)
     

【讨论】：

我找到了一个简单的解决方案，虽然看起来并不优雅