从 HTML 键值中获取数据

Question

我想从 HTML 中获取键值。 目前使用 swift soup 按索引获取元素。 如果网站元素索引发生变化，我将无法获取该值。 想根据键检索值 下面是示例 HTML：

<table class="Tbl"><tbody><tr><td colspan="4" style="background-color:#D49F3E"><div class="Val" style="text-align:center;color:#540000">Saturday, December 30, 2017</div></td></tr><tr><td style="width:18%"><div class="Key">Sunrise:</div></td><td style="width:32%"><div class="Val">06:30</div></td><td style="width:18%"><div class="Key">Sunset:</div> </td><td style="width:32%"><div class="Val">17:52</div></td></tr>

我现在的密码是

do{
   let htmlContent = html
    do{
        let doc =  try SwiftSoup.parse(htmlContent as String)
        do{
            let element = try doc.select("[class=Val]").array()
            do{
                let today = try element[0].text()
                let Sunrise = try element[1].text()
                print(today)
                print(Sunrise)
            }catch{
            }
        }catch{
        }
    }catch{
    }
}

请教如何通过钥匙获取阀门

EDIT-1： 试图申请。在代码下方并出现错误。有什么建议吗？

let data = try? Data(contentsOf: url! as URL)
        let html = NSString(data: data!, encoding: String.Encoding.utf8.rawValue)!

        do{
            let html1: String = html as String
            let els: Elements = try SwiftSoup.parse(html1).getElementsByClass("Tbl")
            for keyVal: Element in els.array(){
                let keyValText: String = try keyVal.text()
                print(keyValText)
                let components = keyValText
                    .components(separatedBy: .newlines)
                    .filter{
                        !$0.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty
                }
                if let index = components.index(where: {$0.contains(find: "Sunrise")}){
                    let sunriseTest = components[components.index(after: index)] //Error : Thread 1: Fatal error: Index out of range
                    print("sunriseTest: ", sunriseTest)
                }else{

                }
            }

        }catch Exception.Error(let type, let message){
            print(message)
        }catch{
            print("error")
        }

Answer 1

您可以将您的 html 转换为字符串，并让组件由 newLines 分隔。要修复索引问题，只需过滤修剪空白后为空的行：

struct Sun {
    let date: String
    let sunset: String
    let sunrise: String
    init?(string: String) {
        guard string.count > 4 else { return nil }
        let components = string
            .components(separatedBy: .newlines)
            .filter {
                !$0.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty
        }
        date = components[0]
        sunset = components[2]
        sunrise = components[4]
    }
    init?(data: Data) throws {
        self.init(string: try NSAttributedString(data: data, options: [.documentType: NSAttributedString.DocumentType.html, .characterEncoding: String.Encoding.utf8.rawValue], documentAttributes: nil).string)
    }
}

---

游乐场测试：

let html1 = """
<table class="Tbl"><tbody><tr><td colspan="4" style="background-color:#D49F3E"><div class="Val" style="text-align:center;color:#540000">Saturday, December 30, 2017</div></td></tr><tr><td style="width:18%"><div class="Key">Sunrise:</div></td><td style="width:32%"><div class="Val">06:30</div></td><td style="width:18%"><div class="Key">Sunset:</div> </td><td style="width:32%"><div class="Val">17:52</div></td></tr>
"""
let html2 = """
<table class="Tbl"><tbody><tr><td colspan="4" style="background-color:#D49F3E"><div class="Val" style="text-align:center;color:#540000">Saturday, December 30, 2017</div></td></tr><tr><td style="width:18%"><div class="Key">Sunrise:</div></td><td style="width:32%"><div class="Val">06:30</div></td><td style="width:18%"><div class="Key">&nbsp;</div></td><td style="width:32%"><div class="Val">&nbsp;</div></td><td style="width:18%"><div class="Key">Sunset:</div> </td><td style="width:32%"><div class="Val">17:52</div></td></tr>
"""

---

do {
    if let sun = try Sun(data: Data(html2.utf8)) {
        print("Today:", sun.date)
        print("Sunset:", sun.sunset)
        print("Sunrise:",sun.sunrise)
    }
} catch {
    print(error)
}

今天：2017 年 12 月 30 日星期六日落：06:30 日出：17:52