使用 swift 来自 URL 字符串“http://<Domain>/blaBla?id=Testid851211”的参数

Question

我有一个 URL 字符串“http:///blaBla?id=Testid851211”，我只想获取“851211”。
下面是我的代码：-

    let url: NSURL = NSURL(string: urlString)!
    Helper.sharedInstance.Print(url.query as AnyObject)

    if (url.query?.localizedStandardContains("testKey"))! {
        //TestKey
        Helper.sharedInstance.Print(url.query as AnyObject)
        let testValue = getQueryStringParameter(url: urlString, param: "testKey")
        Helper.sharedInstance.Print(testValue as AnyObject)
    }

    else if (url.query?.localizedStandardContains("testID"))! {
        //TestID
        Helper.sharedInstance.Print(url.query as AnyObject)
    }

   func getQueryStringParameter(url: String, param: String) -> String? {
    guard let url = URLComponents(string: url) else { return nil }
    return url.queryItems?.first(where: { $0.name == param })?.value
   }

我得到 id = Testid851211 但我只想要“851211”。

Answer 1

使用正则表达式仅过滤掉数字：

let urlString = "http:///blaBla?id=Testid851211"
let pattern = "[0-9]+"
if let matchRange = urlString.range(of: pattern, options: .regularExpression) {
    print(urlString[matchRange])
}

只要您的网址在其他任何地方都没有数字，就可以使用。

Answer 2

试试这个扩展：

extension String {

    func getNeededText(for url: String) -> String {
        guard range(of: url) != nil else { return "" }
        return replacingOccurrences(of: url, with: "")
    }

}

用法：

let predefinedHost = "http:///blaBla?id=Testid"
let url = "http:///blaBla?id=Testid851211"

url.getNeededText(for: predefinedHost) // prints "851211"