ios 网址(字符串 : ) not working always

Question

let testurl = "http://akns-
images.eonline.com/eol_images/Entire_Site/2018029/rs_1024x759-
180129200032-1024.lupita-nyongo-angela-bassett-black-panther-
premiere.ct.012918.jpg?fit=inside|900:auto"

if let url = URL(string: testurl){
    print("valid")
}else {
   print("invalid")
}

这将打印为无效的 URL。但在网络浏览器中显示图像。我见过很多方法，但它会抛出 Apple 警告以使用 stringByAddingPercentEncodingWithAllowedCharacters 并且这并不总是有效。

我更喜欢一个解决方案来清理 url 而无需对完整的 urlstring 进行编码。在传递给外部库时，在初始步骤对其进行编码可能会产生摩擦，外部库将重新编码 url 并使其无效。

Answer 1

使用URLComponents，它会自动处理转义字符并正确编码url。无需使用 addingPercentEncoding

func computeURL() {
    let testurlStr = "http://akns-images.eonline.com/eol_images/Entire_Site/2018029/rs_1024x759-180129200032-1024.lupita-nyongo-angela-bassett-black-panther-premiere.ct.012918.jpg?fit=inside|900:auto"
    let components = transformURLString(testurlStr)

    if let url = components?.url {
        print("valid")
    } else {
        print("invalid")
    }
}

func transformURLString(_ string: String) -> URLComponents? {
    guard let urlPath = string.components(separatedBy: "?").first else {
        return nil
    }
    var components = URLComponents(string: urlPath)
    if let queryString = string.components(separatedBy: "?").last {
        components?.queryItems = []
        let queryItems = queryString.components(separatedBy: "&")
        for queryItem in queryItems {
            guard let itemName = queryItem.components(separatedBy: "=").first,
                  let itemValue = queryItem.components(separatedBy: "=").last else {
                    continue
            }
            components?.queryItems?.append(URLQueryItem(name: itemName, value: itemValue))
        }
    }
    return components!
}