使用不允许的字符编码url swift，无法将％20编码为％2520

Question

以下是我的URL编码代码

extension String {
var encoded: String {
    return self.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed) ?? ""
  }
}

但是如果网址包含％20，我将面临问题。它已将其编码为％2520，尽管我已添加urlQueryAllowed

原始网址：https://mydomain.in/retailers_data_v2/retailer/320/17372-Tea%20Coffee%20Vending%20Machine.JPG

编码网址：https://mydomain.in/retailers_data_v2/retailer/320/17372-Tea%2520Coffee%2520Vending%2520Machine.JPG

Answer 1

如果您已经编码了URL字符串，则首先需要删除百分比编码，然后再应用它。

如果不确定所使用的URL是否已经编码，则可以简单地在if let上使用removingPercentEncoding，并根据其结果，对原始URL或对原始URL调用addingPercentEncoding您从中删除了编码。

let alreadyEncodedURLString = "https://mydomain.in/retailers_data_v2/retailer/320/17372-Tea%20Coffee%20Vending%20Machine.JPG"
if let unencodedURLString = alreadyEncodedURLString.removingPercentEncoding {
    unencodedURLString.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed)
} else {
    alreadyEncodedURLString.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed)
}