swift - 如何对 URL 进行编码以在 Swift 中传递百分比 (%) 符号？

Question

我需要这样的 URL 才能工作:

https://somehost.gov/api/wtk_download.csv?api_key=DEMO_KEY&wkt=POINT(-104.23828125%252039.90973623454)&attributes=power&names=2009&interval=60&full_name=SampleUser&email=sample@email.com&affiliation=TestOrganization&reason=Dev

我用来生成 URL 的代码:

let wktStr: String = "POINT("+formattedX+"%"+formattedY+")"
var components = URLComponents()
components.scheme = "https"
components.host = "somehost.gov"
components.path = "/api/wtk_download.csv"
components.queryItems = [
    URLQueryItem(name: "api_key", value: "DEMO_KEY"),
    URLQueryItem(name: "wkt", value: wktStr),
    URLQueryItem(name: "attributes", value: "power"),
    URLQueryItem(name: "names", value: yearString),
    URLQueryItem(name: "interval", value: "60"),
    URLQueryItem(name: "full_name", value: "SampleUser"),
    URLQueryItem(name: "email", value: "sample@email.com"),
    URLQueryItem(name: "affiliation", value: "TestOrganization"),
    URLQueryItem(name: "reason", value: "Dev")

]

let url = components.url
print(url!)
print(url!.absoluteURL)

打印:

https://somehost.gov/api/wtk_download.csv?api_key=DEMO_KEY&wkt=POINT(-104.23828125%252039.90973623454)&attributes=power&names=2009&interval=60&full_name=SampleUser&email=sample@email.com&affiliation=TestOrganization&reason=Dev

服务器主机出错，因为 POINT(-104.23828125%252039.90973623454) 有 %25 而不是只有 %。

如何生成只有 % 的项目 POINT(-104.23828125%2039.90973623454)？

Answer 1

看起来您正在尝试使用 Wind Toolkit Data API . (截至 2023 年 1 月的更新:这是撰写此问题时原始链接的样子:Wind Toolkit Data API)

在您写这个问题时，在他们的一个示例请求中，该页面有一个如下所示的查询参数:

wkt=POINT(-104.23828125%2039.90973623453719)

%20 实际上只是一个 URL-encoded空格字符。

(是他们如何为 wkt 参数显示 URL 编码值，但对于值包含空格的其他参数，如 full_name =Sample User 或 affiliation=Test Organization，所以混淆的来源是可以理解的。)

无论如何，要解决此问题，只需将 wktStr 中的 % 字符替换为空格即可:

let wktStr: String = "POINT("+formattedX+" "+formattedY+")"