带参数的Swift GET请求

我是新手,所以我的代码可能会出现很多错误,但是我要实现的目标是将GET请求发送到带有

参数的localhost服务器。鉴于我的函数有两个参数,我试图做到更多baseURL:string,params:NSDictionary。我不确定如何将两者结合到实际的URLRequest中?到目前为止,这是我尝试过的

    func sendRequest(url:String,params:NSDictionary){

let urls: NSURL! = NSURL(string:url)

var request = NSMutableURLRequest(URL:urls)

request.HTTPMethod = "GET"

var data:NSData! = NSKeyedArchiver.archivedDataWithRootObject(params)

request.HTTPBody = data

println(request)

var session = NSURLSession.sharedSession()

var task = session.dataTaskWithRequest(request, completionHandler:loadedData)

task.resume()

}

}

func loadedData(data:NSData!,response:NSURLResponse!,err:NSError!){

if(err != nil){

println(err?.description)

}else{

var jsonResult: NSDictionary = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: nil) as NSDictionary

println(jsonResult)

}

}

回答:

建立GET请求时,请求的主体没有,但是所有内容都放在URL上。要构建网址(并正确地将其转义),

您还可以使用URLComponents.

var url = URLComponents(string: "https://www.google.com/search/")!

url.queryItems = [

URLQueryItem(name: "q", value: "War & Peace")

]

唯一的窍门是,大多数Web服务都需要+转义字符百分比

(因为它们会将其解释为application/x-www-form-urlencoded规范规定的空格字符)。但是URLComponents不会百分百逃脱它。Apple认为这+是查询中的有效字符,因此不应

转义。从技术上讲,它们是正确的,它可以在URI查询中使用,但它在application/x-www-form-urlencoded请求中具有特殊含义,实际上不应未经转义地传递。

苹果公司承认我们必须对+字符进行转义,但

建议我们手动进行:

var url = URLComponents(string: "https://www.wolframalpha.com/input/")!

url.queryItems = [

URLQueryItem(name: "i", value: "1+2")

]

url.percentEncodedQuery = url.percentEncodedQuery?.replacingOccurrences(of: "+", with: "%2B")

这是一个不太好的解决方法,但是它可以工作,这是Apple建议您的查询是否可以包含+字符并且您拥有将其解释为空格的服务器的建议。

因此,将其与sendRequest例行程序结合在一起,最终会得到

如下结果:

func sendRequest(_ url: String, parameters: [String: String], completion: @escaping ([String: Any]?, Error?) -> Void) {

var components = URLComponents(string: url)!

components.queryItems = parameters.map { (key, value) in

URLQueryItem(name: key, value: value)

}

components.percentEncodedQuery = components.percentEncodedQuery?.replacingOccurrences(of: "+", with: "%2B")

let request = URLRequest(url: components.url!)

let task = URLSession.shared.dataTask(with: request) { data, response, error in

guard let data = data, // is there data

let response = response as? HTTPURLResponse, // is there HTTP response

(200 ..< 300) ~= response.statusCode, // is statusCode 2XX

error == nil else { // was there no error, otherwise ...

completion(nil, error)

return

}

let responseObject = (try? JSONSerialization.jsonObject(with: data)) as? [String: Any]

completion(responseObject, nil)

}

task.resume()

}

And you’d call it like:

sendRequest("someurl", parameters: ["foo": "bar"]) { responseObject, error in

guard let responseObject = responseObject, error == nil else {

print(error ?? "Unknown error")

return

}

// use `responseObject` here

}

就我个人而言,JSONDecoder如今我会使用它并返回一个自定义struct而不是字典,但这在这里并不重要。希望这说明了如何将参数百分比编码到GET请求的URL中的基本思想。

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