Question

我想在下面的代码中设置内容类型来调用web api。内容类型为application/json; charset=utf-8

let url = NSURL(string: "http:/api/jobmanagement/PlusContactAuthentication?email=\(usr)&userPwd=\(pwdCode)")

println("URL:  \(url)")

let task = NSURLSession.sharedSession().dataTaskWithURL(url!) {
    (data, response, error) in
    println(NSString(data: data, encoding: NSUTF8StringEncoding))
}

//  task.setValue(<#value: AnyObject?#>, forKey: <#String#>)
task.resume()

Answer 1

如果您要设置请求的Content-Type，可以创建自己的NSMutableURLRequest，提供您的网址，使用Content-Type指定setValue:forHTTPHeaderField:标题，然后发出使用dataTaskWithRequest而不是dataTaskWithURL的请求。因此，在Swift 2中，您可以将request.HTTPBody设置为JSON并指定它是POST请求：

let request = NSMutableURLRequest(URL: url!)
request.setValue("application/json; charset=utf-8", forHTTPHeaderField: "Content-Type")  // the request is JSON
request.setValue("application/json; charset=utf-8", forHTTPHeaderField: "Accept")        // the expected response is also JSON
request.HTTPMethod = "POST"
request.updateBasicAuthForUser("test", password: "password1")

let dictionary = ["email": usr, "userPwd": pwdCode]
request.HTTPBody = try! NSJSONSerialization.dataWithJSONObject(dictionary, options: [])

let task = NSURLSession.sharedSession().dataTaskWithRequest(request) { data, response, error in
    guard let data = data where error == nil else {
        print(error)                                                // some fundamental network error
        return
    }

    do {
        let responseObject = try NSJSONSerialization.JSONObjectWithData(data, options: [])
        print(responseObject)
    } catch let jsonError {
        print(jsonError)
        print(String(data: data, encoding: NSUTF8StringEncoding))   // often the `data` contains informative description of the nature of the error, so let's look at that, too
    }
}
task.resume()

在Swift 3中，等效代码为：

var request = URLRequest(url: url!)
request.setValue("application/json; charset=utf-8", forHTTPHeaderField: "Content-Type")  // the request is JSON
request.setValue("application/json; charset=utf-8", forHTTPHeaderField: "Accept")        // the expected response is also JSON
request.httpMethod = "POST"

let dictionary = ["email": usr, "userPwd": pwdCode]
request.httpBody = try! JSONSerialization.data(withJSONObject: dictionary)

let task = URLSession.shared.dataTask(with: request) { data, response, error in
    guard let data = data, error == nil else {
        print(error)                                 // some fundamental network error
        return
    }

    do {
        let responseObject = try JSONSerialization.jsonObject(with: data)
        print(responseObject)
    } catch let jsonError {
        print(jsonError)
        print(String(data: data, encoding: .utf8))   // often the `data` contains informative description of the nature of the error, so let's look at that, too
    }
}
task.resume()

Answer 2

这对于我使用SWIFT 5进行API调用开发iOS应用程序非常有用。没有这两行，GET方法就可以正常工作。 PUT和POST方法会将值发送到API服务器，但是一旦到达服务器，它就无法解释JSON数据，因此我的数据库将为所有字段插入NULL值。添加这两行后，数据已正确传输到表中。希望这可以节省其他人的时间。

request.setValue("application/json; charset=utf-8", forHTTPHeaderField: "Content-Type")  
request.setValue("application/json; charset=utf-8", forHTTPHeaderField: "Accept")

如何使用NSURLSession在Swift中定义Content-type

2 个答案: