Get JSON Results with POST Request with Parameters - json

Question

How can I use a POST request with parameters to get JSON? I know how to do it with a simple GET request. The request url is http://gyminyapp.azurewebsites.net/api/Gym and the parameter query is
{
"SearchCircle": {
"Center": {
"Latitude": 0,
"Longitude": 0
},
"Radius": 0
},
"City": "string",
"ZipCode": 0,
"Type": "string"
}
I'm wanting to just use the search circle portion of this, which means I can ignore the City and ZipCode fields. I need to provide Latitude/Longitude, which I getting from the current user location. I also need to set the Type to "radius".
For a simple GET request using the GET version of this, I do this.
let url = NSURL(string: "http://gyminyapp.azurewebsites.net/api/Gym")
let data = NSData(contentsOfURL: url!)
do {
let json = try NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.MutableContainers)
for gym in json as! [AnyObject] {
gyms.append(gym)
}
} catch {
print("Error")
}

Answer 1

This is a working code, you just need to put the values of your request parameters.
let session = NSURLSession.sharedSession()
let url = "http://gyminyapp.azurewebsites.net/api/Gym"
let request = NSMutableURLRequest(URL: NSURL(string: url)!)
request.HTTPMethod = "POST"
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
let params:[String: AnyObject] = ["Type" : "string","SearchCircle" : ["Radius" : 0, "Center" : ["Latitude" : 0, "Longitude" : 0]]]
do{
request.HTTPBody = try NSJSONSerialization.dataWithJSONObject(params, options: NSJSONWritingOptions())
let task = session.dataTaskWithRequest(request, completionHandler: {(data, response, error) in
if let response = response {
let nsHTTPResponse = response as! NSHTTPURLResponse
let statusCode = nsHTTPResponse.statusCode
print ("status code = \(statusCode)")
}
if let error = error {
print ("\(error)")
}
if let data = data {
do{
let jsonResponse = try NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions())
print ("data = \(jsonResponse)")
}catch _ {
print ("OOps not good JSON formatted response")
}
}
})
task.resume()
}catch _ {
print ("Oops something happened buddy")
}
Then in the if let data = data you'd need to parse the response. I checked the response, it is JSON formatted array.

Answer 2

This is how I did it. Just make an NSDictionary out of params and convert to NSData, I called that postData. And then the usual, send that postData as requestBody
let parameters = [
"SearchCircle":
[ "Center" :
["Latitude" : 0,
"Longitude" : 0] ]
"Radius" : 0,
"City" : "", ...
... and so on
] ]
do
{
let postData = try NSJSONSerialization.dataWithJSONObject(parameters, options: .PrettyPrinted)
let request = NSMutableURLRequest(URL: NSURL(string: "http...")!,
cachePolicy: .UseProtocolCachePolicy,
timeoutInterval: 10.0)
request.HTTPMethod = "POST"
request.HTTPBody = postData
let session = NSURLSession.sharedSession()
let dataTask = session.dataTaskWithRequest(request, completionHandler: { (data, response, error) -> Void in
if (error != nil) {
print(error)
} else {
let httpResponse = response as? NSHTTPURLResponse
print(httpResponse)
do {
// JSON serialization
self.dictionary = try NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions()) as! NSDictionary
// if any data
}
catch {
}
}
})
dataTask.resume()
}
catch {
}

Answer 3

This is the accepted answer's code updated for Swift 4:
let url = "http://gyminyapp.azurewebsites.net/api/Gym"
let session = URLSession.shared
let request = NSMutableURLRequest(url: URL(string: url))
request.httpMethod = "POST"
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
let params:[String: AnyObject] = ["Type" : "string",
"SearchCircle" : ["Radius" : 0, "Center" : ["Latitude" : 0, "Longitude" : 0]]]
do{
request.httpBody = try JSONSerialization.data(withJSONObject: parameters, options: JSONSerialization.WritingOptions())
let task = session.dataTask(with: request as URLRequest, completionHandler: {(data, response, error) in
if let response = response {
let nsHTTPResponse = response as! HTTPURLResponse
let statusCode = nsHTTPResponse.statusCode
print ("status code = \(statusCode)")
}
if let error = error {
print ("\(error)")
}
if let data = data {
do{
let jsonResponse = try JSONSerialization.jsonObject(with: data, options: JSONSerialization.ReadingOptions())
print ("data = \(jsonResponse)")
}catch _ {
print ("OOps not good JSON formatted response")
}
}
})
task.resume()
}catch _ {
print ("Oops something happened buddy")
}
}