In NSURLSession HTTPBody must be NSData? - ios

Question

When I use AFNetworking to post parameters is NSMutableDictionary, this request is succeeded.
But when I used NSURLSession, the self.request!.HTTPBody must be NSData, so request failed.
How can I use NSURLSession to make request succeeded?
postDict[#"jgId"] = "1000000000";
[manager GET:SELECTDEPART parameters:postDict success:^(AFHTTPRequestOperation *operation, id responseObject) {
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(#"-----%#", error);
}];
//use NSData
NSJSONSerialization.dataWithJSONObject(postDict, options: NSJSONWritingOptions.PrettyPrinted)
Please help me.

Answer 1

let params = ["jgId": "1000000000"]
let data = try? JSONSerialization.data(withJSONObject: params, options: [JSONSerialization.WritingOptions(rawValue: 0)])
var request = URLRequest(url: URL(string: "https://my-url.com")!, cachePolicy: .returnCacheDataElseLoad, timeoutInterval: 30)
request.httpMethod = "POST"
request.httpBody = data
request.allHTTPHeaderFields = [:]
URLSession.shared.dataTask(with: request) { (data, response, error) in
}

Answer 2

You are correct, for NSURLSession you need NSData.
But you can easily convert an NSDictionary to NSData by using NSKeyedArchiver.

Answer 3

You are using GET method to request data from server, so your parameters is not sent by request HTTPBody data. Your params is simple past via request URL.
In question You have SELECTDEPART as base URL of request and postDict as parameter. The following code use NSURLSession to make GET request with parameters
// get request URL from base URL and params
NSURLComponents *components = [NSURLComponents componentsWithString:#"http://stackoverflow.com"]; // some thing like SELECTDEPART in your question
NSDictionary *params = #{ #"q": #"ios", #"count": #"10" }; // params of request like your postDict
NSMutableArray *queryItems = [NSMutableArray array];
for (NSString *key in params.allKeys) {
[queryItems addObject:[NSURLQueryItem queryItemWithName:key value:params[key]]];
}
components.queryItems = queryItems;
NSURL *url = components.URL;
// create request
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:url];
request.HTTPMethod = #"GET";
// data task with NSURLSession
NSURLSessionDataTask *task = [[NSURLSession sharedSession] dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
if (!error) {
// parse your data here
} else {
// handle error here
}
}];
[task resume];