How to send POST and GET request? - objective-c

Question

I want to send my JSON to a URL (POST and GET).
NSMutableDictionary *JSONDict = [[NSMutableDictionary alloc] init];
[JSONDict setValue:"myValue" forKey:"myKey"];
NSData *JSONData = [NSJSONSerialization dataWithJSONObject:self options:kNilOptions error:nil];
My current request code isn't working.
NSMutableURLRequest *requestData = [[NSMutableURLRequest alloc] init];
[requestData setURL:[NSURL URLWithString:#"http://fake.url/"];];
[requestData setHTTPMethod:#"POST"];
[requestData setValue:postLength forHTTPHeaderField:#"Content-Length"];
[requestData setValue:#"application/json" forHTTPHeaderField:#"Content-Type"];
[requestData setValue:#"application/json" forHTTPHeaderField:#"Accept"];
[requestData setHTTPBody:postData];
Using ASIHTTPRequest is not a liable answer.

Answer 1

Sending POST and GET requests in iOS is quite easy; and there's no need for an additional framework.
POST Request:
We begin by creating our POST's body (ergo. what we'd like to send) as an NSString, and converting it to NSData.
objective-c
NSString *post = [NSString stringWithFormat:#"test=Message&this=isNotReal"];
NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
Next up, we read the postData's length, so we can pass it along in the request.
NSString *postLength = [NSString stringWithFormat:#"%d", [postData length]];
Now that we have what we'd like to post, we can create an NSMutableURLRequest, and include our postData.
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
[request setURL:[NSURL URLWithString:#"http://YourURL.com/FakeURL"]];
[request setHTTPMethod:#"POST"];
[request setValue:postLength forHTTPHeaderField:#"Content-Length"];
[request setHTTPBody:postData];
swift
let post = "test=Message&this=isNotReal"
let postData = post.data(using: String.Encoding.ascii, allowLossyConversion: true)
let postLength = String(postData!.count)
var request = URLRequest(url: URL(string: "http://YourURL.com/FakeURL/PARAMETERS")!)
request.httpMethod = "POST"
request.addValue(postLength, forHTTPHeaderField: "Content-Length")
request.httpBody = postData;
And finally, we can send our request, and read the reply by creating a new NSURLSession:
objective-c
NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];
[[session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
NSString *requestReply = [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding];
NSLog(#"Request reply: %#", requestReply);
}] resume];
swift
let session = URLSession(configuration: .default)
session.dataTask(with: request) {data, response, error in
let requestReply = NSString(data: data!, encoding: String.Encoding.ascii.rawValue)
print("Request reply: \(requestReply!)")
}.resume()
GET Request:
With the GET request it's basically the same thing, only without the HTTPBody and Content-Length.
objective-c
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
[request setURL:[NSURL URLWithString:#"http://YourURL.com/FakeURL/PARAMETERS"]];
[request setHTTPMethod:#"GET"];
NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];
[[session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
NSString *requestReply = [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding];
NSLog(#"Request reply: %#", requestReply);
}] resume];
swift
var request = URLRequest(url: URL(string: "http://YourURL.com/FakeURL/PARAMETERS")!)
request.httpMethod = "GET"
let session = URLSession(configuration: .default)
session.dataTask(with: request) {data, response, error in
let requestReply = NSString(data: data!, encoding: String.Encoding.ascii.rawValue)
print("Request reply: \(requestReply!)")
}.resume()
On a side note, you can add Content-Type (and other data) by adding the following to our NSMutableURLRequest. This might be required by the server when requesting, e.g, a json.
objective-c
[request setValue:#"application/json" forHTTPHeaderField:#"Content-Type"];
[request setValue:#"application/json" forHTTPHeaderField:#"Accept"];
Response code can also be read using [(NSHTTPURLResponse*)response statusCode].
swift
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
request.addValue("application/json", forHTTPHeaderField: "Accept")
Update: sendSynchronousRequest is deprecated from ios9 and osx-elcapitan (10.11) and out.
NSURLResponse *requestResponse; NSData *requestHandler = [NSURLConnection sendSynchronousRequest:request returningResponse:&requestResponse error:nil]; NSString *requestReply = [[NSString alloc] initWithBytes:[requestHandler bytes] length:[requestHandler length] encoding:NSASCIIStringEncoding]; NSLog(#"requestReply: %#", requestReply);

Answer 2

By using RestKit you can make a simple POST request (see this GitHub page for more details).
Import RestKit in your header file.
#import <RestKit/RestKit.h>
Then you can start by creating a new RKRequest.
RKRequest *MyRequest = [[RKRequest alloc] initWithURL:[[NSURL alloc] initWithString:#"http://myurl.com/FakeUrl/"]];
Then specify what kind of request you want to make (in this case, a POST request).
MyRequest.method = RKRequestMethodPOST;
MyRequest.HTTPBodyString = YourPostString;
And then set your request as a JSON in additionalHTTPHeaders.
MyRequest.additionalHTTPHeaders = [[NSDictionary alloc] initWithObjectsAndKeys:#"application/json", #"Content-Type", #"application/json", #"Accept", nil];
Finally, you can send the request.
[MyRequest send];
Additionally you can NSLog your request to see the outcome.
RKResponse *Response = [MyRequest sendSynchronously];
NSLog(#"%#", Response.bodyAsString);
Sources: RestKit.org and Me.

Answer 3

-(void)postmethod
{
NSString * post =[NSString stringWithFormat:#"Email=%#&Password=%#",_txt_uname.text,_txt_pwd.text];
NSData *postdata= [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
NSString *postLength=[NSString stringWithFormat:#"%lu",(unsigned long)[postdata length]];
NSMutableURLRequest *request= [[NSMutableURLRequest alloc]init];
NSLog(#"%#",app.mainurl);
// NSString *str=[NSString stringWithFormat:#"%#Auth/Login",app.mainurl];
NSString *str=YOUR URL;
[request setURL:[NSURL URLWithString:str]];
[request setHTTPMethod:#"POST"];
[request setValue:postLength forHTTPHeaderField:#"Content-Length"];
[request setValue:#"application/x-www-form-urlencoded" forHTTPHeaderField:#"Content-Type"];
[request setHTTPBody:postdata];
NSError *error;
NSURLResponse *response;
NSData *urlData=[NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
NSString *returnstring=[[NSString alloc]initWithData:urlData encoding:NSUTF8StringEncoding];
NSMutableDictionary *dict=[returnstring JSONValue];
NSLog(#"%#",dict);
}
-(void)GETMethod
{
NSString *appurl;
NSString *temp =#"YOUR URL";
appurl = [NSString stringWithFormat:#"%#uid=%#&cid=%ld",temp,user_id,(long)clubeid];
appurl = [appurl stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSMutableURLRequest *request=[NSMutableURLRequest requestWithURL:[NSURL URLWithString:appurl]];
NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse: nil error: nil ];
NSString *returnString = [[NSString alloc] initWithData:returnData encoding: NSUTF8StringEncoding];
NSMutableDictionary *dict_eventalldata=[returnString JSONValue];
NSString *success=[dict_eventalldata objectForKey:#"success"];
}

Answer 4

view control.h
#interface ViewController UIViewController<UITableViewDataSource,UITableViewDelegate>
#property (weak, nonatomic) IBOutlet UITableView *tableView;
#property (strong,nonatomic)NSArray *array;
#property NSInteger select;
#end
view.m
- (void)viewDidLoad {
[super viewDidLoad];
NSString *urlString = [NSString stringWithFormat: #"https://maps.googleapis.com/maps/api/place/nearbysearch/json?location=11.021459,76.916332&radius=2000&types=atm&sensor=false&key=AIzaS yD7c1IID7zDCdcfpC69fC7CUqLjz50mcls"];
NSURL *url = [NSURL URLWithString: urlString];
NSData *data = [NSData dataWithContentsOfURL:url];
NSDictionary *jsonData = [NSJSONSerialization JSONObjectWithData:
data options: 0 error: nil];
_array = [[NSMutableArray alloc]init];
_array = [[jsonData objectForKey:#"results"] mutableCopy];
[_tableView reloadData];}
// Do any additional setup after loading the view, typically from a
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView
numberOfRowsInSection:(NSInteger)section {
return _array.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView
cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *cellid = #"cell";
UITableViewCell *cell = [tableView
dequeueReusableCellWithIdentifier:cellid];
cell = [[UITableViewCell
alloc]initWithStyle:UITableViewCellStyleSubtitle
reuseIdentifier:cellid];
cell.textLabel.text = [[_array
valueForKeyPath:#"name"]objectAtIndex:indexPath.row];
cell.detailTextLabel.text = [[_array
valueForKeyPath:#"vicinity"]objectAtIndex:indexPath.row];
NSURL *imgUrl = [NSURL URLWithString:[[_array
valueForKey:#"icon"]objectAtIndex:indexPath.row]];
NSData *imgData = [NSData dataWithContentsOfURL:imgUrl];
cell.imageView.layer.cornerRadius =
cell.imageView.frame.size.width/2;
cell.imageView.layer.masksToBounds = YES;
cell.imageView.image = [UIImage imageWithData:imgData];
return cell;
}
#end
tablecell.h
#interface TableViewCell : UITableViewCell
#property (weak, nonatomic) IBOutlet UIImageView *imgView;
#property (weak, nonatomic) IBOutlet UILabel *lblName;
#property (weak, nonatomic) IBOutlet UILabel *lblAddress;