Metoda delegata NSURLConnection

Question

Mam trudności ze znalezieniem przykładów implementacji metod delegowania NSURLConnection.

Chcę wysłać dane za pomocą postu HTTP za pomocą kliknięcia przycisku. Nie wiem, jak zrobić "przesłany" ekran i "przesłany". (Wiem, jak używać spinnera i będę z nich korzystać)

Używam tego kodu pod działaniem kliknięcia, ale nie można użyć żadnych elementów delegowanych. Nie wiem, jak zaimplementować je w mojej obecnej konfiguracji.

NSMutableURLRequest *request = 
    [[NSMutableURLRequest alloc] initWithURL: 
    [NSURL URLWithString:@"http://myURL.com"]]; 

    [request setHTTPMethod:@"POST"]; 

    NSString *postString = [wait stringByAppendingString:co]; 

    [request setValue:[NSString 
         stringWithFormat:@"%d", [postString length]] 
    forHTTPHeaderField:@"Content-length"]; 



    [request setHTTPBody:[postString 
          dataUsingEncoding:NSUTF8StringEncoding]]; 

    //[[NSURLConnection alloc] initWithRequest:request delegate:self]; 
    [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil]; 


    [SVProgressHUD dismissWithSuccess:@"Submission Successful"]; 

Answer 1

Trzeba korzystać z nowego protokołu NSURLConnectionDataDelegate.

znalazłem kilka exemples tutaj:

http://blog.kemalkocabiyik.com/index.php/2012/02/fetching-data-with-getpost-methods-by-using-nsurlconnection/

A jeśli można przeczytać portugalski: http://www.quaddro.com.br/blog/desenvolvimento-ios/baixando-conteudo-com-nsurlconnection-e-nsurlconnectiondatadelegate-no-ios

Answer 2

- (void)connection:(NSURLConnection*)connection didReceiveResponse:(NSURLResponse *)response 
{ 
    NSLog(@"Did Receive Response %@", response); 
    responseData = [[NSMutableData alloc]init]; 
} 
- (void)connection:(NSURLConnection*)connection didReceiveData:(NSData*)data 
{ 
    //NSLog(@"Did Receive Data %@", data); 
    [responseData appendData:data]; 
} 
- (void)connection:(NSURLConnection*)connection didFailWithError:(NSError*)error 
{ 
    NSLog(@"Did Fail"); 
} 
- (void)connectionDidFinishLoading:(NSURLConnection *)connection 
{ 
    NSLog(@"Did Finish"); 
    // Do something with responseData 
} 

Answer 3

//Connection request 
-(void)requestURL:(NSString *)strURL 
    { 
     // Create the request. 
     NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:strURL]]; 

     // Create url connection and fire request 
     NSURLConnection *conn = [[NSURLConnection alloc] initWithRequest:request delegate:self]; 

    } 


    //Delegate methods 
    - (void)connection:(NSURLConnection*)connection didReceiveResponse:(NSURLResponse *)response 
    { 
     NSLog(@"Did Receive Response %@", response); 
     responseData = [[NSMutableData alloc]init]; 
    } 
    - (void)connection:(NSURLConnection*)connection didReceiveData:(NSData*)data 
    { 
     //NSLog(@"Did Receive Data %@", data); 
     [responseData appendData:data]; 
    } 
    - (void)connection:(NSURLConnection*)connection didFailWithError:(NSError*)error 
    { 
     NSLog(@"Did Fail"); 
    } 
    - (void)connectionDidFinishLoading:(NSURLConnection *)connection 
    { 
     NSLog(@"Did Finish"); 
     // Do something with responseData 

     NSString *strData=[[NSString alloc] initWithData:responseData encoding:NSASCIIStringEncoding]; 

     NSLog(@"Responce:%@",strData); 
    } 

http://codewithchris.com/tutorial-how-to-use-ios-nsurlconnection-by-example/

Answer 4

w tym kodzie można wykorzystać GCD, wskaźnik aktywności, UIButton Action na przycisku logowania Najpierw wil Wzywam StartActivityindicator w innym wątku i cały czas się poruszam, aż usuniesz lub zatrzymasz Activityindicator. następnie wywołasz usługę sieciową w celu zalogowania się w kolejce GCD. w momencie otrzymania odpowiedzi z głównej kolejki wywołania serwera w celu zaktualizowania interfejsu użytkownika.

// After the interface declration 
@interface LoginViewController() 
{ 

NSData *responseData; 
dispatch_queue_t myqueue; 

}  
//Button Action 
- (IBAction)Login_Button_Action:(id)sender 

{ 

[NSThread detachNewThreadSelector: @selector(StartActivityindicator) toTarget:self withObject:nil]; 
myqueue =dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0); 
dispatch_group_t group=dispatch_group_create(); 
dispatch_group_async(group, myqueue, ^{ [self loginWebService];}); 
} 
-(void)loginWebService 
{ 
//Combine Both url and parameters 
    NSString *UrlWithParameters = [NSString stringWithFormat:@"http://www.xxxxx.com?count=%@&user=%@&email=%@&password=%@",@"4",@"Username",s@"UserEmail",@"PAssword String"]; 
//Pass UrlWithParameters to NSURL 
NSURL *ServiceURL =[NSURL URLWithString:UrlWithParameters]; 

NSMutableURLRequest *serviceRequest =[NSMutableURLRequest requestWithURL:ServiceURL]; 
[serviceRequest setHTTPMethod:@"POST"]; 

[serviceRequest setValue:@"application/json" forHTTPHeaderField:@"accept"]; 
[serviceRequest setValue:@"application/json" forHTTPHeaderField:@"content-type"]; 

//GEt Response Here 
NSError *err; 
NSURLResponse *response; 
responseData = [NSURLConnection sendSynchronousRequest:serviceRequest returningResponse:&response error:&err]; 

NSHTTPURLResponse* httpResponse = (NSHTTPURLResponse*)response; 
NSInteger code = [httpResponse statusCode]; 
// check status code for response from server and do RND for code if you recive anything than 200 
NSLog(@"~~~~~ Status code: %ld",(long)code); 
if (code ==200) 
{ 
// your response is here if you call right 
    NSArray *jsonArray = [NSJSONSerialization JSONObjectWithData:responseData options: NSJSONReadingMutableContainers error: &err]; 

dispatch_async(dispatch_get_main_queue(),^{ 
     // place the code here to update UI with your received response 
     [NSThread detachNewThreadSelector: @selector(StopActivityindicator) toTarget:self withObject:nil]; 
     }); 
} 
} 
//Activity indicator Method to display 
- (void) StartActivityindicator 
{ 
mySpinner.hidden = NO; 
[mySpinner startAnimating]; 
} 
- (void) StopActivityindicator 
{ 
mySpinner.hidden = YES; 
[mySpinner stopAnimating]; 
}