calling custom and delegate method from another class

Question

I am a beginner in objective c. I have two classes Connectivity and SignInViewController, and what i want is to call the methods defined in a class on a single call from another class. I came to know that, i can achieve it through protocol or delegation, but still wondering if there would be any simple way to do this. when i debug the code, i can see that the control is going to the SigninViewController after executing the +(void)connectWithURL:(NSURL *)URL withData:(NSString *)postedData method. But what i want is to execute all the method(delegation methods defined below) of connectivity class first and after that control should go back to the SigninViewController. Hope, i asked it clearly.

`// connectivity.h

 #import<Foundation/Foundation.h>
@interface Connectivity : NSObject<NSURLConnectionDelegate, NSURLConnectionDelegate>
+(void)connectWithURL:(NSURL *)URL withData:(NSString *)postedData;
@end

//connectivity.m

#import "Connectivity.h"
NSMutableData *_receivedData;
@implementation Connectivity
+(void)connectWithURL:(NSURL *)URL withData:(NSString *)postedData
{
//Create the Request
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:URL];
NSLog(@"posted url %@", URL);
//Create The Method "POST"
[request setHTTPMethod:@"POST"];
//header
[request setValue:@"application/json" forHTTPHeaderField:@"Accept"];
[request setValue:@"application/x-www-form-urlencoded"   forHTTPHeaderField:@"Content-Type"];

//Pass the String to the Server
NSString *postString = [NSString stringWithString:postedData];

//Check the Passed Value
NSLog(@"post string =%@", postedData);
//Convert the String to Data
NSData *data1 = [postedData dataUsingEncoding:NSUTF8StringEncoding];
//Apply the Data to the Body
[request setHTTPBody:data1];
//connection to the webserver

NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request
                                                              delegate:self];
[connection start];
}
#pragma mark NSURLConnection Delegate Methods

-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{

[_receivedData setLength:0];
}
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
// Append the new data to receivedData.

[_receivedData appendData:data];
}
-(void)connectionDidFinishLoading:(NSURLConnection *)connection
{
// do something with the data

NSLog(@"Succeeded! Received %lul bytes of data",[_receivedData length]);
NSString *responeString = [[NSString alloc] initWithData:_receivedData
                                                encoding:NSUTF8StringEncoding];

connection = nil;
_receivedData = nil;
}
-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{

connection = nil;
_receivedData = nil;

// inform the user

NSLog(@"Connection failed! Error - %@ %@",
      [error localizedDescription],
      [[error userInfo] objectForKey:NSURLErrorFailingURLStringErrorKey]);
}
@end

//I am calling the method in (SignInViewController.m)

#import "SignInViewController.h"
#import "AlertMessageViewController.h"
#import "Connectivity.h"

@interface SignInViewController ()

@end

@implementation SignInViewController

- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
}
-(void)loginCustomUser
{

if([[self.emailTextField text] isEqualToString:@""] || [[self.passwordTextField text] isEqualToString:@""])
{
  [self presentViewController:[AlertMessageViewController alertWithTitle:@"Error" withMessage:@"Enter email and Password" preferredStyle:UIAlertControllerStyleAlert] animated:YES completion:nil];
}
else
{
NSString *data = [NSString stringWithFormat:@"{\"rqBody\":{\"emailId\":\"%@\",\"password\":\"%@\",\"userId\":\"%@\",\"idType\":\"%@\",\"firstName\":\"%@\",\"lastName\":\"%@\",\"contactNumber\":\"%@\",\"firstLineOfAddress\":\"%@\",\"localityName\":\"%@\",\"city\":\"%@\",\"state\":\"%@\",\"country\":\"%@\",\"roleType\":\"%@\",\"paymentProfile\":\"%@\",\"paymentDate\":\"%@\",\"registerationStatus\":\"%@\",\"loggedStatus\":\"%@\",\"lastLoggedInDate\":\"%@\",\"registerationDate\":\"%@\",\"profileStatus\":\"%@\"}}",[self.emailTextField text],[self.passwordTextField text],@"",@"",@"",@"",@"",@"",@"",@"",@"",@"",@"",@"",@"",@"",@"",@"",@"",@"",nil];

    NSURL *mainUrl= [NSURL URLWithString:@"http://192.168.1.5:8080/referamaid/app/noauth/signin"];

    [Connectivity connectWithURL:mainUrl withData:data];

}
}
@end`

TEdit the text agin, and separate the different different points, from different lines. — Arpit B Parekh, Jul 14 '15 at 08:12
Mention specifically, which two class you are talking about. also please give the meaning of, "what i want is to call the methods defined in a class on a single call from another class.". of this — Arpit B Parekh, Jul 14 '15 at 08:13
Edit again the question and make it more clear, more specific. — Arpit B Parekh, Jul 14 '15 at 08:14
Please 'what I want is to call the methods defined in one class on a single call from another class.' elaborate this line. — Arpit B Parekh, Jul 14 '15 at 17:09
Look first what will happen, that whenever your SignInViewcontroller's [Connectivity connectWithURL:mainUrl withData:data]; statement will be executed, then control goes to your delegate implementation of this method. and it will executed. Now I do not understand what exactly you want. — Arpit B Parekh, Jul 14 '15 at 17:14
yeah, i was expecting the same, but what actually happening is after executing [connection start] control goes to the SignInViewController and never come back to execute NSURLConnection delegation method. — Kunal Kumar, Jul 14 '15 at 17:28
You are saying that connection should receive response/data methods are not getting executed. Not even in your connectivity.m class.. — Arpit B Parekh, Jul 14 '15 at 17:33
It gets executed in the class itself, i have tested the code of Connectivity class seperately and its working fine. But the problem is when i call method [Connectivity connectWithURL:mainUrl withData:data]; from SingInController class, the connection should receive response/data methods are not getting executed. — Kunal Kumar, Jul 14 '15 at 17:38
that's what it will done, you have to use delegate method to transfer the control to the SignInViewController, — Arpit B Parekh, Jul 14 '15 at 17:40
Put this method in Connection didReceve response method in connectivity .m class. — Arpit B Parekh, Jul 14 '15 at 17:42

score 0 · Answer 1 · answered Jul 14 '15 at 17:45

- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{

    NSString *response = [[NSString alloc] initWithData:receivedData encoding:NSUTF8StringEncoding];

//      NSLog(@"%@",response);
//    NSLog(@"TAG== %d",  self.tag);

    NSDictionary *responseJson = [response JSONValue];

    NSError *error;

    JSONDecoder *jsonKitDecoder = [JSONDecoder decoderWithParseOptions:JKParseOptionValidFlags];

    NSDictionary *dictionary;
    if ([[jsonKitDecoder objectWithData:receivedData] valueForKey:@"d"])
    {
        dictionary = [[[jsonKitDecoder objectWithData:receivedData] valueForKey:@"d"] objectFromJSONString];
    }
    else
    {
        dictionary = [NSJSONSerialization JSONObjectWithData:receivedData options:kNilOptions | NSJSONReadingAllowFragments |NSJSONReadingMutableContainers error:&error];
    }

    //      NSLog(@"responseJson== %@",  [responseJson valueForKeyPath:@"data.WorkCell.label"]);

//    NSLog(@"%@",_delegate);

        if(_delegate){
            if ([_delegate respondsToSelector:@selector(requestFinished:withInfo:)]) {

                [_delegate requestFinished:self withInfo:dictionary];
                isRequest = FALSE;
            }
        }
    }

@protocol RequestDelegate <NSObject>

@optional
-(void)requestStarted:(Request *)request;
-(void)requestFailed:(Request *)request withError:(NSError *)error;

@required
-(void)requestFinished:(Request *)request withInfo:(NSDictionary *)info;

@end

Not perfect answer, but you can match by declaring a delegate in Connectivity.m class. Implement the methods of delegates in SignInViewController, by this way you can achieve this. Do not for get to assign the delegate to SignInViewController.

calling custom and delegate method from another class

1 Answers1