Trying to set delegate method to get urlConnection data

Question

I went around and around, I tried to use this example , but ran into a problem in the delegate method. I am trying to figure out how to close this. It looks like I'm set up correctly, but you need help in the last step:

I get - [ThirdTab apiFinished:]: an unrecognized selector sent to the instance.

On line 2, WebServiceAPI.m: self.aDelegate = aDelegate gives me an error: 2) The local aDelegate declaration hides the instance variable.

This is my first approach using delegates who cannot understand this error.

Thank.

This is in my third type of UITableViewController:

 -(void)viewDidLoad {
      [super viewDidLoad];
      WebServiceAPI *api = [[WebServiceAPI alloc] init];;   
      api.delegate =self;
          [api DataRequest:data3 delegate:self];

  // this is where I'm trying to connect data3 to my tableview.
        self.tableDataSource3 = [data3 objectForKey:@"Rows"];
            self.webApi = api;
        [api release];

This is WebServiceAPI.h:

#import <UIKit/UIKit.h>

@class WebServiceAPI;
@protocol WebServiceAPIDelegate;

@interface WebServiceAPI : NSObject
{ 
    id<WebServiceAPIDelegate>aDelegate;
    NSDictionary *data3;
    NSArray *rowsArrayFamily;
    NSMutableData *receivedData;
    NSString *jsonreturnFF;


 }
 @property (nonatomic, assign) id<WebServiceAPIDelegate>aDelegate;
 @property (nonatomic, retain) NSDictionary *data3;
 @property (retain,nonatomic) NSArray *rowsArrayFamily;
 @property (nonatomic, retain) NSMutableData *receivedData;
 @property (nonatomic, retain) NSString *jsonreturnFF;

 - (void) DataRequest: (id) aDelegate;
 @end

 @protocol WebServiceAPIDelegate
 @required
   -(void)apiFinished:(WebServiceAPI*)api;
   -(void)api:(WebServiceAPI*)api failedWithError:(NSError*)error;
  @end

Here is WebServiceAPI.m where I have a problem:

- (void) DataRequest:data3 delegate:(id) aDelegate; {
      self.aDelegate = aDelegate;

        NSUserDefaults *defaultsF = [NSUserDefaults standardUserDefaults];
        NSString *useridFF = [defaultsF objectForKey:kUseridKey];

    NSString *urlstrF = [[NSString alloc] initWithFormat:@"http://www.~.php?userid=%@",useridFF];
    NSURLRequest *req3 =[NSURLRequest requestWithURL:[NSURL URLWithString:urlstrF]];
    NSURLConnection *conn3 = [[NSURLConnection alloc] initWithRequest:req3 delegate:self];

    NSMutableData *data =[[NSMutableData alloc] init];
    self.receivedData = data;   
 // self.connection = conn3;
 }

Answer 1

WebService.h :

@property (nonatomic, assign) id<WebServiceAPIDelegate>aDelegate;

WebService.m :

self.delegate = aDelegate;

WebService.h, WebService.m.