Objective-C issue with connectionDidFinishLoading and Delegate - objective-c

Question

Am trying to use an API class to fetch data from a URL and then have that data returned to a method inside the ViewController. I have the ViewController call the API method.
Have tried several places on SO already and come up with the following, but it is not working and as an Objective-C noobie have tried reading documentation and such but still not understanding what could be going wrong.
I have a viewcontroller calling an method 'fetch' inside a class 'api'.
I have the connection delegates inside api class and it works ok (correct data is printed inside connectionDidFinishLoading method).
I need a delegate to return the data to a method inside the viewcontroller class.
So far I have
ViewController.h
#import "Api.h"
#interface ViewController : UIViewController <apiDelegate>{
}
- (void)apiSucceeded:(NSString *)jsonString;
- (void)apiFailed:(NSString *)failedMessage;
#end
ViewController.m
#import "ViewController.h"
#import "Api.h"
- (void)apiSucceeded:(NSString *)jsonString {
NSLog(#"WORKED");
}
- (void)apiFailed:(NSString *)failedMessage {
NSLog(#"FAILED");
}
- (void)viewDidLoad {
[super viewDidLoad];
Api* myapi = [[Api alloc]init];
[myapi fetch];
}
#end
Api.h
#protocol apiDelegate
#required
- (void)apiSucceeded:(NSString *)jsonString;
- (void)apiFailed:(NSString *)failedMessage;
#end
#interface Api : NSObject {
id _delegate;
}
#property (nonatomic, assign) id _delegate;
-(void)fetch;
#end
Api.m
#import "Api.h"
#import "ViewController.h"
#synthesize _delegate;
- (void)fetch{
//connection setup....
[NSURLConnection connectionWithRequest:[request autorelease] delegate:self];
}
-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
[self.receivedData setLength: 0];
}
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
// NSLog(#"append data");
[self.receivedData appendData:data];
// NSLog(#"Bytes: %d", [receivedData length]);
}
-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
//TODO error handling for connection
if ([_delegate respondsToSelector:#selector(apiFailed:)]) {
[_delegate apiFailed:[error localizedDescription]];
}
NSLog(#"Cannot Connect");
}
-(void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSLog(#"DONE. Received Bytes: %d", [self.receivedData length]);
NSString *jsonString = [[NSString alloc] initWithBytes: [receivedData mutableBytes] length:[receivedData length] encoding:NSUTF8StringEncoding];
if ([_delegate respondsToSelector:#selector(apiSucceeded:)]) {
[_delegate apiSucceeded:jsonString];
}
}
#end
There is no error but it just does not run 'apiSucceeded' method.
Please dont misunderstand this as a question regarding 'connectionDidFinishLoading'. That bit works well, its the handing of the data BACK to a ViewController that is causing issues.
Can anybody see what I have done wrong please?

Answer 1

I seems that you forgot to set
myapi.delegate = self;
after
Api* myapi = [[Api alloc]init];