在iOS应用程序中返回JSON

Question

I'm trying to return a simple JSON in my iOS app through PHP file.

PHP:

<?php
header('Content-Type: application/json');
$myarray = array("io" => 1, "tu" => 2);
$out = json_encode($myarray);

echo $out;

?>

iOS:

-(void)provePHP{

    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
    [request setURL:[NSURL URLWithString:@"http://mysite/myphpfile.php"]];
    [request setValue:@"application/json" forHTTPHeaderField:@"Accept"];
    [request setValue:@"application/json"forHTTPHeaderField:@"Content-Type"];

    NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
    [connection start];
}

- (void)connection:(NSURLConnection *)connection
    didReceiveData:(NSData *)data{

    NSError *error;

    NSDictionary *jsonDict = [NSJSONSerialization JSONObjectWithData: data options: NSJSONReadingMutableContainers error: &error];

    NSLog(@"%@ - %@", jsonDict, error);

}


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

    NSLog(@"FINISH");
}

- (void)connection:(NSURLConnection *)connection
  didFailWithError:(NSError *)error{

    NSLog(@"Error");
}

I don't understand what I do wrong. I follow a lot of code I found on this site but no results in log.

Answer 1

connection:didReceiveData: can be called multiple times in a connection. You should have an NSMutableData property that you keep appending data to in connection:didReceiveData: , then work with the data once it is all there in connectionDidFinishLoading .

I'd suggest adjusting your code to follow those guidelines and seeing if you still have the problem.

---

EDIT
If you are not getting the logs at all, you haven't properly set your class as the NSURLConnectionDelegate . See the docs for information on what the delegate pattern is and how to make your class the delegate of a framework class in Objective-C.