Returning NSDictionary from async code block? [duplicate] - objective-c

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Closed 10 years ago.
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returning UIImage from block
Hi I'm trying to return dictionary of json twitter data so i can use it in my application. How ever it is being called from a async block. I can not save it or return it any thoughts?
-(NSDictionary *)TweetFetcher
{
TWRequest *request = [[TWRequest alloc] initWithURL:
[NSURL URLWithString: #"http://search.twitter.com/search.json?
q=iOS%205&rpp=5&with_twitter_user_id=true&result_type=recent"] parameters:nil
requestMethod:TWRequestMethodGET];
[request performRequestWithHandler:^(NSData *responseData, NSHTTPURLResponse
*urlResponse,
NSError *error)
{
if ([urlResponse statusCode] == 200)
{
NSError *error;
NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:responseData
options:0 error:&error];
//resultsArray return an array [of dicitionaries<tweets>];
NSArray* resultsArray = [dict objectForKey:#"results"];
for (NSDictionary* internalDict in resultsArray)
NSLog([NSString stringWithFormat:#"%#", [internalDict
objectForKey:#"from_user_name"]]);
----> return dict; // i need this dictionary of json twitter data
}
else
NSLog(#"Twitter error, HTTP response: %i", [urlResponse statusCode]);
}];
}
Thnx in advance!

Answer 1

I feel like I've written a ton of this async code lately.
- (void)tweetFetcherWithCompletion:(void(^)(NSDictionary *dict, NSError *error))completion
{
NSURL *URL = [NSURL URLWithString:#"http://search.twitter.com/search.json?q=iOS%205&rpp=5&with_twitter_user_id=true&result_type=recent"];
TWRequest *request = [[TWRequest alloc] initWithURL:URL parameters:nil requestMethod:TWRequestMethodGET];
[request performRequestWithHandler:^(NSData *responseData, NSHTTPURLResponse *urlResponse, NSError *error) {
if ([urlResponse statusCode] == 200) {
NSError *error;
NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:responseData options:0 error:&error];
if (error) {
completion(nil, error);
return;
}
//resultsArray return an array [of dicitionaries<tweets>];
NSArray* resultsArray = [dict objectForKey:#"results"];
for (NSDictionary* internalDict in resultsArray)
NSLog(#"%#", [internalDict objectForKey:#"from_user_name"]);
completion(dict, nil);
}
else {
NSLog(#"Twitter error, HTTP response: %i", [urlResponse statusCode]);
completion(nil, error);
}
}];
}
So, instead of calling self.tweetDict = [self TweetFetcher];, you would call it this way.
[self tweetFetcherWithCompletion:^(NSDictionary *dict, NSError *error) {
if (error) {
// Handle Error Somehow
}
self.tweetDict = dict;
// Everything else you need to do with the dictionary.
}];