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POHow to wait then perform an action based on HTTPrequest response iOS
 

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  1. POHow to wait then perform an action based on HTTPrequest response iOS
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    <p>I have class that post a tweet to twitter using HTTP Post</p> <p>here is a bit of code <code>PostTweet.h</code></p> <pre><code>@interface PostTweet : NSObject - (void)postMyTweet; @end </code></pre> <p><code>PostTweet.m</code></p> <pre><code>- (void)postMyTweet { accountStore = [[ACAccountStore alloc] init]; accountType = [accountStore accountTypeWithAccountTypeIdentifier:ACAccountTypeIdentifierTwitter]; [accountStore requestAccessToAccountsWithType:accountType options:nil completion:^(BOOL granted, NSError *error) { if (granted) { allAccounts = [accountStore accountsWithAccountType:accountType]; if ([allAccounts count] &gt; 0) { userAccount = [allAccounts objectAtIndex:0]; userName = userAccount.username; NSURL * reqURL = [NSURL URLWithString:ENDPOINT_MEDIA_UPLOAD]; NSDictionary * parameter = [NSDictionary dictionaryWithObject:tweetTitle forKey:@"status"]; SLRequest *twitterInfoRequest = [SLRequest requestForServiceType:SLServiceTypeTwitter requestMethod:SLRequestMethodPOST URL:reqURL parameters:parameter]; [twitterInfoRequest addMultipartData:tweetImage withName:PARAM_MEDIA type:CONTENT_TYPE_MULTIPART_FORM_DATA filename:nil]; [twitterInfoRequest setAccount:userAccount]; [twitterInfoRequest performRequestWithHandler:^(NSData *responseData, NSHTTPURLResponse *urlResponse, NSError *error) { //show status after done long result = [urlResponse statusCode]; //Let us say that every thing is ok and I got 200 response if (result == 200) { NSLog(@"%ld",result); } } ]; } } else { NSLog(@"Not authorized"); } }]; } </code></pre> <p>In my <code>viewcontroller.m</code></p> <pre><code>- (void) actuallySendTweet { PostTweet * pt = [[PostTweet alloc] init]; [pt postTweet]; NSLog(@"Done"); } </code></pre> <p>The Question is: after calling The testMethod, How to wait for the http request response and I can do anything based on the response.</p> <p>What happens now is that as soon as I call the testMethod the <code>NSLog</code> perform right away and does not wait for the http response.</p>
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    1. COYou really don't want your main queue to wait for the network response. You should be doing whatever post-tweet action your want in your completion block (where you have that `NSLog(@"%ld", result);`). Effectively, in asynchronous programming, you should be separating the initiation of the request from the handling of the response from the server. If absolutely necessary, you can present some UI that tells the user that background stuff is happening (e.g. a view with a `UIActivityViewIndicator`), initiate the request, and have the completion block of `performRequestWithHandler` remove it.
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      1. USRob
    2. COThe technical answer is "do it in `performRequestWithHandler`", but if you're looking for less abstract answer, you have to give us a less abstract question. Namely, what precisely do you want to do after posting this tweet? It might be easier for us to make constructive suggestions if you tell us what you're trying to do.
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      1. USRob
    3. COI just want to show a completion message based on the http request result. For example if the result is 200, MBProgressHUD with success message will pop up(I know how to do this part). Other then 200, a failed messaged will pop up. @Rob
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