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POMethod BOOL return from inside block
 

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    <p>I'm trying to add Beeblex's new In App Purchase verification to my app, however i'm struggling passing a return value from within a block.</p> <p>Here's the code I have now, and as you can see I set a BOOL value, then within the verification block I set the BOOL and return it at the end. However the return at the end is called before the block finishes, so what I need is to return the BOOL from within the block?</p> <pre><code>- (BOOL)verifyTransaction:(SKPaymentTransaction *)transaction { if (![BBXIAPTransaction canValidateTransactions]) { return YES; // There is no connectivity to reach the server } BOOL __block toReturn = YES; BBXIAPTransaction *bbxTransaction = [[BBXIAPTransaction alloc] initWithTransaction:transaction]; bbxTransaction.useSandbox = YES; [bbxTransaction validateWithCompletionBlock:^(NSError *error) { if (bbxTransaction.transactionVerified) { if (bbxTransaction.transactionIsDuplicate) { // The transaction is valid, but duplicate - it has already been sent to Beeblex in the past. NSLog(@"Transaction is a duplicate!"); [FlurryAnalytics logEvent:@"Transaction duplicate!"]; toReturn = NO; } else { // The transaction has been successfully validated and is unique NSLog(@"Transaction valid data:%@",bbxTransaction.validatedTransactionData); [FlurryAnalytics logEvent:@"Transaction verified"]; toReturn = YES; } } else { // Check whether this is a validation error, or if something went wrong with Beeblex if (bbxTransaction.hasConfigurationError || bbxTransaction.hasServerError || bbxTransaction.hasClientError) { // The error was not caused by a problem with the data, but is most likely due to some transient networking issues NSLog(@"Transaction error caused by network, not data"); [FlurryAnalytics logEvent:@"Transaction network error"]; toReturn = YES; } else { // The transaction supplied to the validation service was not valid according to Apple NSLog(@"Transaction not valid according to Apple"); [FlurryAnalytics logEvent:@"Transaction invalid!!"]; toReturn = NO; } } }]; NSLog(@"toReturn: %@",toReturn ? @"Yes" : @"No"); return toReturn; } </code></pre> <p>If I simply put <code>return = NO;</code> inside the block, I get compiler warnings of Incompatible block pointer types, and control may reach end of non-void block.</p>
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    1. COit is a weird thing, because the blocks are not synchronised with the methods, therefore no matter what value you want to set for the `toReturn` variable inside the block, the method does not take care of it, it sends back the current `toReturn` value what it has when the thread pool runs the `return toReturn;` line.
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    2. COYou are trying to convert an asynchronous API into synchronous, a wrong thing to do. Rather than returning `BOOL`, your code should take a completion block or a delegate of its own, an call back the caller when transaction completes. Making the API synchronous would make your application less responsive.
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    3. COYes I guess that makes sense, i'm trying to make async into sync which is not good. In that case I could just use [self successMethod] and [self failMethod] inside the block to call separate methods. Thanks
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