Using iOS 5's new TWRequest API, I've ran into a brick wall related with block usage.
What I need to do is upon receiving a successful response to a first request, immediately fire another one. On the completion block of the second request, I then notify success or failure of the multi-step operation.
Here's roughly what I'm doing:
- (void)doRequests
{
TWRequest* firstRequest = [self createFirstRequest];
[firstRequest performRequestWithHandler:^(NSData* responseData,
NSHTTPURLResponse* response,
NSError* error) {
// Error handling hidden for the sake of brevity...
TWRequest* secondRequest = [self createSecondRequest];
[secondRequest performRequestWithHandler:^(NSData* a,
NSHTTPURLResponse* b,
NSError* c) {
// Notify of success or failure - never reaches this far
}];
}];
}
I am not retaining either of the requests or keeping a reference to them anywhere; it's just fire-and-forget.
However, when I run the app, it crashes with EXC_BAD_ACCESS on:
[secondRequest performRequestWithHandler:...];
It executes the first request just fine, but when I try to launch a second one with a handler, it crashes. What's wrong with that code?
The methods to create the requests are as simple as:
- (TWRequest*)createFirstRequest
{
NSString* target = @"
https://api.twitter.com/1/statuses/home_timeline.json";
NSURL* url = [NSURL URLWithString:target];
TWRequest* request = [[TWRequest alloc]
initWithURL:url parameters:params
requestMethod:TWRequestMethodGET];
// _twitterAccount is the backing ivar for property 'twitterAccount',
// a strong & nonatomic property of type ACAccount*
request.account = _twitterAccount;
return request;
}
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