Application crash when using sendAsynchronously with RKRequest - objective-c

Question

I want to use Restkit to download a file asynchronously. However the application crash when sendAsynchronously method was used. If I used sendSynchronously instead of sendAsynchronously, it didn't crash. Is there anybody know why?
Here is my code
NSString *passURL = #"https://s3.amazonaws.com/mheydt-mhtnd/2012-03-13-1.png";
RKRequest *request = [RKRequest requestWithURL:[NSURL URLWithString: passURL]];
request.delegate = self;
[request sendAsynchronously];
- (void)request:(RKRequest *)request didReceiveResponse:(RKResponse *)response {
NSLog(#"didReceiveResponse");
}
- (void)request:(RKRequest *)request didLoadResponse:(RKResponse *)response {
NSLog(#"didLoadResponse");
}
Thank you very much!

Answer 1

When using sendAsynchronously in this way, the request is not retained. You would better use the send method which adds the request in an instance of RKRequestQueue (which prevents the request to be freed too soon):
[request send];
Or, you can strongly reference the request by yourself. Your code would become:
#interface MyClass
{
RKRequest *request;
}
We assume that this is a strong reference. And in the implementation, you would have:
#implementation MyClass
- (void)sendTheRequest
{
NSString *passURL = #"https://s3.amazonaws.com/mheydt-mhtnd/2012-03-13-1.png";
request = [RKRequest requestWithURL:[NSURL URLWithString: passURL]];
request.delegate = self;
[request sendAsynchronously];
}
- (void)request:(RKRequest *)request didReceiveResponse:(RKResponse *)response {
NSLog(#"didReceiveResponse");
request = nil;
}
- (void)request:(RKRequest *)request didLoadResponse:(RKResponse *)response {
NSLog(#"didLoadResponse");
request = nil;
}
- (void)request:(RKRequest *)request didFailLoadWithError:(NSError *)error {
NSLog(#"didFailLoadWithError");
request = nil;
}
#end