Objective C ASIHTTPRequest nested GCD block in complete block
- by T.Leavy
I was wondering if this is the correct way to have nested blocks working on the same variable in Objective C without causing any memory problems or crashes with ARC. It starts with a ASIHttpRequest complete block.
MyObject *object = [dataSet objectAtIndex:i];
ASIHTTPRequest *request = [[ASIHTTPRequest alloc]initWithURL:@"FOO"];
__block MyObject *mutableObject = object;
[request setCompleteBlock:^{
mutableObject.data = request.responseData;
__block MyObject *gcdMutableObject = mutableObject;
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,0),^{
[gcdMutableObject doLongComputation];
dispatch_async(dispatch_get_main_queue(),^{
[self updateGUIWithObject:gcdMutableObject];
});
});
[request startAsynchronous];
My main concern is nesting the dispatch queues and using the __block version of the previous queue to access data. Is what I am doing safe?
