第16月第3天 AFURLSessionManager

1.

- (AFURLSessionManagerTaskDelegate *)delegateForTask:(NSURLSessionTask *)task {

    NSParameterAssert(task);

    AFURLSessionManagerTaskDelegate *delegate = nil;

    [self.lock lock];

    delegate = self.mutableTaskDelegatesKeyedByTaskIdentifier[@(task.taskIdentifier)];

    [self.lock unlock];

    return delegate;

}