当我
Logger *logger = [Logger new];
NSURL *url = [NSURL URLWithString:@"http://www.google.com"];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
__unused NSURLConnection *conn = [[NSURLConnection alloc]
initWithRequest:request delegate:logger startImmediately:YES];
... 没发生什么事。直到 i 才调用委托方法
[[NSRunLoop currentRunLoop]run];
我原以为startImmediately:YES
会这样做。