AFNetworking waitUntilFinished是否会阻塞UI线程？谢谢

AFNetworking waitUntilFinished会阻塞UI线程吗？谢谢你。AFNetworking waitUntilFinished会不会阻塞UI线程？谢谢介绍:+(ns data *)postdata:(ns dictionary *)dict URL:(ns string *)URL { ns data * data =[NSJSONSerialization