今天突然好奇 oneway void 到底是個(gè)神馬東東，然后就開始查
- (oneway void)release OBJC_ARC_UNAVAILABLE;~~~
把 oneway void 寫成 void兄淫，就得到了如下的警告：
改回來 - (oneway void)release 之后屯远，警告消失，??是這樣說的：oneway is used with the distributed objects API, which allows use of objective-c objects between different threads or applications. It tells the system that it should not block the calling thread until the method returns. Without it, the caller will block, even though the method's return type is void. Obviously, it is never used with anything other than void, as doing so would mean the method returns something, but the caller doesn't get it. 