2015-10-28 16:31:40.478 attendance[10644:128666] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<__NSDictionaryI 0x7fe0e047d340> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key pstype.'
錯誤如上，意思是該字典沒有這個鍵，異常拋出是在這，
[socket.writeData setValue:@(20152)
forKey:@"pstype"];
socket.writeData是可變的字典，添加新的鍵值時需要進行內存分配，最終如下解決
socket.writeData=[NSMutableDictionary dictionaryWithCapacity:10];
[socket.writeData setValue:@(20152)
forKey:@"pstype"];
