参考文章:http://www.cnblogs.com/cpcpc/archive/2012/08/21/2649264.html,但是发现同样的方法在xcode 4.6已经不行了,实例化对象时会报:
“Receiver type for instance messages is a forward declaration”的错误。即使将"@class Hello;" 改为#import "Hello.h"也还是会在NewHello上报"Unkwon
type class,did you mean Class" 的错误。
于是上stackoverflow里提了个问题(http://t.cn/
The solution is to add
#import "Hello.h"
to your ViewController.m file and change the file type of ViewController.m to Obj-C++ (from the right panel)
折腾半天的问题到此终于解决。