解决方法是点击工程，在targets界面中找到Build Phases，根据提示信息“XXX”来判断缺少什么文件，一般如果缺少自定义的文件，XXX会是缺少的类名，那么就在Complie Sources中加入该文件。如果缺少类库，则在Link Binary With Libraries中加入该类库。

一般加入其.m的文件

如果运行还是报错的话

把文件删除，remove reference 删除引用，然后再从finder中拖进来

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