之前有在代码全部正确的情况下,遇到过下面的编译错误: fatal error: file '.....h' has been modified since the precompiled header '.....' was built. note: please rebuld precompiled header '....'. 解决方法是删除文件夹下/Users/username/Library/Developer/Xcode/DerivedData/ModuleCache下的所有文件,然后…