Xcode汇总随笔

1. How to show line number?
   编辑时碰到的问题，想要看到line number
   Xcode -> preference -> Text Editing

2. How to add relative-path file to product directory?
   给OpenGL-first-program添加shader时碰到的问题，无法读取.vert, .frag
   考虑如下情况：

FILE file = fopen("file.txt", "rb");

此处file.txt不在product directory下，直接run会出现no such file
解决方法：Build Phases -> Copy Files -> Destination -> Product Directory 然后用 + 添加文件
Note: clear Subpath field, disable Copy only when installing