| path | 文件的物理路径。 |
| sourceTree | 路径相对的源代码树。PBXSourceTree.Group 树不受支持。 |
string 如果搜索成功，则返回文件的 GUID，否则返回 null。
在项目中查找具有给定物理路径的文件（如果有）。
不包含源代码树参数的版本会与所有已知文件的路径进行匹配。请小心使用此重载。
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