| path | 文件的物理路径。 |
| sourceTree | 源树路径是相对于的。不支持 PBXSourceTree.Group 树。 |
string 如果搜索成功，则为文件的 GUID，否则为 null。
查找项目中具有给定物理路径的文件（如果有）。
没有源树参数的版本匹配所有已知文件的路径。谨慎使用此重载。
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