如何优化目录列表?(枚举器路径和递归调用contentsOfDirectoryAtPath)

I wrote a method(getDirTree1) that makes listing all directories from the root, using the recommended class NSDirectoryEnumerator and method nextObject. But while it was running unacceptably used a lot of memory (mainly private class NSPathStore2):I wrote a method(getDirTree1) that makes listin