iOS / Swift 4：如何在不删除文件和文件夹现有目标的情况下复制包含多个包含文件的文件夹的文件夹？

Question

I would like to copy a folder containing several folders, and this folders contain several files. If this folders are existing, I would like to keep them inside, and overriding the files if existing. If the files doesn't exist, they are simply naturally added.

_ = try FileManager.default.replaceItemAt(previousItemUrl, withItemAt: currentItemUrl)

For example:

Files existing on device:

APP/XXX/a.txt
APP/XXX/b.txt
APP/XXX/c.txt
APP/YYY/d.txt
APP/ZZZ/e.txt
APP/ZZZ/f.txt

Files to copy:

APP/XXX/c.txt //Will override
APP/YYY/g.txt //new file added
APP/ZZZ/h.txt //new file added
APP/AAA       //new folder added

Do I have to create my self a recursive function, or did that function already exists natively?

Thanks in advance.

Answer 1

We can use below native method. It copies the source to destination.

func copyItem(atPath srcPath: String, 
   toPath dstPath: String) throws

We can also control the override use case by implementing other delegate methods mentioned below.

optional func fileManager(_ fileManager: FileManager, 
         shouldCopyItemAt srcURL: URL, 
                       to dstURL: URL) -> Bool

You can find all these details in Apple document