How to overwrite a file with NSFileManager when copying?

Question

I\'m using this method to copy a file:

[fileManager copyItemAtPath:sourcePath toPath:targetPath error:&error];

I want to overwrite a fi

Answer 1

Detect file exists error, delete the destination file and copy again.

Sample code in Swift 2.0:

class MainWindowController: NSFileManagerDelegate {

    let fileManager = NSFileManager()

    override func windowDidLoad() {
        super.windowDidLoad()
        fileManager.delegate = self
        do {
            try fileManager.copyItemAtPath(srcPath, toPath: dstPath)
        } catch {
            print("File already exists at \'\(srcPath)\':\n\((error as NSError).description)")
        }
    }

    func fileManager(fileManager: NSFileManager, shouldProceedAfterError error: NSError, copyingItemAtPath srcPath: String, toPath dstPath: String) -> Bool {
        if error.code == NSFileWriteFileExistsError {
            do {
                try fileManager.removeItemAtPath(dstPath)
                print("Existing file deleted.")
            } catch {
                print("Failed to delete existing file:\n\((error as NSError).description)")
            }
            do {
                try fileManager.copyItemAtPath(srcPath, toPath: dstPath)
                print("File saved.")
            } catch {
                print("File not saved:\n\((error as NSError).description)")
            }
            return true
        } else {
            return false
        }
    }
}