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

I think what you're looking for is the NSFileManagerDelegate protocol method:

- (BOOL)fileManager:(NSFileManager *)fileManager shouldProceedAfterError:(NSError *)error copyingItemAtPath:(NSString *)srcPath toPath:(NSString *)dstPath;

From this method, you can decide what to do with the existing file (rename/delete) and then proceed with the copy.

Answer 2

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
        }
    }
}

Answer 3

I think the possibility of the nanosecond you mensioned is feeble. so stick to the first method of removing the existing file and copying the new file.

Answer 4

This is for improvement of 'Swift 3 and above' of question 'Move file and override [duplicate]' which is marked duplicate of this question.

To move file from sourcepath(string) to DestinationPath(string). Delete the existing file if same name file already exists at DestinationPath.

// Set the correct path in string in 'let' variables.
let destinationStringPath = ""
let sourceStringPath = ""

let fileManager:FileManager = FileManager.default
do
{
    try fileManager.removeItem(atPath: sourceStringPath)
}
catch
{
}

do
{
    try fileManager.moveItem(atPath: sourceStringPath, toPath: destinationStringPath)
}
catch
{
}

Answer 5

For overwriting files, I prefer

NSData *imgDta = UIImageJPEGRepresentation(tImg, 1.0);

[imgDta writeToFile:targetPath options:NSDataWritingFileProtectionNone error:&err];

Removing & copying files in loop sometimes doesn't work as intended

Answer 6

Swift4:

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