Чтобы очистить текстовый файл в Swift, вы можете использовать несколько разных методов. Вот несколько примеров:

Метод 1: использование FileManager

func clearTextFileUsingFileManager(filePath: String) {
    let fileManager = FileManager.default
    do {
        try "".write(toFile: filePath, atomically: true, encoding: .utf8)
        print("Text file cleared successfully.")
    } catch {
        print("Error occurred while clearing the text file: \(error)")
    }
}

Метод 2: использование FileHandle

func clearTextFileUsingFileHandle(filePath: String) {
    let fileHandle = FileHandle(forWritingAtPath: filePath)
    fileHandle?.truncateFile(atOffset: 0)
    fileHandle?.closeFile()
    print("Text file cleared successfully.")
}

Метод 3. Использование данных

func clearTextFileUsingData(filePath: String) {
    let emptyData = Data()
    do {
        try emptyData.write(to: URL(fileURLWithPath: filePath))
        print("Text file cleared successfully.")
    } catch {
        print("Error occurred while clearing the text file: \(error)")
    }
}

Метод 4: использование OutputStream

func clearTextFileUsingOutputStream(filePath: String) {
    if let outputStream = OutputStream(toFileAtPath: filePath, append: false) {
        outputStream.open()
        outputStream.write(Array<UInt8>())
        outputStream.close()
        print("Text file cleared successfully.")
    } else {
        print("Error occurred while clearing the text file.")
    }
}