如何在swift 5中的documents目录中写入CSV文件的新行？

guard let documentsDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first else {
    // 处理获取路径失败的情况
    return
}

let fileURL = documentsDirectory.appendingPathComponent("data.csv")

let newRow = "Value1,Value2,Value3"

do {
    let fileHandle = try FileHandle(forWritingTo: fileURL)
    fileHandle.seekToEndOfFile()
    fileHandle.write(newRow.data(using: .utf8)!)
    fileHandle.closeFile()
} catch {
    // 处理写入失败的情况
}

guard let documentsDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first else {
    // 处理获取路径失败的情况
    return
}

let fileURL = documentsDirectory.appendingPathComponent("data.csv")
let newRow = "Value1,Value2,Value3"

do {
    let fileHandle = try FileHandle(forWritingTo: fileURL)
    fileHandle.seekToEndOfFile()
    fileHandle.write(newRow.data(using: .utf8)!)
    fileHandle.closeFile()
} catch {
    // 处理写入失败的情况
}