使用Swift从文本文件中删除一行

let fileManager = FileManager.default
let filePath = "/path/to/file.txt"

guard let fileData = fileManager.contents(atPath: filePath) else {
    print("Failed to read file")
    return
}

guard let fileString = String(data: fileData, encoding: .utf8) else {
    print("Failed to convert file data to string")
    return
}

var lines = fileString.components(separatedBy: .newlines)
let lineIndexToRemove = 2 // 要删除的行号，从0开始计数

if lineIndexToRemove >= 0 && lineIndexToRemove < lines.count {
    lines.remove(at: lineIndexToRemove)
} else {
    print("Invalid line index")
    return
}

let modifiedFileString = lines.joined(separator: "\n")

do {
    try modifiedFileString.write(toFile: filePath, atomically: true, encoding: .utf8)
    print("Line removed successfully")
} catch {
    print("Failed to write modified content to file: \(error)")
}