Swift中如何处理文件I/O操作

在Swift中，处理文件I/O操作主要使用Foundation框架中的FileManager和FileHandle类。以下是一些基本的文件I/O操作示例：

1. 读取文件内容：

import Foundation

let fileManager = FileManager.default
let filePath = Bundle.main.path(forResource: "example", ofType: "txt")!

do {
    let fileContents = try String(contentsOfFile: filePath, encoding: .utf8)
    print(fileContents)
} catch {
    print("Error reading file: \(error)")
}

2. 写入文件内容：

import Foundation

let fileManager = FileManager.default
let filePath = Bundle.main.path(forResource: "example", ofType: "txt")!
let contentToWrite = "Hello, World!"

do {
    try contentToWrite.write(toFile: filePath, atomically: true, encoding: .utf8)
    print("Successfully wrote to file.")
} catch {
    print("Error writing file: \(error)")
}

3. 追加内容到文件：

import Foundation

let fileManager = FileManager.default
let filePath = Bundle.main.path(forResource: "example", ofType: "txt")!
let contentToAppend = "\nThis is a new line."

do {
    let fileHandle = try FileHandle(forUpdatingAtPath: filePath)
    fileHandle.seek(toEndOfFile)
    fileHandle.write(contentToAppend.data(using: .utf8)!)
    fileHandle.closeFile()
    print("Successfully appended to file.")
} catch {
    print("Error appending to file: \(error)")
}

这些示例展示了如何在Swift中执行基本的文件I/O操作，包括读取、写入和追加内容。在实际应用中，你可能需要根据具体需求对这些示例进行调整。